Aussie Pumps Australian Pump Industries - Ferret

Australian Pump Industries (02) 8865 3500 

Who is Tsurumi ? 

, Established in 1924, Tsurumi is one of the world’s most experienced pump 

manufacturers 

, Tsurumi first started producing submersible pumps in 1953 and through an 

ongoing and extensive research and development programme, has produced 

many innovations in submersible pump design. 

, Tsurumi’s Kyoto Plant is the world’s most modern submersible pump 

manufacturing plant - total manufacturing capability: 1,000,000 units per 

year. Testing facilities with capability testing of large pumps up to 3.000 mm 

discharge bore. 

, Tsurumi produces more submersible pumps per year than any other 

submersible pump manufacturer in the world (500,000 units per year). 

, Tsurumi offers over 1800 different models of submersible pumps 

, Size range: 25 mm to 2250 mm 

Submersible sewage & industrial pumps 

, Power range: 0.15 kW to 300 kW 

, Flow range: 0.02 m 3/min to 330 m 3/min 

, Types of submersible pumps produced: 

Semi-Vortex, Vortex, Non Clog, Cutter, Mixed Flow, Axial Flow, Radial 

Flow, Contractor & Dewatering, Sewage & Wastewater, Aerators & 

Blowers, Decanting Units, Scum Skimmers. 

, Established dealer network in Europe, North and South America, Asia, 

Australia and parts of Africa. 

At Tsurumi there is only one level of quality - the best 

p 2

CONTENTS 

1. Introduction·········································································································································································· 2 

2. Comparison of Aeration System/Equipment·········································································································· 2 

3. Fluid to be Handled and Standard Specifications of TRN-series Aerators 

3-1 Fluid to be Handled ··············································································································································· 3 

3-2 Standard Specifications of TRN-series Aerators - 50Hz ····································································· 3 

3-3 Standard Specifications of TRN-series Aerators - 60Hz ····································································· 3 

4. Shape and Dimension of Aeration Tank 

4-1 Typical Convection Pattern································································································································ 4 

4-2 Shape of Aeration Tanks ····································································································································· 4 

4-3 Recommended Tank Dimensions (Standard) ······························································································· 4 

4-4 Notes to the Case that Two or More Aerators are to be installed in a Tank································ 5 

5. Aerator with Optional Stand or Draft Tube············································································································ 6 

5-1 Recommended Tank Dimensions (with Stand or Draft Tube)······························································· 6 

6. Oxygen Transfer Rate ····················································································································································· 7 

6-1 Oxygen Transfer Rate Test Result ·············································································································· 7 

6-2 Oxygen Transfer Rate vs. Water Depth Curve - 50Hz ······································································ 8 

6-3 Oxygen Transfer Rate vs. Water Depth Curve - 60Hz ····································································9 

7. Operation System 

7-1 Reduced Speed Operation by Variable Frequency Drive (VFD) ························································10 

7-1-1 Comparisons in the Method of Adjustment ······················································································10 

7-1-2 Comparisons in Adjustment Range (for reference only)······························································10 

7-1-3 Characteristics of Reduced Speed Operation by VFD (for reference only)························10 

7-2 Operation in combination with Blower··········································································································11 

7-2-1 Comparison against Other Deep Aeration Methods (in case the tank depth is 10m)·············11 

7-2-2 Equipment necessary for this Operation ···························································································12 

7-2-3 Operation························································································································································13 

7-2-4 Adjusting Procedure for Air Flow Rate (e.g. 200V, 50Hz)···························································13 

7-2-5 Selection Procedure (Example) ············································································································· 14 

7-2-6 Recommended Tank Dimensions (combination with blower)·····················································14 

7-2-7 Initially Targeted Operating Point of Blower and 

7-2-7 Operating Range of Aerator on Running Current (combination with blower - 50Hz) ··············15 

7-2-8 Initially Targeted Operating Point of Blower and 

7-2-7 Operating Range of Aerator on Running Current (combination with blower - 60Hz) ··············15 

7-2-9 Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 50Hz)·················16 

7-2-10 Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 60Hz)···············17 

7-2-11 Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz)················ 18 

7-2-12 Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 60Hz)················ 19 

8. About Noise········································································································································································· 20 

8-1 Measured Point and Condition··························································································································· 20 

8-2 Measured Sound Pressure Level Data··········································································································· 20 

1 

Australian Pump Industries (02) 8865 3500

1. Introduction 

The TRN aerator employs a special impeller that draws air by its self-aspiration force, and the air sucked down 

into the aerator is subjected to an air/water collision within the guide vane, and then this mixed air-water current 

is forcibly discharged through the discharge outlets. This aerator is excellent in durability by its unique “air seal” 

system and has a superior maintainability in spite of its simple structure. 

2. Comparison of Aeration System/Equipment 

Submersible 

Aerator 

(TRN-series) 

Air (Self-aspiration) 

aa 

Submersible Air 

Fine Bubble Aeration (✳) 

Mixer (TAR-series) 

(+ Rotary Blower, 

Line Aeration Method 

Full Aeration 

Method 

RSR) Plate Diffuser Tube Diffuser Plate Diffuser 

Air 

Holder 

General 

Description 

A special impeller 

for a self-aspiration 

force draws air 

without blower, and 

the air sucked down 

into the water is 

subjected to an 

air/water collision 

within the guide 

vane, and then 

With the combination 

of a blower, 

high-efficient oxygen 

transferring and 

mixing is possible by 

the high efficiency 

impeller and the 

four-direction 

discharge; This can 

It consists of 

plate-shape 

diffusers formed by 

uniformly sized 

ceramic particles or 

porous resin. 

It consists of 

cylindrical diffusers 

formed by uniformly 

sized ceramic 

particles or porous 

resin. 

It is formed by 

uniformly sized 

ceramic particles or 

by porous resin 

plates. It is 

smaller than the 

line aeration 

method diffusers, 

and the 

this mixed 

air-water current 

is forcibly 

discharged through 

the discharge 

outlets. 

be used for either 

anaerobic or aerobic 

treatment. 

bubbles are finer 

than the plate 

diffuser or tube 

diffuser. 

Material 

(Diffuser Part) 

Oxygen 

Transfer 

Stainless Steel 

(Impeller) 

Stainless Steel 

(Discharge Part of 

the Air-supply Pipe) 

Ceramic or 

Synthetic Resin 

Efficiency 

(Clean Water / 

Water Depth : 

5m) 

17 to 23% 20 to 30% 14 to 16% 20 to 32% 

Intermittent 

Operation 

Possible 

Impossible 

Need for a Unnecessary 

Blower or Air 

Piping 

(Air-inlet Pipe and 

Silencer needed) 

Necessary 

Overhaul 

Simple structure, 

same as the 

submersible pumps, 

makes it easy for 

When maintenance is 

required, it should be 

taken to the factory 

because of built-in 

Necessary to drain 

sewage water from 

the tank 

maintenance. 

It is possible to be 

reduction gears. 

Controllability 

controlled by a VFD 

to some extent. 

(See p.10 7-1. 

Reduced Speed 

Operation by VFD) 

Well-controllable 

no limit of air flow 

rate 

Highly efficient in 

Less Controllable 

Minimum air flow rate 

has been determined 

oxygen transfer rate 

Other 

Well-durability 

by the air seal 

per unit of electric 

power. Can be used 

for anaerobic 

aeration. 

Aging increase 

in pressure loss 

✳ Cited Reference: “Guideline and Manual for Planning and Design in Sewerage Systems (2001)” issued by Japan Sewerage Works 

Association 

(Oxygen transfer efficiencies of the TRN-series are those calculated from the oxygen transfer rate at 5 meter’s depth on the curves of 

6-2. and 6-3. “Oxygen Transfer Rate vs. Water Depth Curve” on pages 8 and 9 and the inhaled air flow rate, for the models that have the 

maximum water depth of 6 meters.) 

2 

Air 

Diffuse 

Air 

Air 

Air 


Air

3. Fluid to be Handled and Standard Specifications of TRN-series Aerators 

■ 3-1. Fluid to be Handled 

Type of Liquid 

Temperature 

[ o C] 

Liquid to be Handled 

Chlorine Ion 

pH 

Concentration 

[mg/l] 

3 

Electrical Conductivity 

[μS/cm] 

Wastewater & sewage 0 to 40 5 to 9 Below 1000 Below 1000 

Caution 

■ 3-2. Standard Specifications of TRN-series Aerators - 50Hz 

Air- 

inlet 

Bore 

[mm] 

Model 

Motor 

Output 

[kW] 

Starting 

Method 

Max 

Water 

Depth 

(MWD) 

[m] 

Air 

Flow Rate 

- MWD 

[m 3 /h]-[m] 

No. of 

Outlets 

Impeller 

Passage 

[mm] 

Mass 

(Weight) 

[kg] 

Material 

Gas to be Handled 

(Suction through 

the air-inlet pipe) 

Should not be 

inflammable, 

corrosive, or toxic 

Cabtyre Cable 

32 

32TRN2.75-52 

32TRN21.5-52 

0.75 

1.5 

D.O.L 

D.O.L 

3.5 

3.5 

7 – 3.5 

20 – 3.5 

6 

6 

10 

12 

55 

55 

PVC 

PVC 

4x 1.25 

4x 1.25 

11.1 

11.1 

6 

6 

50TRN42.2-52 2.2 D.O.L 3.6 39 – 3.6 6 12 140 PVC 4 x 2 11.8 6 

50 50TRN43.7-52 3.7 D.O.L 4 55 – 4 6 12 150 PVC 4 x 2 11.8 6 

50TRN45.5-52 5.5 D.O.L 4 78 – 4 6 15 170 CR 4 x 3.5 14.1 8 

80TRN47.5-52 7.5 D.O.L 4.5 124 – 4.5 6 15 190 CR 4 x 5.5 16.8 8 

4 x 3.5 14.1 

80 

80TRN412-52 12 Star-Delta 6 157 – 6 6 15 200 CR 3 x 3.5 

2x 1.25 

12.9 

10.5 

8 

4 x 5.5 16.8 

80TRN417-52 17 Star-Delta 6 202 - 6 6 15 220 CR 3 x 5.5 15.2 8 

2x 1.25 10.5 

4 x 14 21.7 

100 100TRN424-52 24 Star-Delta 6 388 - 6 8 22 460 CR 3 x 14 19.7 10 

2x 1.25 10.5 

4 x 14 21.7 

150 150TRN440-52 40 Star-Delta 6 528 - 6 8 25 635 CR 3 x 14 19.7 10 

2x 1.25 10.5 

■ 3-3. Standard Specifications of TRN-series Aerators - 60Hz 

Air- 

inlet 

Bore 

[mm] 

● We assume no responsibility for any damages resulting from solids that enter even through the air-inlet pipe. 

● We do not indemnify for any secondary, consequential or incidental damages caused by a fault of the TRN aerator. 

Model 

Motor 

Output 

[kW] 

Starting 

Method 

Max 

Water 

Depth 

(MWD) 

[m] 

Air 

Flow Rate 

- MWD 

[m 3 /h]-[m] 

No. of 

Outlets 

Impeller 

Passage 

[mm] 

Mass 

(Weight) 

[kg] 

Material 

Cores 

x mm 2 

Outer 

Dia. 

[mm] 

Cabtyre Cable 

32 

32TRN2.75-62 

32TRN21.5-62 

0.75 

1.5 

D.O.L 

D.O.L 

3.5 

3.5 

8 – 3.5 

17 – 3.5 

6 

6 

10 

12 

55 

55 

PVC 

PVC 

4x 1.25 

4x 1.25 

11.1 

11.1 

6 

6 

50TRN42.2-62 2.2 D.O.L 3.6 38 – 3.6 6 12 140 PVC 4 x 2 11.8 6 

50 50TRN43.7-62 3.7 D.O.L 4 60 – 4 6 12 150 PVC 4 x 3.5 13.9 6 

50TRN45.5-62 5.5 D.O.L 4 79 – 4 6 15 170 CR 4 x 3.5 14.1 8 

80TRN47.5-62 7.5 D.O.L 4.5 112 – 4.5 6 15 190 CR 4 x 5.5 16.8 8 

4 x 3.5 14.1 

80 

80TRN412-62 12 Star-Delta 6 155 – 6 6 15 200 CR 3 x 3.5 

2x 1.25 

12.9 

10.5 

8 

4 x 5.5 16.8 

80TRN417-62 17 Star-Delta 6 220 - 6 6 15 220 CR 3 x 5.5 

2x 1.25 

15.2 

10.5 

8 

4 x 14 21.7 

100 100TRN424-62 24 Star-Delta 6 342 - 6 8 22 460 CR 3 x 14 

2x 1.25 

19.7 

10.5 

10 

4 x 14 21.7 

150 150TRN440-62 40 Star-Delta 6 506 - 6 8 25 635 CR 3 x 14 

2x 1.25 

19.7 

10.5 

10 

Note:) Following notes are applicable to the above two tables. 

✳ The air flow rates are expressed at the standard conditions.: Temperature 20 o C, 1atm 

✳ The air flow rates may vary by up to approximately 5%. 

✳ The Maximum Water Depth (MWD) is the limit of installation depth that the aerator can run without overload. The motor load 

increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the 

motor will be overload, and then the motor protection device will operate, which makes it impossible to run continuously. 

✳ Mass (Weights) excluding cable. 

✳ PVC = PVC sheathed cable CR = Chloroprene rubber sheathed cable 

Cores 

x mm 2 

Outer 

Dia. 

[mm] 


Length 

[m] 

Length 

[m]

4. Shape and Dimension of Aeration Tank 

■ 4-1. Typical Convection Pattern 

· Main Convection: Convection made by rising bubbles. (The 

minimum distance that must be provided between each 

aerator) 

· Sub-convection: The maximum convection that can keep 

solids suspended to prevent sedimentation of solids. 

■ 4-2. Shape of Aeration Tanks 

■ 4-3. Recommended Tank Dimensions (Standard) 

Air- 

inlet 

Bore 

[mm] 

32 

50 

80 

Model 

Motor 

Output 

[kW] 

Max. 

Water 

Depth 

[m] 

Main 

Convection 

Dia. 

[m] 

4 

Circular 

Tank 

φa 

[m] 

Square 

Tank 

a 

[m] 

Dimension of Sub-convection 

Rectangular Tank 

(below 1 : 1.5) 

a 

[m] 

Sub‐convection 

Main Convection 

Circular Tank Square Tank Rectangular Tank 

φa 

h 

a a 

W.L W.L 

W.L W.L 

W.L W.L 

h 

b 

[m] 

Rectangular Tank 

(below 1 : 2) 

32TRN2.75-52/62 0.75 3.5 1.4 3.5 3 3.8 2.5 4 2 

32TRN21.5-52/62 1.5 3.5 1.8 4.5 4 4.5 3 5 2.5 

50TRN42.2-52/62 2.2 3.6 2.4 6 5.5 5.3 3.5 6 3 

50TRN43.7-52/62 3.7 4 3 7 6.5 6.8 4.5 7 3.5 

50TRN45.5-52/62 5.5 4 3.8 9 8 9 6 9 4.5 

80TRN47.5-52/62 7.5 4.5 4.4 10 9 9.8 6.5 10 5 

80TRN412-52/62 12 6 5.2 12 11 11.3 7.5 12 6 

80TRN417-52/62 17 6 5.6 13 11.5 12 8 13 6.5 

100 100TRN424-52/62 24 6 6.3 14.5 13 13.5 9 14 7 

150 150TRN440-52/62 40 6 7.3 17 15 15.8 10.5 16 8 

✳ Dimension of each tank has been determined at the maximum water depth. It shall be altered if the aerator is to be 

installed at a different depth. 

✳ It is recommended to provide a haunch between the bottom of the tank and every side wall in order to maintain the 

mixing efficiency. 

✳ The maximum water depth (MWD) is the limit of installation depth that the aerator can run without overload. The 

motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper 

position than this limit, the motor will be overload, and then the motor protection device will operate, which makes it 

impossible to run continuously. 

a 

h 

a 

[m] 

W.L 

Diffused convection 

flow generated by the 

rising of bubbles 

b 

b 

[m] 


■ 4-4. Notes to the Case that Two or More Aerators are to be installed in a Tank. 

If there is a need to install two or more aerators having the same output in a tank, decide the place of installation 

paying attention to the distance between or among the aerators and the distance between the aerator and the 

tank’s sidewall. The distance between or among the aerators should be more than the “Main Convection Diameter” 

in the table of “4-3. Recommended Tank Dimensions (Standard)” on page 4. The distance between the aerator and 

the sidewall should be so decided that the main convection might not hit directly on the sidewall. 

In addition, it shall be taken into account that the area to be convected by one aerator must be small than 

“Dimension of Sub-convection” in the same table. 

✳ If above-mentioned distances are smaller than the main convection, the aerator will suck the mixed air-water 

current, and as a result it may lead to an unsteady operation of the aerator. 

✳ If the area convected by one aerator is bigger than the sub-convection of each aerator, the sufficiency mixing 

force does not spread throughout the tank, and as a result it may allow the sludge to settle at the tank bottom. 




CIRCULAR TANK 

SQUARE TANK 

Distance between the installed aerators should be 

greater than the main convection diameter. 

5 


W.L 

RECTANGULAR TANK 



5. Aerator with Optional Stand or Draft Tube 

There may be a need to install the aerator at a deeper position than its MWD, for example; 

· An aerator is going to be installed in an existing tank, and it is not possible to alter the depth of the tank, and 

· Because of the limited surface area, the tank must be designed to have a greater depth, etc. 

Adoption of a Tsurumi aerator with optional stand or draft tube (DT) will be one of the solutions for these cases. In case of 

using a stand, the mixing force at the bottom will be weakened as the inlet port of the aerator moves away from the bottom. 

Therefore, we have set the height limit on the stand of 0.5 meters, and for the cases of more than 0.5meters are required, 

we recommend an aerator with a DT. Note that the oxygen transfer rate and the air flow rate of the aerator shall be those 

that are obtainable at its self-aspiration water depth d [installation water depth h – (minus) height of stand or DT]. In 

addition, it shall be noted that the performance of the aerator with DT can be slightly lower than that of the standard. 

When there is a fear of overload occurring to the motor by due to a reason that it is going to operate in a viscous liquid, etc., 

it will be possible to prevent the overload by reducing the self-aspiration water depth d with this method. 

The aerator may move or fall during operation by a reason that it is sitting on an irregular floor like slanted, bumpy, or 

slippery floor, or by a reason that it is installed in such that the weight of air-inlet piping acts on the aerator. Take an 

appropriate preventive measure in accordance with the conditions. In case that there is any flow generating equipment in 

the tank, the same measure must be required. 

■ 5-1. Recommended Tank Dimensions (with Stand or Draft Tube) 

Air- 

inlet 

Bore 

[mm] 

32 

50 

80 

Installation 

Water Depth h 

Discharge Current 

Suction Current 

With a stand of 0.5m 

Image of 0.75kW 

(Available 0.75kW to 40kW) 

Self-aspiration 

Water Depth d 

(Within MWD) 

Discharge 

Current 

With 

Optional Stand 

/ DT 

Suction 

Current 

With a DT of 1.0m 

Image of 5.5kW 

(Available 22kW to 40kW) 

Discharge Current 

Suction 

Current 

with Stand (0.5m) Draft Tube (1.0m) Draft Tube (1.5m) 

Dimension of 

Dimension of 

Dimension of 

Sub-convection 



Model 

Max 

Motor 

Water 

Output 

Depth 

[kW] 

[m] 

Installation 

Water 

Depth h 

[m] 

Circular 

Tank 

φa 

[m] 

Square 

Tank 

a 

[m] 

Installation 

Water 

Depth h 

[m] 

Circular 

Tank 

φa 

[m] 

Square 

Tank 

a 

[m] 

Installation 

Water 

Depth h 

[m] 

Circular 

Tank 

φa 

[m] 

Square 

Tank 

a 

[m] 

32TRN2.75-52/62 0.75 3.5 4 3.5 3 

32TRN21.5-52/62 1.5 3.5 4 4 3.5 

50TRN42.2-52/62 2.2 3.6 4.1 5.5 5 4.6 5 4.5 

50TRN43.7-52/62 3.7 4 4.5 6.5 6 5 6 5.5 

50TRN45.5-52/62 5.5 4 4.5 8.5 7.5 5 8 7 

80TRN47.5-52/62 7.5 4.5 5 9.5 8.5 5.5 9 8 

With a DT of 1.5m 

Image of 40kW 

(Available 24kW to 40kW) 

80TRN412-52/62 12 6 6.5 11.5 10.5 7 11 10 

80TRN417-52/62 17 6 6.5 12.5 11 7 12 10.5 

100 100TRN424-52/62 24 6 6.5 14 12.5 7 13.5 12 7.5 13 11.5 

150 150TRN440-52/62 40 6 6.5 16 14.5 7 15.5 13.5 7.5 15 13 

✳ Dimensions of each tank are those that have been determined under the condition that the self-aspiration water depth d equals to 

the maximum water depth. These dimensions will vary depending on the installation water depth h. 

✳ It is recommended to provide a haunch between the bottom of the tank and every sidewall in order to maintain the mixing efficiency. 

✳ The aerator with a draft tube is not available in the shaded area. 

✳ The maximum water depth is the limit of installation depth that the aerator can run without overload. The motor load increases as 

the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be 

overloaded, and then the motor protection device will operate, which makes it impossible to run continuously. 

✳ Refer to “4-1. Typical Convection Pattern” and “4-2. Shape of Aeration Tanks” on page 4 for the explanations on the tank shape 

and the dimension. 

6 


6. Oxygen Transfer Rate 

The oxygen transfer rate is the speed that the oxygen in the air dissolves into a liquid. It can be a guide when a 

biological treatment is going to be designed. The oxygen transfer rate is not the one that is directly measured. It is 

given from the calculations taking various factors such as DO concentration, ambient temperature, and water 

temperature, etc. The oxygen transfer rate may vary by up to approximately 10%. 

The tables 6-1. below show the results of the tests that have been carried out on the TRN aerators in our test tank. 

It is suggested that these figures be used taking the above conditions into full consideration when selecting the 

aerators. 

The measurement of DO has been made by a Non-steady State method at the condition of fresh water, 20 o C, 1atm, 

with the dissolved oxygen of 0mg/l. The air flow rates are those of standard condition, 20 o C, 1atm. The aerator was 

tested under its standard installation; placed at the center of the tank and at the standard installation depth. 

■ 6–1. Oxygen Transfer Rate Test Result 

▼ 50Hz 

Air-inlet 

Bore 

[mm] 

▼ 60Hz 

Model 

Motor 

Output 

[kW] 

Installation 

Water Depth h 

(Standard) 

[m] 

7 

Air Flow Rate 

[m 3 /h] 

Oxygen 

Transfer Rate 

[kgO 2/h] 

32 

32TRN2.75-52 

32TRN21.5-52 

0.75 

1.5 

3.5 

3.5 

7 

20 

0.6 

1.1 

50TRN42.2-52 2.2 3.6 39 2.4 

50 

50TRN43.7-52 

50TRN45.5-52 

3.7 

5.5 

4 

3 

4 

55 

95 

78 

4.2 

4.9 

5.4 

80TRN47.5-52 7.5 4.5 124 7.3 

80 80TRN412-52 12 

4 

5 

195 

178 

9.9 

11.0 

80TRN417-52 17 5 224 14.9 

100 100TRN424-52 24 5 400 20.2 

150 150TRN440-52 40 5 538 28.9 

Air-inlet 

Bore 

[mm] 

Model 

Motor 

Output 

[kW] 

Installation 

Water Depth h 

(Standard) 

[m] 

Air Flow Rate 

[m 3 /h] 

Oxygen 

Transfer Rate 

[kgO 2/h] 

32 

32TRN2.75-62 

32TRN21.5-62 

0.75 

1.5 

3.5 

3.5 

8 

17 

0.6 

0.9 

50TRN42.2-62 2.2 3.6 38 1.8 

50 50TRN43.7-62 3.7 

3 

4 

69 

60 

3.2 

3.6 

50TRN45.5-62 5.5 4 79 4.8 

80TRN47.5-62 7.5 4.5 112 6.6 

80 80TRN412-62 12 

4 

5 

185 

176 

8.6 

9.9 

80TRN417-62 17 5 232 12.5 

100 100TRN424-62 24 5 368 17.9 

150 150TRN440-62 40 5 555 27.6 

Test Tank 

Plane 

Dimension 

[m] x [m] 

Tank A 

( 5 x 5 ) 

Tank B 

( 10 x 10 ) 

Test Tank 

Plane 

Dimension 

[m] x [m] 

Tank A 

( 5 x 5 ) 

Tank B 

( 10 x 10 ) 


■ 6-2. Oxygen Transfer Rate vs. Water Depth Curve - 50Hz * Calculated from the test result of Table 6-1. 

▼ The oxygen transfer rate may vary by up to approximately 10%. For the actual use, it may further vary depending 

on the type of liquid and the shape of tank, so that select a suitable aerator having a certain margin. 

Oxygen Transfer Rate [kgO 2/h] 


1.2 

1.0 

0.8 

0.6 

0.4 

0.2 

0.0 

6 

5 

4 

3 

2 

1 

0 

0.75kW and 1.5kW 

32TRN21.5-52 

32TRN2.75-52 

0 1 2 3 4 

Water Depth [m] 

50TRN45.5-52 

2.2kW to 5.5kW 

50TRN43.7-52 

50TRN42.2-52 

1 2 3 4 5 


8 



16 

14 

12 

10 

8 

6 

4 

2 

0 

35 

30 

25 

20 

15 

10 

5 

7.5kW to 17kW 

80TRN417-52 

80TRN47.5-52 

80TRN412-52 

1 2 3 4 5 6 7 


150TRN440-52 

24kW and 40kW 

100TRN424-52 

2 3 4 5 6 7 



■ 6-3. Oxygen Transfer Rate vs. Water Depth Curve - 60Hz * Calculated from the test result of Table 6-1. 

▼ The oxygen transfer rate may vary by up to approximately 10%. For the actual use, it may further vary depending 

on the type of liquid and the shape of tank, so that select a suitable aerator having a certain margin. 

Oxygen Transfer Rate [kgO2/h] 


1.2 

1.0 

0.8 

0.6 

0.4 

0.2 

0.0 

6 

5 

4 

3 

2 

1 

0 

0.75kW and 1.5kW 

32TRN21.5-62 

0 1 2 3 4 

50TRN45.5-62 


2.2kW to 5.5kW 

32TRN2.75-62 

1 2 3 4 5 


50TRN43.7-62 

50TRN42.2-62 

9 



35 

30 

25 

20 

15 

10 

16 

14 

12 

10 

5 

8 

6 

4 

2 

0 

7.5kW to 17kW 

80TRN417-62 

1 2 3 4 5 6 7 


150TRN440-62 

80TRN412-62 

80TRN47.5-62 

24kW and 40kW 

100TRN424-62 

2 3 4 5 6 7 



7. Operation System 

■ 7-1. Reduced Speed Operation by Variable Frequency Drive (VFD) 

There are two methods in the adjustment of “air flow rate” and the “oxygen transfer rate” of the result. One is to squeeze the valve 

that is installed in the air-inlet piping, and the other is to reduce the speed of aerator by VFD. However, the aerator has the 

characteristics described below, and different effects are expected. 

· The motor load increases as the installation depth becomes deeper. 

· The motor load increases as we reduce the air flow rate squeezing the valve that is installed in the air-inlet piping. 

In most cases, the adoption of reduced speed operation by VFD will enable us to regulate the air flow rate in a more extensive range than 

operating the valve, without sacrificing the efficiency. A comparison in the methods of adjustment is made in the following table. Refer to 

this table in your planning. 

The graph of 7-1-2. shows comparisons in adjustment range between the two methods and 7-1-3. shows characteristics of reduced 

speed operation by VFD for an aerator (Model 50TRN43.7-62) at 2 meters’ depth which has the widest possible range in the adjustment 

of air flow rate. 

▼ 7-1-1. Comparisons in the Method of Adjustment 

Methods for 

Features 

Adjustment 

(○: shows the merit, ☓: shows the demerit) 

○ Installation will be completed by simply connection the valve at the inlet port of the air-inlet pipe. 

Adjustment ☓ Low power efficiency (kgO2/ kWh) ⇒ Disadvantage in the energy saving 

by squeezing ☓ It is difficult to make an accurate control as the air flow rate and the operating current cannot be stabilized. 

the valve ☓ Louder beat 

☓ Narrow adjustment range at a deeper installation 

☓ It is necessary to install a VFD (extra initial cost is necessary). 

Adjustment ○ The power efficiency (kgO2/ kWh) shall be maintained virtually constant. 

by reducing 

⇒ Energy saving operation with reduced power consumption is possible. 

the speed ○ The air flow rate and the running current can be maintained constant. 

with a VFD 

⇒ Possible to control the air flow rate and the oxygen transfer rate accurately. 

○ Reduction of the operating frequency (reduction in air flow rate) will decrease the sound level. 

▼ 7-1-2. Comparisons in Adjustment Range (for reference only) 

“①” shows the adjustment range served by a VFD, and “②” shows it served by a valve. 

Estimated Air Flow Rate at the Standard Condition (20 o C, 1atm) Test Result at Our Test Tank (5m x 5m) with Clean Water, Converted to 20 o C 

Air Flow Rate [m 3 /h] 

▼ 7-1-3. Characteristics of Reduced Speed Operation by VFD (for reference only) 

Estimated Air Flow Rate at the Standard Condition (20 o C, 1atm) Test Result at Our Test Tank (5m x 5m) with Clean Water, Converted to 20 o C 


90 

80 

70 

60 

50 

40 

30 

20 

90 

80 

70 

60 

50 

40 

30 

① 

Installation Water Depth 

2m 

Decrease 

in Load 

Installation 

Water Depth 

2 m 

20 

35 40 45 50 55 60 65 

Operation Frequency [Hz] 

Increase 

in Load 

35 40 45 50 55 60 65 


Installation 

Water Depth 

4 m 

Installation 

Water Depth 

3 m 

② 

The motor will be overloaded 

if the valve is squeezed more 

than this point. 

10 


Oxyge Transfer Rate [kgO2/h] 

3 

2.5 

2 

1.5 

1 

0.5 

35 40 45 50 55 60 65 

4 

3.5 

3 

2.5 

2 

1.5 

1 

① 

Installation Water Depth 

2m 

The changing trend of the motor load is 

the 

※ 

same 

モータ負荷の変化傾向は左図と同じ 

as left graph. 


Installation 

Water Depth 

4 m 

Installation 

Water Depth 

2 m 

Installation 

Water Depth 

3 m 

0.5 

35 40 45 50 55 60 65 

② 

The motor will be overloaded 

if the valve is squeezed more 

than this point. 

Australian Operation Pump Frequency Industries [Hz] (02) 8865 3500

■ 7-2. Operation in combination with Blower 

This is an operation system that an aerator and a general purpose blower are operated in conjunction. The blower is 

installed at the end of air-inlet line of an aerator and gives pressure to the air. This enables us to install the aerator 

at a deeper position than the designed standard. For example, the aerator can be operated at the depth of 10 meters 

by means of the principle that the general purpose blower gives pressure to the air for 5 meters depth and the 

aerator sucks air for the 5 meters’ depth. 

▼ 7-2-1. Comparison against Other Deep Aeration Methods (in case the tank depth is 10m) 

Aeration 

Equipment 

Submersible 

Aerator 

(Tsurumi 

“TRN” series, 

self-aspiration 

type) 

Submersible 

Aerator 

(Draft Tube 

type axial-flow 

mixer) 

Plate Diffuser 

(Convection by 

line aeration 

method) 

Installation 

Water 

Depth h 

[m] 

10 

Oxygen 

Transfer 

Efficiency 

(Clean Water) 

[%] 

26 to 53 

(Estimated 

value) 

Pressure Loss 

by Equipment 

[kPa] 

0 

(because of the 

self-aspiration 

system) 

5 20 to 30 2.6 to 4.5 

5 15 to 17 

3.92 

+ 0.29 to 0.78 

(aging increase 

in pressure loss) 

Remarks 

(○: Merit, ☓: Demerit) 

○ High in the oxygen 

transfer efficiency as 

the aerator can 

be installed at the bottom. 

○ Possible to operate 

with smaller powers 

(See p.14 7-2-5). 

○ Installation or maintenance 

work can be performed 

without draining the tank 

○ High-durability due to the 

original “air-seal” 

structure and 

the OIL LIFTER. 

☓ One (1) blower must 

be engaged to 

one (1) aerator only. 

○ Possible to reduce the 

equipment quantity as high 

in oxygen transfer rate. 

○ Anaerobic treatment is 

possible. 

☓ Requiring the draft tube. 

☓ Expensive in 

piping equipment. 

☓ Necessary to drain the 

tank in its first installation. 

☓ Requiring the guide plate. 

☓ Expensive in 

piping equipment. 

☓ Necessary to drain 

the tank in its first 

installation and 

maintenance. 

11 

Components Used 

(Summary) 

See p.12 7-2-2 

Equipment necessary for this Operation 

✳ A general purpose blower is supposed to be applicable to use up to 60 kPa. 

✳ The oxygen transfer efficiencies and the figure are quoted from “Guideline and Manual for Planning and Design in Sewerage Systems 

(2001)”. 

✳ When selecting a blower, calculate the required pressure including the loss of pressure which is generated in the piping system. 

Air- 

supply 

Pipe 

Installation 

Water 

Depth h 

Air-supply Pipe 

Draft 

Tube 

Plate Diffuser 

Guide 

Plate 

Submersible 

Aerator 

(Draft Tube 

type 

axial-flow 

mixer) 


Installation 

Water 

Depth h

▼ 7–2-2. Equipment necessary for this Operation 

· The blower must be operated with a VFD (Never use direct-on-line starting to start the blower.). Operation 

with a VFD will be effective in energy saving. 

· One (1) blower must be engaged to one (1) aerator only. This is because, the air is transferred to the deeper 

area of the tank by utilizing both the outlet pressure of the blower and the suction force of the aerator, and it 

is required to keep the balance between the two equipments. If the balance is disrupted, the aerator may idle 

(impeller runs in air) or may stop its operation by due to tripping of the motor protection device caused by an 

overloading reason. As a result of these conditions, the blower gets into the “closed-valve” operation, which 

can cause the danger of a breakdown of the blower by the reason of overload or abnormal pressure. 

· Be sure to provide a non-return valve in the blower outlet piping. This is to prevent the treating liquid from 

flowing back to the blower when the blower stops. Back-flow of the treating liquid pressurizes the air in the 

piping, and this may cause the danger of a breakdown of the blower. 

· Provide a pressure gauge, which indicates the outlet pressure of the blower. This is required for operation 

adjustments. 

· When there is a need for the correct adjustment of air flow rate, provide a flow meter. 

· For other precautions, follow the instructions specified in each design manual. 

Blower House 

Blower 

(with VFD) 

Pressure depth covered 

by the blower 

Self-aspiration water depth d by 

the submersible aerator (within the 

maximum installation water depth 

of each aerator) 

Pressure Gauge 

Non-return Valve 

12 

Air-inlet Pipe 

W.L 

Submersible Aerator 

Installation 

Water Depth h 


▼ 7-2-3. Operation 

· Operation of the submersible aerator and the blower shall be controlled in such a manner that both equipment 

be started or stopped simultaneously. 

· Regulate the acceleration time (VFD) to approximately 10 seconds, and secure the stable starts of these 

equipments. In case that the acceleration time is longer than this, the motor protection device of the aerator 

may trip to stall the aerator by due to overload, and as a result the blower may have the danger of breakdown 

due to overload or an abnormal pressure. In addition, the deceleration time (VFD) shall be regulated to the 

region between 15 to 20 seconds so that the non-return valve may not suffer an impact. 

▼ 7-2-4. Adjusting Procedure for Air Flow Rate (e.g. 200V, 50Hz) 

Step 1. Prepare a clamp meter to measure the running current of the submersible aerator. 

Step 2. Regulate the rotating speed of the blower with VFD, according to the “Initially Targeted Operating 

Point of Blower” in the table of p.15 7-2-7. 

✳ Do not carry out this adjusting work by solely operating the blower. In case that the aerator is not operating 

together, there may be the danger of breakdown of the blower by due to overload or abnormal pressure as 

the blower gets into the “closed-valve” condition. 

Step 3. Start the submersible aerator and the blower simultaneously. 

Step 4. Confirm that the running current of the submersible aerator is within the limit of “Operating Range of 

Aerator on Running Current” described in the table of p.15 7-2-7. If not, rotating speed of the blower so 

that the running current of the submersible aerator may fall within the operating range. 

✳ Method to decrease the running current of submersible aerator; Increase the rotating speed of the blower. 

By this, the self-aspiration water depth d of the submersible aerator becomes shallower and the running 

current will be decreased. 

✳ Method to increase the running current of submersible aerator; Decrease the rotating speed of the blower. 

By this, the self-aspiration water depth d of the submersible aerator becomes deeper and the running 

current will be increased. 

✳ If the running current of the aerator plunges much lower than the “Operating Range of Aerator on Running 

Current”, it shows a symptom that the balance between the outlet pressure of the blower and the suction 

force of the aerator is disrupted, and that the aerator is not generating any suction force because it is idling. 

In this case, stop both of the blower and aerator immediately. If this condition continues, there will be the 

danger of breakdown of the blower by due to overload or an abnormal pressure as the blower gets into the 

“closed-valve” operation. 

Step 5. Adjust the rotating speed of the blower with VFD in such a manner that the blower may discharge the 

targeted air flow rate at its required pressure in a graph of 7-2-11. “Discharge Pressure of Blower vs. Air 

Flow Rate Curve (combination with blower – 50Hz)” on page 18. 

✳ Note that, depending on the operating condition, the blower could discharge the targeted air flow rate at a 

pressure point lower than indicated in a graph of p.18 7-2-11. In this case, adjust the rotating speed of the 

blower assuming that it discharges maximum air flow rate on its graph at the point of minimum (running) 

current in the “Operating Range of Aerator on Running Current” in the table of p.15 7-2-7 and that it 

discharges minimum air flow rate on its graph at the point of maximum (running) current in the range. 

13 


▼ 7-2-5. Selection Procedure (Example) 

Condition - Water Depth of 10m, Required Oxygen Transfer Rate of 16.5kgO2/h (clean water), 200V, 50Hz 

In case of Submersible Aerator + General purpose Blower 

Providing a safety factor of 10% for the required oxygen transfer rate, the required oxygen transfer rate shall be 

18.2kgO2/h. Refer to p.16 7-2-9. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 50Hz), and Model 

80TRN47.5-52 (7.5kW) can be selected. The required air flow rate shall be 180m 3 /h. 

Refer to p.18 7-2-11. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz, 

estimate). When the air flow rate required is 180m 3 /h (3.00m 3 /min), the required discharge pressure shall be 

0.053MPa (53kPa). 

In case that a margin of 5kPa is added to the discharge pressure of the blower (considering the pressure loss in 

the pipe and a margin), the blower should have a duty of 53 + 5 = 58 kPa. 

Required air flow rate shall be 3.15m 3 /min. including 5% allowance. Model RSR-80 (1370min –1 , 3.20m 3 /min, at 

58.8kPa, 5.01kW) can be selected, 

The total required power is 〔7.5 + 5.01 = 12.51kW〕 

▼ 7-2-6. Recommended Tank Dimensions (combination with blower) 

Air-inlet Bore 

[mm] 

50 

80 

Model 

Motor Output 

[kW] 

50TRN42.2-52/62 2.2 

50TRN43.7-52/62 3.7 

50TRN45.5-52/62 5.5 

80TRN47.5-52/62 7.5 

80TRN412—52/62 12 

80TRN417-52/62 17 

100 100TRN424—52/62 24 

150 150TRN440—52/62 40 

Installation Water 

Depth h 

[m] 

14 

Blower Dimension of Sub-convection 

Discharge Pressure 

[kPa] 

6 24 

8 44 

9.6 60 

6 20 

8 40 

10 60 

6 20 

8 40 

10 60 

6 20 

8 40 

10 60 

6 20 

8 40 

10 60 

6 20 

8 40 

10 60 

6 20 

8 40 

10 60 

6 20 

8 40 

10 60 

Circular Tank 

φa 

[m] 

Square Tank 

a 

[m] 

6 5.5 

7 6.5 

9 8 

10 9 

12 11 

13 11.5 

14.5 13 

17 15 

✳ The above table shows the estimated values under the condition that the self-aspiration water depth d (installation 

depth h – Pressure depth covered by the blower) be 4 meters. The aerating depth of 2.2kW model is 3.6 meters. For 

other operating conditions, refer to p.18 7-2-11. “Discharge pressure of Blower vs. Air Flow Rate Curve (combination 

with blower - 50Hz)”, or p.19 7-2-12. “Discharge pressure of Blower vs. Air Flow Rate Curve (combination with 

blower - 60Hz)”. 

✳ Discharge pressures in above do not include the pressure loss in the piping. It is required to calculate and add it to the 

above value when selecting the blower. 

✳ It is recommended that a haunch be provided between each sidewall and the bottom of the tank so as to maintain the 

mixing efficiency. 

✳ Only the above models are applicable to the combined use of an aerator and a blower. 

✳ Refer to “4-1. Typical Convection Pattern” and “4-2. Shape of Aeration Tanks” on page 4 for explanations on the 

tank shape and the dimension. 


▼ 7-2-7. Initially Targeted Operating Point of Blower and 

Operating Range of Aerator on Running Current (combination with blower - 50Hz) 

● 50Hz 

Model 

Motor 

Output 

[kW] 

50TRN42.2-52 2.2 

50TRN43.7-52 3.7 

50TRN45.5-52 5.5 

80TRN47.5-52 7.5 

80TRN412-52 12 

80TRN417-52 17 

100TRN424-52 24 

150TRN440-52 40 

Installation 

Water 

Depth h 

[m] 

Initially Targeted Operating Point 

of Blower 


of Blower 

[kPa] 

15 

Inlet Air Flow Rate 

of Blower 

[m 3 /min] 

6 24 0.77 

8 44 0.87 

9.6 60 1.12 

6 20 1.05 

8 40 1.18 

10 60 1.50 

6 20 1.50 

8 40 1.68 

10 60 2.2 

6 15 2.3 

8 35 2.6 

10 55 3.1 

6 10 3.2 

8 30 3.6 

10 50 4.5 

6 10 4.0 

8 30 4.5 

10 50 5.4 

6 10 7.1 

8 30 8.0 

10 50 9.3 

6 10 9.6 

8 30 10.8 

10 50 12.8 

Operating Range of Aerator 

on Running Current 

(200V) 

[A] 

(400V) 

[A] 

9.0 to 10.5 4.5 to 5.3 

13.5 to 17.2 7.0 to 8.6 

20.0 to 24.3 10.0 to 12.1 

23.5 to 31.8 12.0 to 15.9 

36.0 to 51.4 18.0 to 25.7 

51.0 to 70.3 26.0 to 35.2 

78 to 96 39 to 48 

134 to 165 67 to 83 

▼ 7-2-8. Initially Targeted Operating Point of Blower and 

Operating Range of Aerator on Running Current (combination with blower – 60Hz) 

● 60Hz 

Model 

Motor 

Output 

[kW] 

Installation 

Water 

Depth h 

[m] 

Initially Targeted Operating Point 

of Blower 


of Blower 

[kPa] 

Inlet Air Flow Rate 

of Blower 

[m 3 /min] 

Operating Range of Aerator 

on Running Current 

(200V) 

(400V) 

6 24 0.76 

50TRN42.2-62 2.2 

8 44 0.85 

8.0 to 9.5 4.0 to 4.8 

9.6 60 1.00 

6 20 1.13 

50TRN43.7-62 3.7 

8 40 1.30 

12.5 to 16.0 6.5 to 8.0 

10 60 1.58 

6 20 1.50 

50TRN45.5-62 5.5 

8 40 1.70 

17.5 to 22.6 9.0 to 11.3 

10 60 2.1 

6 15 2.1 

80TRN47.5-62 7.5 

8 35 2.3 

23.0 to 29.6 11.5 to 15.0 

10 55 2.7 

6 10 3.3 

80TRN412-62 12 

8 30 3.7 

34.0 to 47.6 17.0 to 23.8 

10 50 4.3 

6 10 4.1 

80TRN417-62 17 

8 30 4.6 

44.0 to 66.3 22.0 to 33.2 

10 50 5.4 

6 10 7.1 

100TRN424-62 24 

8 30 7.4 

80 to 96 40 to 48 

10 50 8.4 

6 10 9.8 

150TRN440-62 40 

8 30 11.1 

145 to 165 73 to 83 

10 50 13.0 

✳ The above tables are those that are to be utilized in p.13 7-2-4. “Adjusting Procedure for Air Flow Rate (e.g. 200V, 50Hz)”. 

✳ To adjust the air flow rate of the blower initially, set the VFD to regulate the blower speed to perform “Initially Targeted Operating 

Point of Blower”. 

✳ For the operation in combination with a blower, adjust the rotating speed of the blower so that the running current of the 

submersible aerator may fall within the “Operating Range of Aerator” stated above. If the running current of the aerator goes 

beyond its range, the balance between the outlet pressure of the blower and the suction force of the aerator will be disrupted, and 

the aerator will idle (impeller runs in air) or will stop its operation by due to tripping of the motor protection device caused by an 

overloading reason. As a result of these conditions, the blower gets into the “closed-valve” operation, which can cause the danger 

of breakdown of the blower by the reason of overload or abnormal pressure. 

[A] 

[A] 


▼ 7-2-9. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 50Hz) 

* Calculated from 6-1 and 7-2-11 

● Data on this page are for reference only. It is suggested that a certain safety margin be added in your selection. 





9 

8 

50TRN42.2-52 

7 

8m 

Installation 

6 

5 

4 

Depth 

9.6m 

3 

2 

6m 

20 30 40 50 60 70 80 

16 

14 

12 

10 

8 

6 

4 


2 

20 40 60 80 100 120 140 

20 

18 

16 

14 

12 

10 

8 

6 

6m 

50TRN43.7-52 

8m 


Installation 

Depth 

10m 

4 

60 80 100 120 140 160 180 

22 

20 

18 

16 

14 

12 

10 

8 

6m 

8m 

50TRN45.5-52 


8m 

6m 

80TRN47.5-52 

Installation 

Depth 

10m 

6 

100 120 140 160 180 200 220 240 


Installation 

Depth 

10m 

16 





30 

25 

20 

15 

6m 

8m 

80TRN412-52 

10 

150 200 250 300 350 

40 

35 

30 

25 

20 

15 

8m 


80TRN417-52 

6m 

Installation 

Depth 

10m 

10 

200 250 300 350 400 450 

60 

50 

40 

30 

20 


100TRN424-52 

6m 

8m 

Installation 

Depth 

10m 

10 

300 400 500 600 700 

80 

70 

60 

50 

40 

30 

20 

8m 

6m 


150TRN440-52 

Installation 

Depth 

10m 

10 

500 600 700 800 900 1000 

Air Flow Rate[m 3 /h] 

Installation 

Depth 

10m 


▼ 7-2-10. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 60Hz) 

* Calculated from 6-1 and 7-2-11 

● Data on this page are for reference only. It is suggested that a certain safety margin be added in your selection. 





9 

8 

50TRN42.2-62 

7 

Installation 

6 

5 

4 

8m 

Depth 

9.6m 

3 

2 

6m 

20 30 40 50 60 70 80 

16 

14 

12 

10 

8 

6 

4 


2 

20 40 60 80 100 120 140 

20 

18 

16 

14 

12 

10 

8 

6m 

50TRN43.7-62 

8m 


Installation 

Depth 

10m 

6 

4 

6m 

60 80 100 120 140 160 180 

22 

20 

18 

16 

14 

12 

10 

8 

8m 

8m 

50TRN45.5-62 


80TRN47.5-52 

6m 

Installation 

Depth 

10m 

6 

100 120 140 160 180 200 220 240 


Installation 

Depth 

10m 

17 





30 

25 

20 

15 

6m 

80TRN412-62 

8m 

10 

150 200 250 300 350 

40 

35 

30 

25 

20 

15 

80 

70 

60 

50 

40 

30 

20 

8m 


150TRN440-62 

6m 

80TRN417-62 

6m 

Installation 

Depth 

10m 

10 

200 250 300 350 400 45 

60 

50 

40 

30 


8m 

100TRN424-62 

8m Installation 

Depth 

10m 

10 

500 600 700 800 900 1000 


Installation 

Depth 

10m 

20 

10 

6m 

300 400 500 600 700 


Installation 

Depth 

10m 


▼ 7-2-11. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz) 



240 

220 

200 

180 

160 

140 

120 

100 

140 

130 

120 

110 

100 

80 

60 

90 

80 

70 

60 

50 

40 

30 

20 

10 

0 

50TRN42.2-52 and 50TRN43.7-52 

50TRN43.7-52 

Installation 

Depth 

6m 

Installation 

Depth 

6m 

8m 

8m 

10m 

50TRN42.2-52 

0 0.02 0.04 0.06 0.08 

Discharge Pressure of Blower [MPa] 

50TRN45.5-52 and 80TRN47.5-52 

80TRN47.5-52 

Installation 

Depth 

6m 

8m 

Installation 

Depth 

6m 

8m 

10m 

50TRN45.5-52 

Estimated Air Flow Rate at the Standard Condition (20 o C, 1atm) 

9.6m 

0 0.02 0.04 0.06 0.08 


10m 

18 



420 

400 

380 

360 

340 

320 

300 

280 

260 

240 

220 

200 

180 

160 

1000 

950 

900 

850 

800 

750 

700 

650 

600 

550 

500 

450 

400 

350 

300 

80TRN412-52 and 80TRN417-52 

80TRN417-52 

Installation 

Depth 

6m 

8m 

Installation 

Depth 

6m 

8m 

10m 

10m 

0 0.02 0.04 0.06 0.08 


80TRN412-52 

100TRN424-52 and 150TRN440-52 

150TRN440-52 

Installation 

Depth 

6m 

8m 

Installation 

Depth 

6m 

8m 

10m 

10m 

100TRN424-52 

0 0.02 0.04 0.06 0.08 



▼ 7-2-12. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 60Hz) 



140 

130 

120 

110 

100 

90 

80 

70 

60 

50 

40 

30 

20 

10 

0 

240 

220 

200 

180 

160 

140 

120 

100 

80 

60 

50TRN42.2-62 and 50TRN43.7-62 

50TRN43.7-62 

Installation 

Depth 

6m 

Installation 

Depth 

6m 

8m 

8m 

10m 

50TRN42.2-62 

0 0.02 0.04 0.06 0.08 


Estimated Air Flow Rate at the Standard Condition (20 o C, 1atm) 

9.6m 

50TRN45.5-62 and 80TRN47.5-62 

80TRN47.5-62 

Installation 

Depth 

6m 

8m 

Installation 

Depth 

6m 

8m 

10m 

50TRN45.5-62 

0 0.02 0.04 0.06 0.08 


10m 

19 



420 

400 

380 

360 

340 

320 

300 

280 

260 

240 

220 

200 

180 

160 

1000 

950 

900 

850 

800 

750 

700 

650 

600 

550 

500 

450 

400 

350 

300 

80TRN412-62 and 80TRN417-62 

Installation 

Depth 

6m 

80TRN417-62 

8m 

Installation 

Depth 

6m 

8m 

10m 

10m 

0 0.02 0.04 0.06 0.08 

Dicharge Pressure of Blower [MPa] 

80TRN412-62 

100TRN424-62 and 150TRN440-62 

150TRN440-62 

Installation 

Depth 

6m 

8m 

Installation 

Depth 

6m 

8m 

10m 

100TRN424-62 

0 0.02 0.04 0.06 0.08 

Discarge Pressure of Blower [MPa] 

10m 


8. About Noise 

Suction noise will be generated at the suction silencer while the gas to be handled is being sucked by the submersible 

aerator. “8-2. Measured Sound Pressure Level Data” shows the sound pressure level of each aerator. Note that 

these sound pressure level data are those measured at an indoor test facility in our factory and are not the 

guaranteed figures that are expected at your site. Also note that the sound pressure level may vary depending on 

various factors like piping condition. 

■ 8-1. Measured Point and Condition 

■ 8-2. Measured Sound Pressure Level Data 

Air-inlet Bore 

[mm] 

32 

50 

80 

Silencer 1m 

Sound Level Meter 

1.6m 

Model 

Motor Output 

[kW] 

32TRN2.75 0.75 

32TRN21.5 1.5 

50TRN42.2 2.2 

50TRN43.7 3.7 

50TRN45.5 5.5 

80TRN47.5 7.5 

80TRN412 12 

80TRN417 17 

100 100TRN424 24 

150 150TRN440 40 

20 

Factory Structure 

Air-inlet Piping 

(PVC Flexible Hose, 10m) 

1m from the 

Silencer 

A-weighted 

Installation 

Sound Pressure 

Water Depth h 

[m] 

Level 

[dB(A)] 

1.5 53 

3.5 54 

1.5 53 

3.5 58 

2.5 61 

3.6 61 

2 66 

4 70 

2 69 

4 70 

2 71 

4.5 68 

3 72 

6 73 

3 74 

6 72 

4.5 73 

6 74 

3.5 70 

6 74 

The Inside of the 

Factory Structure 

Back Ground 

Noise Level 

[dB(A)] 

✳ Measurements of the sound pressure level have been carried out in accordance with JIS B 8346-1991, “Fans, Blowers and 

Compressors - Determination of A-weighted Sound Pressure Level”. 

✳ The equipment used for the measurement was a standard sound level meter that complies with JIS C 1502. 

✳ Frequency correction “A” and “SLOW” time weighting were used for the sound level meter. 

✳ The sound pressure level data are those that have been calculated from the average sound pressure levels measured at 

four (4) points, all of which are located at the same height of 1.6m from the floor but are equally distributed to four-way to 

the distance of 1m away from the silencer. 

W.L 

Submersible 

Aerator 

43 

43 

43 

43 

43 

42 

42 

45 

45 

49 


KE & KM Bar Screens 

Mechanically cleaned bar screens; designed for the small plant inflows to 

remove solids from the wastewater, eliminating solids from aeration & 

Clarification tanks. Screen capacity range from 1 GPM to 690 GPM. Bar 

spacing range from 1mm to 50mm. Screen is fabricate in 304 stainless steel for 

corrosion resistance. 

APPLICATION 

, Primary treatment at a factory wastewater treatment plant 

, Screening suspended solid from kitchen effluent at hotel, factory, hospital, etc. 

, Screening suspended solid from wastewater at small scale wastewater facility 

The KE/KS SERIES are front-type mechanical bar screens in which major parts are made of 304 

stainless steel. The saw teeth on each rake travel between screen bars, which prevents foreign 

matters from lodging in the screen bars. The KS-series has an eccentric roller mechanism that pulls 

the rake out of the screen bars at the solids releasing point and eliminates the jamming of solids. 

The KM/KMA SERIES are rear-type mechanical bar screens in which major parts are made of 304 

stainless steel. The chain and sprocket do not come in contact with the liquid that prevents sticking 

of solids to the rotating parts. Being a self-standing design, it can be directly installed to a Ushaped 

waterway. 

Discharge 

Bore (mm) 

TRN Submersible Aerator 

The TRN is designed for very high oxygen transfer efficiency and to mix entrained solids. 

, Non-clog impellers. 

, Horsepower ranges from 1 hp to 50 hp. 

, Can operate in water depth of 32 feet with supplemental blower. 

, Powerful stirring and mixing capabilities for convectional circulation. 

, Compact shape and design. 

, Self aspiration of oxygen eliminates need for compressed air. 

FHP Series decanting pump 

The FHP-series is a decanting pump with a device for monitoring the sludge surface. The pump 

ensures that only supernatant liquid is discharged, without any sediment. 

FSP Series skimmer pump 

The FSP-series is a scum skimmer incorporating a jet injector. It guarantees a stable sucking process 

even if water, air, and suspended matter are drawn in from water surface simultaneously. 

Model Motor 

Output 

KW 

Discharge 

Bore (mm) 

Phase Starting 

Method 

Model Motor 

Output KW 

Speed Max. Solid 

Handling 

mm 

p 11 

Phase Starting 

Method 

Cable 

length 

m 

50 4-FSP 0.4 3-phase d.o.l. 3000 16 6 

50 8-FSP 0.75 3-phase d.o.l. 3000 22 6 

Dry Weight kg 

FREE STANDING 

Head Max. 

m 

Capacity max./ 

min 

40 FHP2-3 0.25 Capacitor 29.5 8 200 6 

40 FHP2-3T 0.25 Capacitor 27.5 8 200 6 

50 FHP-4 0.4 single Capacitor 29 10 280 6 

50 FHP-4T 0.4 3-phase d.o.l. 27 10 280 6 

50 FHP3-8T 0.75 3-phase d.o.l. 27.5 13 420 6 

80 FHP2-15T 1.5 3-phase d.o.l. 60 11 800 6 

Cable 

length 

m 

Pump selection software available … Australian Pump 02 8865 3500 

TRN, FHP, KE & KM SERIES

Equipment Selection Guide 

Sewage/waste 

water pumps 

Effluent 

Pumps 

Type Model Discharge bore mm Motor Output kW Feature 

Corrosion 

resistant 

Explosion proof 

Corrosion 

resistant 

B 50-800 0.4-110 Basic sewage pump 

BZ 80-100 1.5-15 Basic sewage pump with large solid passage 

C 50-100 0.75-15 Basic sewage pump with cutter mechanism 

U 40-80 0.25-3.7 Vortex sewage pump with 2 pole motor 

UZ 50-100 1.5-11 Vortex sewage pump with large solid passage 

UT 50 0.4 Vortex sewage pump with single phase motor 

PU 40-80 0.15-1.5 Vortex sewage pump - resin 

PN 40-50 0.25-1.5 Semi-vortex wastewater pump - resin 

MG 32-50 1-3.7 High head grinder pump 

BQ 50-100 0.4-3.7 Cast ss version of B series 

CQ 50-100 0.75-3.7 Cast ss version of C series 

BX 80-100 1.6-3.8 Explosion proof version of B series 

CX 80-100 1.6-3.8 Explosion proof version of C series 

UX 50-80 1.6-4 Explosion proof version of U series 

PSF 40-50 0.25-1.5 High head effluent pump - resin 

SF 50-80 0.75-11 Semi-open impeller, for high head pumping 

OM 32 0.15 Semi-vortex effluent pump - resin 

SQ 40-50 0.25-0.75 Lightweight ss effluent pump 

SFQ 50-80 0.4-11 Chemical effluent pump - cast ss 

TM 40-50 0.25-0.75 Seawater pump - titanium & resin 

Blower RS 20-150 0.4-45 Rotary air blower 

Water 

Aerator 

TRN 

BER 

32-150 

25-50 

0.75-40 

0.75-5.5 

Submersible self aspirating aerator 

Submersible axial-flow type aerator 

Treatment Skimmer FSP 50 0.4-0.75 Floating scum skimmer 

Equipment Decanting pump FHP 40-80 0.25-1.5 Float type decanting pump 

Bar Screen 

KE/KS 

KM/KMA 

- 

- 

- 

- 

Automatic mechanical bar screen (front) 

Automatic mechanical bar screen (rear) 

Dewatering pump range also available … contact Aussie Pumps for more details 

Australian Pump Industries Pty Ltd 

7 Gladstone Road, Castle Hill NSW 2154 

Ph: (02) 8865 3500 Fax: (02) 9894 4240 

www.aussiepumps.com.au 

info@aussiepumps.com.au

Aussie Pumps Australian Pump Industries - Ferret

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