pdf/L900-liquid ring vacuum pumps and compressors

L_Series 

L_900 

Liquid Ring Vacuum Pumps and Compressors

L_900 Performance you can count on 

Pulp and paper industry 

Process industries 

Geothermal plants

Model 2BE3 

Model P 2620 

L_900: powerful, efficient, reliable 

For over a century, both Nash and Siemens (elmo) have produced robust, 

efficient and reliable liquid ring pumps and compressors to meet the 

rigorous needs of such industries as 

■ 

■ 

■ 

■ 

■ 

Pulp and paper industry 

Mining 

Geothermal plants 

Sugar industry 

Process industries 

... and many others 

When the two companies merged in 2002, we combined our product lines to 

enable us to offer the highest performance, reliability and efficiency in every 

product class. Each model of the L_900 pumps and compressors is equipped 

with an industry proven polyisoprene-lined pump casing to protect the pump 

internals against corrosion and erosion. The unique inlet and discharge configuration 

of each machine offers flexibility in piping and the top discharge 

capability of the 2BE3 models eliminates the need for a trench and minimizes 

floorspace. Each pump is 100% factory performance tested prior to shipment 

and is backed by a two year warranty against materials and workmanship. 

nash_elmo Industries L_900 3

L_900 Technical highlights 

Split vacuum capability 

With the addition of the center partition wall (or center shroud) in 

the pump body, each half of the L_900 can operate at different 

vacuum levels with differential pressures up to 338 mbar (10 in. Hg) 

between the two pump halves. The advantage of this is significant 

because it allows the use of fewer vacuum pumps which saves 

space and installed cost. 

Quiet operation and easy maintenance 

Despite their size and capacity, the L_900 Series are amazingly quiet 

during operation. Sound levels of 72 to 85 dBa (measured at a distance 

of 1 meter (3.3 ft) from the source) have been recorded for even the 

largest of the pump models. 

Internal inspections are easily performed either through large 

inspection ports located in the pump heads or through unused 

discharge connections. No dismantling of the pump is required. 

Robust, reliable and ready 

Because the internal components rotate without making contact, 

liquid ring vacuum pumps are practically wear and maintenance 

free. The standard polyisoprene lining on the pump body resists 

aggressive process gases and liquids to provide exceptional corrosion 

resistance. For added corrosion resistance, stainless steel internal 

components are available in certain models. Double-row tapered 

roller bearings increase life in both belt and direct drive applications. 

No matter what your application, the L_900 is ready to handle 

all of your process needs! 

Features 

Polyisoprene lined pump body 

Stainless steel components available 

Multiple inlet & discharge configurations 

Top discharge capability on 2BE3 models 

Self-recirculating capability on 2BE3 models 

Split vacuum capability 

Variable porting 

Unique internal construction 

Large inspection ports 

Double extended shafts 

100% performance tested prior to shipment 

Backed by two year warranty and over 100 years 

of vacuum and compressed gas experience 

Benefits 

Superior corrosion resistance 

Added corrosion resistance, application flexibility 

Piping flexibility 

Eliminates need for trench, minimizes floorspace 

Eliminates need for a pressurized external seal 

water source 

Installation flexibility, minimizes number of pumps 

Handles entire vacuum range without changing 

pump internals 

Minimizes scale build-up 

Easier internal inspections 

Additional installation choices 

Trouble-free startup and operation 

Peace of mind 

4 nash_elmo Industries L_900

Installation Flexibility 

Due to the design of the pump heads, the L_900 models offer many 

options for connecting both the inlet and discharge piping to simplify 

installation in both new facilities or existing facilities where headroom 

and space is limited. 

From the vertical and horizontal inlet capability of the 2BE3 and P 2620 

models to the top discharge capability of the 2BE3 models, the L_900 

Series offers the best solution for your application. 

Contact your local nash_elmo reprensentative or direct sales person to 

discuss how the L_900 will fit your specific process needs. 

Self-recirculation capability 

The 2BE3 models help minimize water consumption through its ability to 

internally recirculate seal water – without the need for circulating 

pumps or external controls. The design of the internals also allows the 

pump to draw water from an atmospheric tank without an external 

pumping source alleviating the need for expensive pumps and control 

systems. 

Inlet 

Inlet 

Discharge 

Discharge 

2BE3 Exploded drawing 


L_900 Capacity range 

cfm 0 5,000 10,000 15,000 20,000 25,000 

P 2620 

2BE3 72 

2BE3 67 

2BE3 62 

2BE3 60 

2BE3 52 

2BE3 50 

2BE3 42 

2BE3 40 

2BE3 32 

2BE3 30 

m 3 /h 0 8,500 17,000 25,500 34,000 

42,500 

With eleven pump models and capacities that range from 2,500 to 

37,000 m 3 /h (1,500 cfm to 22,000 cfm), the L_900 Series has a pump 

to meet your specific process needs. Our largest model, the P 2620, 

with a capacity range of 22,000 to 37,000 m 3 /h (14,000 cfm to 

22,000 cfm) offers an economical solution for most high volume 

applications found in the paper and mining industries. 

P 2620 

Inlet 

Discharge 

Discharge 


L_900 Vacuum pumps in the paper industry 

B 

2 

A 

A 1 

Suction 

E 

C 

D 

Discharge 

2 

A 

Model 2BE3 30 – 2BE3 72 

E 

D 

C 

B 

1 

A 

Model P 2620 

Model 

A 1 A 2 B C D E Suction & discharge 

flange connection 

P 2620 584 4300 2030 2005 900 3040 DN400 DN350 mm 

23 169 80 79 36 120 16-IN. FLG. 14-IN. FLG. inches 

2BE3 72 3590 3945 2095 2030 1060 2500 DN400 DN400 mm 


2BE3 67 3390 3750 1915 1900 975 2280 DN350 DN350 mm 


2BE3 62 3130 3440 1790 1760 900 2140 DN350 DN350 mm 


2BE3 60 2835 3145 1790 1760 900 1845 DN350 DN350 mm 


2BE3 52 2855 3165 1540 1490 775 1820 DN300 DN300 mm 


2BE3 50 2605 2915 1540 1490 775 1570 DN300 DN300 mm 


2BE3 42 2390 2650 1260 1195 620 1460 DN250 DN250 mm 


2BE3 40 2102 2360 1285 1195 620 1170 DN250 DN250 mm 


2BE3 32 1896 2110 970 935 475 1130 DN150 DN150 mm 


2BE3 30 1660 1875 970 935 475 890 DN150 DN150 mm 


All dimensions are approximate. 


Commitment, reliability and worldwide support 

For 100 years, we have been assisting our customers in making the right vacuum pump 

or compressor choice. As your engineering partners, we will provide you with a 

nash_elmo performance analysis which includes a review of your particular process 

requirements, and provides you with alternative means for meeting your process needs. 

We will supply engineering data and application information, along with short- and 

long-term cost comparisons. 

Beginning today and throughout the life of every nash_elmo system, our engineers are 

ready to support you to meet your vacuum and compressor process tasks. 

Factory tested 

Before any nash_elmo vacuum pump or compressor is shipped out of our factory, it is 

performance tested to meet the highest standards. We stand behind our products: every 

nash_elmo L_900 pump comes with a TWO-YEAR WARRANTY. Our new test bay gives us 

the capability to simulate nearly all real operating conditions for liquid ring pumps. 

A global service network with local support 

nash_elmo maintains service centers strategically located throughout the United States, 

Europe and Asia. Each center is staffed by specialists with considerable application 

know-how. They have original factory replacement parts in stock and are equipped 

with the tools, fixtures and special machinery necessary for pump and compressor 

repair. The nash_elmo commitment to service extends to its regional distribution centers 

and retailers. Stocked with inventories of factory parts and purchased components, 

our distribution centers can deliver pumps and parts anywhere, any time. We are also 

able to service vacuum pumps and compressors of other makes and models. 

A new company, a unified vision 

nash_elmo is more than a new company. It is the fusion of global leaders in the 

development, design and application of vacuum and compressor system technology. 

Our combined resources give us the ability to provide the best solution to any industrial 

need virtually anywhere in the world. We are a company with an extensive range of 

products and services and an unmatched reputation for reliability. Because nash_elmo 

is a company with the resources to turn the most ambitious vision into reality and to 

put that vision to work for you. 


Other nash_elmo product lines 

L_Series: 

Liquid Ring Pumps 

Robust technology for the highest demands and varied applications 

Machines in the L_Series distinguish themselves through low operating 

temperatures and are suitable for handling splash water, steam 

and condensates. They were developed for the toughest applications 

and can safely and reliably extract or compress even explosive gas/ 

steam mixtures (ATEX-certified). Selection of a suitable operating 

liquid enables the L_Series vacuum pumps and compressors to be 

optimally integrated into processes. Thanks to their low operating 

costs and extensive performance range up to 37,000 m 3 /h 

(22,000 cfm), they excel in any application. 

G_Series: 

V_Series: 

D_Series: 

Gas Ring Blowers 

Vane Pumps 

Dry Pumps 

nash_elmo Industries 

www.nash-elmo.com 

info@nash-elmo.com 

Corporate Headquarters 

Trumbull, CT USA 

9 Trefoil Drive 

Trumbull, CT 06611-1330 

Tel.: +1 800 553 6274 

Proven, reliable and extremely quiet 

Whether vacuum pumps, compressors or systems for conveying air, 

gases or air/gas mixtures, the extensive range of products in the 

G_Series meets the widest range of requirements. Thanks to their 

variable voltage motors, many are usable anywhere in the world 

without the need for conversion. In addition to their compact construction, 

full UL/CSA certification and innovative design, G_Series 

pumps and compressors offer a comprehensive power range up to 

2,500 m 3 /h (1,470 cfm), maximum power density and a wide selection 

of accessories, including frequency converters. 

Simple design for varied applications 

The vane pumps in our V_Series are known for their robust design, 

easy handling and long service life. Furnished with an extremely 

sturdy metal coating as well as installation- and service-friendly 

plug & play functionality, these high performance machines are 

extremely quiet in operation, and can meet even the most challenging 

industrial demands while covering an impressive performance 

range up to 4,000m 3 /h (2,350 cfm) and 10 bar g (145 psig). 

High reliability with low operating costs 

The dry-running vacuum pumps in our D_Series are explosion-proof 

and were specially developed for production processes involving 

sensitive materials. Throughout the entire process, they operate 

condensation-free – and therefore corrosion-free – because there 

are no operating fluids to mix with the process gases. As a result, 

discharge gases can simply be collected and/or returned to the process. 

There are no waste products. In addition, all pumps in the D_Series 

are highly efficient and provide a constant suction capacity over an 

extremely wide range of pressures with a performance range up to 

to 2,200 m 3 /h (1,300 cfm). 

European Headquarters 

Nuremberg, Germany 

Katzwanger Straße 150 

D-90461 Nürnberg 

Tel.: +49 911 1454 0 

Order-No: VNE:B-PB003-A2-EN 

Printed in Germany 

Dispo 27801 

2238/018 6.0 / 04-2004 

© 2004 All rights reserved 

HENNIG · Nbg All illustrations are non-binding · All dimensions are approximate · Subject to technical modifications

pdf/L900-liquid ring vacuum pumps and compressors

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