Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Mechanical Seals 381 Table 17-4 Temperature Limitations for Common Secondary and Static Seals An additional consideration in the selection of the primary and mating rings is their PV limitations. As discussed in the section on seal wear, a PV value can be determined for each application and compared to those given in Table 17-2. A value of less than the value given in the table will result in a seal life greater than two years. Also shown in Table 17-5 are the physical properties of common seal face materials. Mating Ring Designs A complete seal installation consists of the seal head assembly and a mating ring assembly. The mating ring assembly consists of the mating ring and a static seal. There are five common mating ring types; a) groove O-ring, b) square section, c) cup mounted, d) floating, and e) clamped in (Figure 17-20). Other designs may exist but they are all variations of these common types. The purpose of a mating ring is to provide a hard surface for the softer member of the seal face to run against. Because wear will occur at the seal faces, the mating ring must be designed as a replaceable part in the seal installation. This is accomplished through the use of a static seal, as shown. The material of construction of the static seal will determine the temperature limit of the assembly.
Table 17-5 Properties of Common Seal Face Materials PROPERTY CAST IRON NI RESIST 85% (AL203) CERAMIC 99% JAL203) TUNGSTEN !6% N!) CARBIDE SILICON ISI-C! RESIN CARBON BABBITT BRONZE SIL ICONIZED CARBON MODULUS OF ELASTICITY X IOE6 LB/IN2 f3 - 16 10.5 - 16.9 32 50 90 48 - 57 2.5 - 4.0 1.04 - 4. ! 2.9 - 4.4 2 2.3 TENSILE STRENGTH X IOE3 LB/IN2 65 - 120 20 - 45 20 39 123.25 20.65 8 - 8.6 8 - 8.6 7.5 - 9 2 CO-EFFICIENT OF THERMAL EXPANSION X IOE-6 IN/IN F 6.6 6.5 - 6.8 3.9 4.3 2.66 1 .06 2. 1 - 2.7 2. ! - 2.7 2.4 - 3, 1 2.4 - 3.2 THERMAL CONDUCTIVITY BlU.FT/H X FT2 F 23 - 29 25 - 26 8.5 14.5 4 ! - 4S 41-60 6-9 6-9 8 - g.5 30 DENSITY L8/IN3 0.259 - 0.268 0.264 - 0.268 0, 123 0.13? 0.59 0.104 0.064 - 0.069 0.0ft3 - 0. 1 12 0.083 - 0.097 0.06 - 0.070 HARDNESS BRINELL-"-- ROCKWELL A- ----ROCKWELL 45N--- - — --SHORE ROCKWEtL IS! ^!7 - 269 !31 - 183 »? 8? 93 66 - 88 80-105 60-95 70 -
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Table 17-5<br />
Properties of Common Seal Face Materials<br />
PROPERTY<br />
CAST<br />
IRON<br />
NI<br />
RESIST<br />
85%<br />
(AL203)<br />
CERAMIC<br />
99%<br />
JAL203)<br />
TUNGSTEN<br />
!6% N!)<br />
CARBIDE<br />
SILICON<br />
ISI-C!<br />
RESIN<br />
CARBON<br />
BABBITT<br />
BRONZE<br />
SIL ICONIZED<br />
CARBON<br />
MODULUS OF<br />
ELASTICITY<br />
X IOE6 LB/IN2<br />
f3 - 16<br />
10.5 -<br />
16.9<br />
32<br />
50<br />
90<br />
48 - 57<br />
2.5 - 4.0<br />
1.04 -<br />
4. !<br />
2.9 - 4.4<br />
2 2.3<br />
TENSILE STRENGTH<br />
X IOE3 LB/IN2<br />
65 - 120<br />
20 - 45<br />
20<br />
39<br />
123.25<br />
20.65<br />
8 - 8.6<br />
8 - 8.6<br />
7.5 - 9<br />
2<br />
CO-EFFICIENT OF<br />
THERMAL EXPANSION<br />
X IOE-6 IN/IN F<br />
6.6<br />
6.5 - 6.8<br />
3.9<br />
4.3<br />
2.66<br />
1 .06<br />
2. 1 - 2.7 2. ! - 2.7 2.4 - 3, 1<br />
2.4 - 3.2<br />
THERMAL<br />
CONDUCTIVITY<br />
BlU.FT/H X FT2 F<br />
23 - 29<br />
25 - 26<br />
8.5<br />
14.5<br />
4 ! - 4S<br />
41-60<br />
6-9<br />
6-9<br />
8 - g.5<br />
30<br />
DENSITY L8/IN3<br />
0.259 -<br />
0.268<br />
0.264 -<br />
0.268<br />
0, 123<br />
0.13?<br />
0.59<br />
0.104<br />
0.064 -<br />
0.069<br />
0.0ft3 -<br />
0. 1 12<br />
0.083 -<br />
0.097<br />
0.06 -<br />
0.070<br />
HARDNESS<br />
BRINELL-"--<br />
ROCKWELL A-<br />
----ROCKWELL 45N---<br />
- — --SHORE<br />
ROCKWEtL IS!<br />
^!7 - 269 !31 - 183<br />
»? 8? 93<br />
66 - 88 80-105<br />
60-95 70 -
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