SPX TG H15-50, Instruction Manual, Page: 21 / 110

21 A.0500.351 – IM-TGH/07.02 EN (10/2015)
Maximum temperature (°C) of rotor bush bearing material and
intermediate casing material combinations
Pump size TG H
Bush on shaft materials (°C)
Casing R – Stainless steel Casing S – Steel Casing N – Nodular iron
C H U B S*) C H U B S*) C H U B
2-32 200 200 200 200 - - - - - - - - - -
3-32 200 200 200 200 - - - - - - - - - -
6-40 250 150 240 250 300 280 260 240 300 - - - - -
15-50 250 150 240 250 300 280 280 240 300 300 300 300 240 300
23-65 250 150 240 250 300 280 280 240 300 300 300 300 240 300
58-80 250 150 240 250 300 280 280 240 300 300 300 300 240 300
86-100 250 150 240 250 300 280 280 240 300 300 300 300 240 300
185-125 250 150 240 250 300 280 280 240 300 300 300 300 240 300
360-150 250 150 240 250 300 280 280 240 300 300 300 300 240 300
*) Remark: Hardness relief of steel bush (S) and hardened steel shaft (2) above 260°C
3.10.3 Operation under hydrodynamic lubrication conditions
Hydrodynamic lubrication could be important criteria for bush material selection.
If the bush bearings are running under the condition of hydrodynamic lubrication there is no more
material contact between bush and pin or shaft and the lifetime cycle is increased importantly.
If there is no condition for hydrodynamic lubrication, the bush bearings make material contact with
pin or shaft and the wear of these parts is to be considered.
The condition of hydrodynamic lubrication is fulfilled
with the following equation:
Viscosity * shaft speed / diff.pressure
≥
K.hyd
with: viscosity [mPa.s]
shaft speed [rpm]
diff.pressure [bar]
K.hyd = design constant for each pump size.
TG H pump size K.hyd
2-32 6000
3-32 7500
6-40 5500
15-50 6250
23-65 4000
58-80 3750
86-100 3600
185-125 2500
360-150 2000
3.10.2 Maximum temperature of internals
For some material combinations the general temperature performances must be limited.
The maximum allowable working temperature of internals depends on the combination of used
materials and their thermal expansions and the interference fit to hold the bearing bush fixed.
• Some bush bearings have an extra locking screw. In this case the maximum allowable
temperature is based on the most probable interference fit.
• In case the bearing bush has no locking screw because material and construction do not allow
concentrated stress the maximum allowable temperature is based on the minimum interference
fit.
Maximum temperature (°C) of idler bush bearing material and idler material
combinations
TG H pump size
Bush and Idler materials (°C)
Cast iron idler G Steel idler S Stainless steel idler R
SG*) CG BG HG SS*) CS BS HS US BR CR HR UR
2-32 - - - - - - - - - 200 200 200 200
3-32 - - - - - - - - - 200 200 200 200
6-40 300 280 240 240 300 250 300 200 240 300 250 200 240
15-50 300 280 240 240 300 250 300 200 240 300 250 200 240
23-65 300 300 250 240 300 280 300 200 240 300 280 200 240
58-80 300 300 250 240 300 280 300 200 240 300 280 200 240
86-100 300 300 250 280 300 280 300 240 240 300 280 240 240
185-125 300 300 250 300 300 280 300 260 240 300 280 260 240
360-150 300 300 250 300 300 280 300 260 240 300 280 260 240
*) Remark: Hardness relief of steel bush (S) and hardened steel pin (2) above 260°C