BOC Edwards iH600 - Materials in Contact with Process Gases; Fire Safety

Purge flows
Flow rates
slm Pa.ls
-1
Typical
nitrogen flow
rates
(high gas
configuration:
factory set)
2/3-interstage purge * 5 8.44 x 10
3
3/4-interstage purge * 30 5.06 x 10
4
Shaft-seals purge 4 6.76 x 10
3
Exhaust-purge 5 8.44 x 10
3
Maximum total flow without inlet-purge 44 7.44 x 10
4
Inlet-purge 25 4.22 x 10
4
Maximum total flow with inlet-purge 44 7.44 x 10
4
Maximum
nitrogen flow
rates
2/3-interstage purge * 10 1.69 x 10
4
3/4-interstage purge * 30 5.06 x 10
4
Shaft-seals purge 10 1.69 x 10
4
Exhaust-purge 10 1.69 x 10
4
Maximum total flow without inlet-purge 60 1.01 x 10
5
Inlet-purge 30 5.06 x 10
4
Maximum total flow with inlet-purge 60 1.01 x 10
5
* With inlet purge off. When inlet purge is on, these flow rates will be lower.
Table 2-3 - Nitrogen purge flow rates: high gas configuration
2.8 Materials in contact with process gases
Pump, shafts and rotors Cast iron, steel, SG iron
Internal and external shaft-seals
HCDP pump PTFE (polytetrafluoroethylene)
HCMB pump (iH600/iH1000 only) PTFE and fluoroelastomer
HCDP pump nitrogen pipelines Stainless steel
Gas module nitrogen components (pipelines,
manifolds, valves, pressure transducers and Brass, stainless steel, aluminium,
so forth) Viton, nickel
2.9 Fire safety
The iH pump series has been assessed to UL3101, CSA22.1 and EN61010 standards for fire
safety. The use of combustible materials has been minimised, potential ignition sources have
been contained within sealed metal enclosures and engineering controls have been used to
avoid ignition or over temperature situations.
2-16 iH Dry Pumping Systems