Operation
49
300407956_002_C1 - 01/2017 - © Leybold
Process pump recovery after pump failure
In the event of a process pump stopping during a process step there is risk
that the pump could contain hazardous materials, the following procedure
should be followed in order to minimise the risk to people and property.
If the pump has previously pumped hazard ous gases observe Safety
Information in Section 0.4.
■
Interlock the process valve to close when the process pump stops.
■
Vent the system with dry purge gas to atmospheric pressure.
■
Shut off the purge.
■
Disconnect the pump exhaust and fit a metal ISO / NW blanking plate.
■
Disconnect the pump inlet and fit a metal ISO / NW blanking plate.
■
Disconnect the purge gas supply and seal.
■
The pump can now be removed to a workshop for decontamination and
repair.
4.4 Removing from Service
Shut off and vent the pump system as described above.
Clean the pump system of any substances which may lead to corrosion. (e.g.
by extended purge).
Flood it with nitrogen or dry purge gas, add desiccant and seal it.
Remove the cooling water from the pump system.
Remove the cooling water hoses from the pump and drain the cool ing water.
Blow out the cooling water coils with compressed air or Nitrogen (
max. 4
bar
). Blow into the cooling water inlet port only.
Drain the lubricant (PFPE or synthetic oil) out of the pump (cf. Fig. 5.1).
DANGER
Drain cooling water
Drain lubricant
