Start-up / shut-down
31
BA.10A.CNY.001.01.10.GB
5.1.3 Functional check of mechanical seal
Check the function of the mechanical seal in this way:
1. Watch the pump and check the mechanical seal for flaw-
less functioning (leak test).
An intact mechanical seal works virtually without leakage.
If liquid pumped or flushing liquid leak:
1. Switch off the pump.
2. Renew the mechanical seal.
Observe section 6.1on 32.
5.2 Shut-down
5.2.1 Shutting down the pump
C A U T I O N
!
Danger of pressure surge!
Pressure surge can cause damage to pump or plant. Quick
closing of shut-off devices on discharge side can cause a
pressure surge.
•
Always close shut-off devices (gates, valves) slowly!
What is a pressure surge?
A pressure surge is an abruptly pressure increasing in the
system. This pressure increasing can - among other causes -
be caused by a quick blocking of the flow in the discharge
pipe. In case of a pressure surge, the maximum permitted
pump pressure is temporarily exceeded manifold.
Shut down the pump in this way:
1. Close the check valve on the discharge side.
2. Switch off the pump.
3. Close the check valve on the suction side.
4. Switch off the flushing system
1
.
5. Make sure that the pump is depressurised.
6. Switch off pressure in barrier system
2
.
5.2.2 Cleaning pump after shut-down
C A U T I O N
!
Danger of jamming.
Sticky or highly viscous liquids can damage the pump after
shut down.
•
Clean the pump appropriately after shut down.
See section 2.11 on 10.
1.
only for double mechanical seal or quench design
2.
only for back-to-back arrangement
