Check Expansion Vessel Pre-Charge - FLOWTECH flowpress WMDA Operation And Maintenance Manual

Check Expansion Vessel Pre-Charge

Many of the problems experienced with pressurisation equipment can be traced back to the expansion
vessel.
The expansion vessel pre-charge pressure must be checked after 2 years and annually thereafter.
To perform this test, the expansion vessel must first be drained of water, then a gauge can be connected to
the Schrader valve on the vessel to measure the pre-charge pressure. The pre-charge should be equal to the
[COLD FILL] pressure setting.
The pressure can be increased using a foot pump, air compressor or pressurised air/nitrogen cylinder.
If any faults are identified during these checks, please refer to the Troubleshooting section of this manual.
flowpress
WMDA Pressurisation Units
25