Flowserve VPK10 - Manual (Page 11)

11
Operation
continued
■ Please take into account that ultrasonic sources, such as pumps or steam reducing
stations, in the proximity of the steam trap to be tested might falsify the result. In
this case “steam loss” might be indicated even though the traps operate correctly.
This can be verified by scanning the adjacent pipelines. If the reflection remains
unchanged or increases, this must be attributed to a foreign ultrasonic source. If
possible switch off sound emitting plant components.
■ Intermittently operating steam traps cause recurrent meter deflections which might
even reach the end of the scale. Thermostatic traps (with bimetallic control or
membrane regulators) may operate within the specified pressure and flowrate
range either continuously or intermittently. In this case steam loss can usually be
excluded. A recurrent meter deflection indicates here correctly operating steam
traps.
■ Thermodynamically controlled steam traps always operate intermittently over the
complete flowrate range and might thereby cause steam loss which rises with
increasing lift frequency. A clear evidence of loss is only given by a constantly large
meter deflection.
■ Basically the same considerations as mentioned for thermodynamic traps also
apply in the case of steam traps with open floats. However, with float-operated traps
inherent steam loss will definitely occur even when the trap operates intermittently.
■ Before performing the tests at least an estimation should be carried out with the aid
of technical plant data (service pressures, differential pressures, flowrates etc.) so
as to ascertain whether the trap flowrate lies within the range that permits testing.
Notice
Maintenance
Plug the battery charger into the display device . The red and the green LED of
the battery charger light up: red = charging.
For a full charge leave the charger plugged into the mains supply for approx. 14 hours.
Recharging battery
Under normal operating conditions the integrated battery has a service life of 5 to 7
years. Should the battery be faulty, please return the equipment to GESTRA GmbH in
Bremen for replacement.
Replacing battery
■ Note that the 9 V NiCd battery of the display device must only be
replaced by the manufacturer!
Attention
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