10 Operation
10.3 During operation
10.3.2
Monitoring filters and/or strainers
Personnel qualification:
o
Trained personnel
1.
After commissioning monitor the degree of contamination of the filter and/or strainer by means of
a suction-side pressure gauge or a differential pressure indication.
2.
Additionally check the filters and/or strainers at a pressure drop on the suction side. Observe the
dimensioning data of the manufacturer of the filters/strainers.
3.
Check the suction-side pressure every two weeks during running operation.
10.3.3
Adjusting the overflow valve
Personnel qualification:
o
Fitter
Aids:
o
Hexagon key
Notice
The opening pressure of the overflow valve is set to 110% of the differential pressure in the factory.
WARNING
Risk of injury through emitted pumped liquid.
Pumped liquids can be hot, poisonous, combustible and caustic.
► Wear personal protective clothing during all the work. Ensure face protection.
► Collect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
1
2
2
Fig. 11: Overflow valve (fig. left: integrated / fig. right: external)
1
Screw plug
2
Adjusting screw
Requirement:
ü
Pressure-side pressure gauge installed
1.
At an integrated overflow valve remove the screw plug
1
.
2.
Switch on the pump and increase the supply pressure step-by-step to check the opening pres-
sure of the overflow valve. Keep an eye on the pressure gauge and make sure that the operating
limits are observed.
ð
The opening pressure is reached, when the displayed pressure falls.
3.
Turn the adjusting screw
2
to set the opening pressure:
Turning clockwise: Increase the opening pressure
Turning counter-clockwise: Reduce the opening pressure
4.
Repeat Steps 2 and 3 until the desired opening pressure is reached.
5.
At an integrated overflow valve retighten the screw plug
1
.
24
OIC 01en-GB Edition 2019-11
Operating instructions
