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Document: U99_001
Pressure pipe
The pressure pipe must be fitted with a gate valve and a non-return- valve.The gate valve renders possible to set a
special flow rate while water hammers in pipes at the occasion of switching off the pump are avoided by means of
the nonreturn valve. Moreover the non-return-valve is a safety device which allows dismantling the aggregate
without draining the pressure line.
Data of measurement points
Tests on centrifugal pumps are carried out according to DIN EN ISO 9906:2013-3. The velocity in the measurement
pipes should not be above the data mentioned at the beginning. Taper pieces must be used for higher velocities.
Elbows, valves, taper pieces etc. should be mounted behind the pressure measurement points. Therefore these
parts should not be too close at the pressure measurement points.
To receive reliable measurement data at the plant, a pressure measurement should be
made, considering the afore mentioned flow velocities and the construction according
to DIN EN ISO 9906:2013-3.
The arrangement for the flow measure system has to be according to the instructions of the supplier.
5.4.3
Pressure tests
Before mounting the piping to the pump, reservoirs, pipeline and connections must be
cleaned thoroughly, scoured out and, if medium makes it necessary, blown through.
The conduits must be leak tested without the pump. Otherwise the pump may be damaged.The mounted pump is normally
tested statically under the 1.5-fold of the maximum pressure of the delivered pump.
5.5 Installation- and assembly instructions for emission-decrease
Pay attention to screw connections during installation- and assembly works.
9.3 Tightening torques
Hazards by vibrations and noise emissions
Check that all screws/connections are tightened!
Make sure, that tightening torques of screws are according to valid instructions!
Disregarding of these instructions can result in extended vibrations and extended noise pollution with consequent physical
and emotional damages.
5.6 Protection
5.6.1
Mechanical
Normally, the safety devices at the product must not be removed.
Dismantle pump only, if power supply is down, to do maintenance works.
Hazard by touching/catching at sudden start-up of shaft
Put aggregate out of service!
Secure against unintended restart!
Indications to power supply under
5.7. Connection to power supply
After these works and before starting machine reinstall all safety devices.
Used safety devices: (execution-specific)
Touch guard at bearing pump side
Touch guard at bearing drive side
Coupling guard between bearing and motor