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2.3.5.3. Discharge piping (Fig. 6)
A control valve should be installed in the discharge pipe, as close to the pump as possible, to regulate the required
flow and head.
If the total head of the pump exceeds 10 meters or if discharge line is of appreciable length a non return valve should
be installed between the pump and isolating valve on the discharge line to protect the pump against water hammer
and reverse flow on shut down.
Fig. 6a. Suction Lift
2.3.5.4. Auxiliary Connections
Depending on the application auxiliary pipe connection (drainage etc. necessary for
the pumping system) and/or accessories to check the operating conditions (pressure
gages, temperature gages etc.) may be made up and laid.
Pressure and vacuum gauges must be properly anchored and connected at the
measuring points located on the pipes approximately 2D close to the flanges
with approximately 8 mm diameter tubing with pig tail configuration to lessen
pressure fluctuation. For safety purposes isolating and vent valves should be
fitter before the gauges (Fig. 7).
Every pump is fitted with connection on the pump casing to drain the pump (Fig.
8). If required the pump drain can be piped to a suitable reservoir. The pump
draining piping must be fitted with an isolating valve and both must be suitable
for the maximum operating pressure of the pump.
Cooling, sealing and flushing of seal piping must be connected only to the
designated connections located on the pump (See Fig. 8 to 12).
Fig. 6b. Suction Head
15
Fig.7
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