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3.18.6.3 Isolating valves
To allow proper maintenance it is necessary to be able to isolate the pump. Isolation can be done by
installing valves in suction and discharge lines.
•
These valves must have a cylindrical passage
of the same diameter of the piping (full bore).
(Gate or ball valves are preferable).
•
When operating the pump, the valves must be opened
completely. The output must never
be regulated by means of closing
valves in suction or discharge
pipes.
It must be regulated by changing
shaft speed or by re-routing the
media over a by-pass back to the
supply tank.
3.18.6.4 Strainer
Foreign particles can seriously damage the pump. Avoid the entry of these particles by installing a
strainer.
•
When selecting the strainer attention should be given to the size of the openings so that
pressure losses are minimised. The cross-sectional area of the strainer must be three times that
of the suction pipe.
•
Install the strainer in such a way that maintenance and cleaning are possible.
•
Make sure that the pressure drop in the strainer is calculated with the right viscosity. Heat the
strainer if necessary to reduce viscosity and pressure drop.
For the maximum allowable particle size see section 3.15.
3.18.7 Secondary piping
For dimensions of connections and plugs see chapter 6.0.
3.18.7.1 Drain lines
The pump is provided with drain plugs.
Be
A.0500.501 – IM-TGGS/05.01 EN (03/2013)
de
Ba
Bk
By-pass
Suction
Bb
Be
Bn
Ba
Bk
Discharge
Piping
de
33
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