Flowserve NMD - Manual (Page 18)

NMD, NMAD USER INSTRUCTIONS ENGLISH 71576436 - 11/09
Page 18 of 40
Except when explicitly required by the customer in
the specifications, when a possibility of reverse
rotation exists the customer must install a reverse
rotation protection device.
The customer must install all equipment required to
avoid water hammer.
5 COMMISSIONING, START-UP,
OPERATION AND SHUTDOWN
These operations must be carried out by
fully qualified personnel.
5.1 Direction of rotation
Starting or operating pumps with the
wrong direction of rotation can be harmful to the
pumps. Ensure that the pump rotation is the same
as the arrow on the pump casing.
It is preferable to check the direction of rotation
before installing the coupling. If not, the pump must
be filled in with the liquid before start-up.
If maintenance work has been carried
out to the site's electricity supply, the direction of
rotation should be re-checked as above in case the
supply phasing has been altered.
5.2 Guarding
Guarding is supplied fitted to the pump set.
If this has been removed or disturbed ensure
that all the protective guards around the pump
coupling and exposed parts of the shaft are securely
fixed.
5.3 Priming and auxiliary supplies
Where there is any risk of the pump being run
against a closed valve generating high liquid and
casing external surface temperatures it is
recommended that users fit an external surface
temperature protection device.
Ensure all electrical, hydraulic,
pneumatic, sealant and lubrication systems (as
applicable) are connected and operational.
Ensure the inlet pipe and pump
casing are completely full of liquid before starting
continuous duty operation.
These operations must be carried out by personnel
with approved qualifications.
5.3.1 Priming of a flooded pump
a) As discharge valve is closed, fill the pump by
opening the valve at suction. Let air escape by
removing the plugs located on the pump.
b) If the discharge pipe is headed and there is a
by-pass valve on the non-return valve, open
slightly the discharge valve and the by-pass of
the non-return valve.
c) When the pump is totally free of air bubbles,
replace the plugs.
Air escape
Priming of a flooded pump
5.3.2 Priming of a sump suction pump
* With foot valve:
a) Fill suction pipe and casing with liquid from an
independent source (pressure 1 to 2 bars).
b) Let air escape by removing the plugs located on
the pump.
c) When the pump is totally free of air bubbles,
replace the plugs.
Air escape
EXTERNAL SOURCE
Priming of a sump suction pump with foot valve Priming of a sump suction pump with foot valve