Flowserve LPNV Worthington - Manual (Page 23)

LPNV USER INSTRUCTIONS ENGLISH 87900031 – 06/14
Page 23 of 48
5 COMMISSIONING, START-UP,
OPERATION AND SHUTDOWN
The following procedures are presented to outline
the most important steps involved in pump
operation. Any modification of these procedures
due to particular installation peculiarities should
conform to good engineering practices.
Never operate the pump with
suction valve closed.
Never operate the pump unless it is
filled with liquid and vented .
Never operate the pump unless a
liquid source is available.
Never operate the pump with
discharge valve closed or below the minimum
specified flow rate. If reduced capacity operation is
required on occasion, a recirculation line should be
installed according FLOWSERVE
recommendations.
Where possible avoid severe
thermal shocks due to sudden changes of liquid
temperature. Warm-up the pump at all times
before start-up if the pumped liquid is hot or
subject to crystallize
Lubricate the unit prior to starting.
Do not operate the unit unless coupling
guards are bolted in place .
Never operate the pump above the
name plate conditions.
During pump operation, keep the
vent and drain valves in closed position, to prevent
any liquid from a high pressure point flowing into a
low pressure point.
Do not wipe down in the vicinity of rotating
parts. If unusual noise or high vibrations occur,
secure the pump as soon as possible.
5.1 Pre-commissioning procedure
The following steps should be followed at initial
start up and after the equipment has been
overhauled:
a) Prior to installing the pump, flush the suction
side of the system to remove all deposit (slag,
bolts etc).
b) Ensure the pump and piping is clean. Before
putting the pump into operation, the piping
should be thoroughly back flushed to remove
any foreign matter which may have
accumulated during installation. Take all
possible care not to contaminate your system.
c) Install suction strainer if required. (See Section
4.4.2.1).
d) Activate lubrication; fill the bearing housings
with the appropriate oil to the correct level.
Bearing must receive a small amount of oil
prior to starting to ensure adequate lubrication
at start up. (Refer to Section 5.1.1).
e) Turn pump rotor by hand or with a strap
wrench to make sure it turns smoothly.
f) Assure that correct seal piping has been
installed and has not been damaged.
g) If the pump is fitted with mechanical seal,
ensure it is correctly assembled and tightened.
Most cartridge seals are
equipped with a spacer between the gland
plate and drive collar. This spacer must be
removed before starting unit.
h) Prior to coupling installation, bump start motor
to check for correct rotation. If rotation is not
correct refer to motor manual for appropriate
connections to
change rotation (Shut down all
power prior to change).
i) Ensure coupling is correctly aligned and
lubricated, and pump and driver is
satisfactorily doweled. (Refer to Section 4.3).
The unit must not be operated unless
coupling guard is securely and completely
bolted in place. Failure to observe the warning
could result in injury to operating personnel.
j) Check torque of all bolting and the plugs for
tightness.