Model: PWD Rev. B_12/2/2015
operation. Heating time should be not
over 100°F per hour of temperature
change until the case reaches within
100°F under the product temperature.
The case should be allowed sufficient
time to normalize in temperature. As a
rule of thumb, allow a minimum of 1
hour per inch of thickness at the thickest
point of the case (normally the parting
flange). If the components are heated
too rapidly and/or the components are
not given enough time to normalize in
temperature, warpage due to uneven
thermal expansion can cause the rotor
to bind in the internal stationary rings.
Starting in this condition could damage
the internal components. Heating is
usually performed with a warm-up or
bypass line. The suction valve is to be
open as not to over pressure the case.
Open the warm-up line to allow a small
amount of hot fluid to circulate through
the pump.
11) Ensure all guards are in place at the
coupling and over seal glands, as
applicable.
STARTUP PROCEDURES
Pump should be vented at the high points of
the casing, suction and seals prior to operation.
Failure to properly vent entrapped air can cause
damage to the mechanical seals and pump
internals.
With the discharge valve closed, slowly
open the suction valve and allow product to
enter the pump. Open vent valves to remove all
air from the pump. Unit will be fully vented when
fluid runs clear with no bubbles.
Once the pump is primed, If no bypass valve
or line is used, set the discharge valve at 10%
open. If a minimum flow bypass line or actuator
valve is used for start-up purposes, the
discharge valve may be closed. Ensure that
valves on the minimum flow line are open.
Note: When the pump is located above
suction source the discharge valve
cannot be opened until the drive has
been started since this would cause
loss of prime.
Start the pump. As soon as it begins to
develop pressure, start slowly opening the
discharge valve. Avoid making any abrupt
change in discharge velocity in order to prevent
surging within the piping. Surging can cause
serious damage to the internals of the pump.
The pump should reach discharge pressure
as soon as it reaches operating speed. If does
not happen, shut the pump down immediately.
Re-vent and prime the pump and try re-starting.
START-UP INSPECTION
Pull bearing housing inspection plugs and
check the slinger rings at the bearings to insure
that they are rotating and picking up oil. If any of
them are not, shut the unit down immediately
and investigate the cause of the problem.
1) For auxiliary oil systems, check oil flow
through sight flow indicators in the drain
lines.
2) Check for seal leakage. If a minor leak
does not stop after a few minutes of
operation, shut the unit down and re-set
seal.
Seal failure can cause a
mechanical spark. Follow preventative
maintenance schedule.
3) Check for leaks in all the piping, vents
and drains, suction and discharge, lube
oil, etc.
4) Monitor bearing housing and oil
temperatures to ensure proper bearing
and oil temperatures. Shut down if there
is a sudden temperature rise, or if
temperatures continue to rise past the
desired operating range.
5) Monitor oil levels and ensure that there
is no leakage at the bearing isolators.
6) On auxiliary oil systems, observe during
startup to ensure auxiliary pump to main
pump cutover. Monitor oil pressures to
ensure constant and within the proper
operating parameters.
7) Monitor differential pressures across the
filters on auxiliary oil systems. Change
filters as necessary.
8) Monitor differential pressure across the
suction strainer. Shutdown and clean as
necessary if there is an increase of 5
psig or more.
9) Monitor vibration readings, especially
those attributed to misalignment. A hot
alignment may be necessary to adjust
for thermal growths.
10) Monitor vibration readings, especially
those attributed to misalignment. A hot
alignment may be necessary to adjust
for thermal growths.