Goulds Pumps AF (Axial Flow) (42"/1200mm/54/60"/66") LM/LMR Bearings - IOM" - Manual (Page 35)

AF (42-66) IOM 35
STARTING THE PUMP
PRIMING PUMP
Pumps that are not self-priming must be fully
primed at all times during operation.
Start up Precautions
1. All equipment and personal safety related devices
and controls must be installed and operating properly.
2. To prevent premature pump failure at initial start
up due to dirt or debris in the pipe system, ensure the
system has been adequately cleaned and flushed.
3. Variable speed drivers should be brought to rated
speed as quickly as possible.
4. Variable speed drivers should not be adjusted or
checked for speed governor or overspeed trip settings
while coupled to the pump at initial start up If settings
have not been verified, uncouple the unit and refer to
driver manufacturers instructions for assistance.
5. Pumpage tempartatures in excess of 200°F will
require warmup of pump prior to operation. Circulate a
small amount of pumpage throught the pump until the
casing temperature is within 100°F of the pumpage
temperature and evenly heated.
When starting pump, immediately observe
pressure gauges. If discharge pressure is
not quickly attained, stop driver, re-prime and
attempt to restart
.
6. Never start the pump until it has been properly
primed. Check the pump impeller for submergence.
The pump must be full of liquid with specified
submergence head above the impeller. Do not run the
pump dry, as this might damage pump and seal
components.
7. Lubricating liquid must be flowing to the stuffing
box before pump is started.
FLUSH FLOWS
Packing or mechanical seals are used to seal the
rotating shaft. Generally, a clear liquid such as water
is used to lubricate and cool the sealing elements. The
lubricating liquid pressure must be 10 -15 psi higher
than the pressure inside the elbow to prevent pumpage
from entering the sealing elements. The lubricating
liquid must be clean and free of grit. Shaft scoring,
packing destruction, and mechanical seal face damage
will result from contaminated lubricant.
The stuffing box may be on the suction or the
discharge side of the impeller, depending on the
direction of flow through the elbow ordered by the
customer. If the pressure inside the elbow is unknown,
it should be measured with a pressure gauge when the
pump is operating. The standard stuffing box is
furnished with (2) N.P.T. holes for piping the lubricating
liquid. The lubricating liquid is piped into one of them.
Some users simply plug the other hole. For additional
cooling of the sealing elements, an outlet pipe with a
valve can be installed to allow more liquid to flow
through the stuffing box.
For special (6) row packing arrangement see appendix
1 at the end of this manual for flush pressures and flow
rates.
(Mechanical seals have no leakage and usually require
a lubricant flow through the stuffing box for cooling).
The lubricating flow should be regulated by the valve in
the outlet pipe rather than by throttling the flow in the
supply pipe.
DRIVER
Start driver.
CAUTION
Immediately observe pressure gauges. If discharge
pressure is not quickly attained-stop driver, check
submergence level and attempt to restart
SET DESIRED FLOW
If your system is equipped with a variable frequency
drive (VFD) or a variable speed V-belt drive, you may
at this point want to set your speed for the desired flow.
CAUTION
Observe pump for vibration levels, bearing
temperature and excessive noise. If normal levels are
exceeded shut down and resolve.
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