Goulds Pumps AF (Axial Flow) (6"-36) MXR Bearings" - Manual (Page 36)

34 AF (6-36) IOM
unit and refer to driver manufacturers instructions
for assistance.
5 Pumpage temperatures 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, reprime and
attempt to restart
.
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.
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 not
known, it should be measured with a pressure gauge
when the pump is operating.
The 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.
(Double 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
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.
OPERATION
GENERAL CONSIDERATIONS
Service temperature in an ATEX classified
environment is limited by the table in the
ATEX identification section.
Do not operate pump below
minimum rated flows or with suction
and/or discharge valve closed.
These conditions may create an explosive hazard due
to vaporization of pumpage and can quickly lead to
pump failure and physical injury.
Observe pump for vibration levels,
bearing temperature and excessive
noise. If normal levels are exceeded,
shut down and resolve.
Always operate the pump at or near
the rated conditions to prevent
damage resulting form cavitation or
recirculation.
Always vary capacity with regulating
valve in the discharge line. NEVER
throttle flow from the suction side.
Pump must never be throttled on
suction side.
NPSHa must always exceed NPSHr
as shown on Goulds performane
curves received with order.
Reference Hydraulic Institute for NPSH and pipe
frictionvalues needed to evaluate suction piping.
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