Goulds Pumps 3500XD - IOM - Manual (Page 30)

PUMPING WATER OR LOW CONSISTENCY STOCK
The Model 3500XD pump system should be checked out
with water to make sure everything is operating in
accordance with all alarms and interlocks. When running with water the air removal valve is closed,
otherwise the system will operate the same as if pumping
stock.
PUMPING WITH STOCK - START UP PROCEDURE
Turn the seal water on to the mechanical seal (1 - 1½
GPM), the vacuum pump (2 GPM), and to the vacuum
chamber (1-2 GPM).
The control switches for the vacuum pump and the air
removal valve are in the automatic mode.
Fill the standpipe with water to a minimum level of 35%
with DCV-1 and DCV-2.
With the level control in the auto mode, set the level at
35%, start the Model 3500, and open the dilution valves
DCV-1 and DCV-2 to 100%.
The vacuum pump starts.
Begin adding stock to the standpipe. When the stock flow
to the standpipe is at normal production, slowly close the
dilution valves and switch the dilution controller to auto.
Gradually adjust the set point to the designated level for the
specific service leaving the level controller on automatic.
If the pump discharge pressure drops or pumping becomes
erratic, slowly increase the level until pumping is normal.
Follow the same sequence for the Model 3500XD for units
without a vacuum pump when the consistency is 10% and
lower.
s
! WARNING
Do not operate pump below minimum rated flows or
with suction and/or discharge valve closed or with
suction and/or discharge line blocked. These
conditions may create an explosive hazard due to
vaporization of pumpage and can quickly lead to pump
failure and physical injury.
s
! WARNING
Assure that the system operating conditions are within
the capabilities (e.g. – pressure, temperature, power,
etc.) of the pump. Exceeding any of the limits could
result in failure of components resulting in serious
physical injury and damage to equipment.
SHUTDOWN PROCEDURE
s
! WARNING
Do not operate pump below minimum rated flows or
with suction and/or discharge valve closed or with
suction and/or discharge line blocked. These conditions
may create an explosive hazard due to vaporization of
pumpage and can quickly lead to pump failure and
physical injury.
During brief shutdowns (approximately four hours or less),
it is usually sufficient to flush and drain the standpipe,
pump and control valve without displacing the stock in the
entire discharge line. During extended shutdowns (over
four hours), it is recommended to also flush and drain the
discharge line.
Stop the pulp flow to the standpipe. After the pulp is
pumped from the standpipe and the discharge piping has
been cleared of stock, the Model 3500XD can be shut
down.
During the shutdown sequence, the dilution system, air
removal valve and vacuum pump should be in the auto
mode. After the Model 3500XD is shut down, the air
removal valve and the vacuum pump switch should be
changed to the off mode.
The seal water to the mechanical seal and the vacuum
pump can be shut off. If the seal water to this mechanical
seal is left on, the standpipe can gradually fill up with
water.
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3500XD IOM 8/07