Figure 21: Without vacuum pump
5.4.1 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.
5.4.2 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 pump-
ing is normal.
Follow the same sequence for the Model 3500XD for units without a vacuum pump when the consistency
is 10% and lower.
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 haz-
ard due to vaporization of pumpage and can quickly lead to pump failure and physical injury.
5.4 Seal/vacuum flush
30
3500XD Installation, Operation and Maintenance Instructions
Содержание Goulds Pumps 3500XD
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