Commissioning, Startup, Operation, and Shutdown
NOTICE:
•
Leakage of process liquid may result in creation of an explosive atmosphere. Follow all
pump and seal assembly procedures.
•
The mechanical seal must have an appropriate seal-flush system. Failure to do so will
result in excess heat generation and seal failure.
•
Cooling systems such as those for bearing lubrication and mechanical-seal systems
must be operating properly to prevent excess heat generation, sparks, and premature
failure.
•
Sealing systems that are not self-purging or self-venting, such as plan 23, require
manual venting prior to operation. Failure to do so will result in excess heat generation and
seal failure.
•
Packed stuffing boxes are not allowed in an ATEX-classified environment.
Shipping
Pumps may be shipped with or without a mechanical seal installed.
Cartridge-type mechanical seals
Cartridge-type mechanical seals are commonly used. Cartridge seals are preset by the seal
manufacturer and require no field settings. Cartridge seals installed by the user require
disengagement of the holding clips prior to operation, allowing the seal to slide into place.
If the seal has been installed in the pump by ITT, these clips have already been disengaged.
Other mechanical seal types
For other types of mechanical seals, refer to the instructions provided by the seal manufacturer
for installation and setting.
Connection of sealing liquid for mechanical seals
Seal lubrication is required
Seal faces must have liquid film between them for proper lubrication. Locate the taps using the
illustrations shipped with the seal.
Seal flushing methods
You can use these methods in order to flush or cool the seal:
Method
Description
Product flush
Run the piping so that the pump pushes the pumped fluid from the casing and
injects it into the seal gland. If necessary, an external heat exchanger cools the
pumped fluid before it enters the seal gland.
External flush
Run the piping so that the pump injects a clean, cool, compatible liquid directly into
the seal gland. The pressure of the flushing liquid must be 5 to 15 psi (0.35 to 1.01
kg/cm
2
) greater than the seal chamber pressure. The injection rate must be 0.5 to
2 gpm (2 to 8 lpm).
Other
You can use other methods that employ multiple gland or seal chamber
connections. Refer to the mechanical seal reference drawing and piping diagrams.
Pump priming
WARNING:
These pumps are not self priming and must be fully primed at all times during operation. Loss of
prime can lead to excessive heat and severe damage to the pump and seal.
Model 3610, API Type BB1 API 610 11th Edition Installation, Operation, and Maintenance Manual
47
