5.8.1 Mechanical seal options
Pumps are usually shipped with mechanical seals installed. If they are not, then refer to the mechanical
seal manufacturer's installation instructions.
These are the mechanical seal options for this pump:
•
Cartridge mechanical seal
•
Conventional inside component mechanical seal
5.8.2 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 illustra-
tions shipped with the seal.
Seal flushing methods
Table 10: 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 0.35 to 1.01 kg/cm
2
| 5 to 15 psi greater than the seal chamber
pressure. The injection rate must be 2 to 8 lpm | 0.5 to 2 gpm.
Other
You can use other methods that employ multiple gland or seal chamber connections. Refer to the me-
chanical seal reference drawing and seal flush/cooling piping diagrams.
5.8.3 Packed stuffing box option
WARNING:
Packed stuffing boxes are not allowed in an ATEX-classified environment.
The factory does not install the packing, lantern ring, or split gland.
These parts are included with the pump in the box of fittings. Before you start the pump, you must install
the packing, lantern ring, and split gland according to the Packed stuffing box maintenance section in the
Maintenance chapter.
5.8.4 Connection of sealing liquid for a packed stuffing box
NOTICE:
Make sure to lubricate the packing. Failure to do so may result in shortening the life of the
packing and the pump.
You must use an external sealing liquid under these conditions:
•
The pumped fluid includes abrasive particles.
•
The stuffing-box pressure is below atmospheric pressure when the pump is running with a suction
lift or when the suction source is in a vacuum. Under these conditions, packing is not cooled and
lubricated and air is drawn into pump.
5.8 Shaft-sealing options
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Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual
Содержание GOULDS PUMPS 3180
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