•
Sealing systems that are not self-purging or self-venting, such as plan 23, re-
quire manual venting prior to operation. Failure to do so will result in excess heat genera-
tion and seal failure.
•
Follow seal manufacturer's guidelines for proper seal installation procedures.
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 manufactur-
er and require no field settings. Cartridge seals installed by the user require disengagement of the hold-
ing 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, however
this should be verified by the customer prior to start-up.
Customers should always check to make sure the clips have been disengaged prior to starting the pump.
Other mechanical seal types
For other types of mechanical seals, refer to the instructions provided by the seal manufacturer for instal-
lation and setting.
5.6 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 6: 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 pres-
sure. 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 cham-
ber connections. Refer to the mechanical seal reference drawing and
piping diagrams.
5.7 Pump priming
5.6 Connection of sealing liquid for mechanical seals
Model 3700, 3703, 3710, 3700LF, 3700LFI API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Instal-
lation, Operation, and Maintenance Manual
55
Summary of Contents for Goulds Pumps 3700
Page 2: ......
