Goulds Pumps 3171 - IOM - Manual (Page 33)

NOTICE:
• The mechanical seal must have an appropriate seal-flush system. Otherwise, excess heat generation
and seal failure can occur.
• 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.
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.
Shaft sealing with a stuffing box
This pump is a seamless design. Therefore, when temperatures exceed 180°F (82°C), you must move the
thrust bearing away from the heat source in the pump by adding the upper stuffing box. Air can then
circulate around the bearing in order to keep it cool.
The upper stuffing box is also used to minimize vapor emissions when the pump handles controlled
substances.
Steam jacket pumps (molten sulfur construction)
The steam jacketed connections are located on the support plate. The "steam in" line is connected to an
appropriate source of steam, and the "steam out/condensate" connections are made as dictated by the
installation requirements. A suitable trap should be used.
Impeller-clearance setting
Importance of a proper impeller clearance
A proper impeller clearance ensures that the pump runs at high performance.
WARNING:
• The impeller clearance setting procedure must be followed. Improperly setting the clearance or not
following any of the proper procedures can result in sparks, unexpected heat generation, and
equipment damage.
The clearance is set at 0.015 in. (0.4 mm) off of the suction cover at the factory, but could change due to
piping attachment.
Commissioning, Startup, Operation, and Shutdown (Continued)
Model 3171 Installation, Operation, and Maintenance Manual 31