Goulds Pumps API 3171 - IOM - Manual (Page 35)

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 sealless 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.
Set the impeller clearance - dial indicator method
WARNING:
Always disconnect and lock out power to the driver before you perform any installation or maintenance
tasks. Failure to disconnect and lock out driver power will result in serious physical injury.
1. Remove the coupling guard.
2. Set the indicator so that the button contacts either the shaft end or the face of the coupling.
Commissioning, Startup, Operation, and Shutdown
Model API 3171 Installation, Operation, and Maintenance Manual 33