Goulds Pumps 3180-86 - IOM - Manual (Page 47)

Cold temperature axial clearance for the open and closed impeller
For pumped liquid temperatures over 122°F (50°C), the cold setting must be increased to the values in this
table. This prevents the impeller from contacting the suction sideplate or wear ring due to shaft expansion
from the higher operating temperatures.
Temperature Clearance
122°F (50°C) 0.015 in. (0.38 mm)
212°F (100°C) 0.018 in. (0.45 mm)
302°F (150°C) 0.020 in. (0.50 mm)
392°F (200°C) 0.022 in. (0.55 mm)
446°F (230°C) 0.026 in. (0.65 mm)
Check the Shearpeller ™ axial clearance
The Shearpeller ™ requires a large front clearance in order to handle stringy solids. The front clearance
between the Shearpeller ™ and the suction sideplate is 0.375 in. (9.50 mm). With this large clearance, the
pump is not as sensitive to small changes in the front clearance. No cold setting is required with the
Shearpeller
™ option due to the large clearances.
1. Back the Shearpeller ™ up until the back pump-out vanes contact the seal chamber.
2. Move the Shearpeller ™ forward 0.062 in. (1.57 mm).
The total axial adjustment of the Shearpeller ™ between the suction sideplate and the seal chamber is 0.437
in. (11.00 mm).
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.
• If you use a cartridge mechanical seal, you must install the centering clips and loosen the set screws
before you set the impeller clearance. Failure to do so could result in sparks, heat generation, and
mechanical seal damage.
The clearance is set at 0.015 in. (0.4 mm) at the factory but could change due to piping attachment during
installation. A change in pump performance may be noted over time by a drop in head or flow or an
increase in power required.
Impeller clearance methods
You can set the impeller clearance with either of these methods:
• Dial indicator method
• Feeler gauge method
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
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual 45