ITT Goulds Pumps API 3171, Installation, Operation And Maintenance Manual

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Product Description
Model API 3171 Installation, Operation, and Maintenance Manual 12
Product Description
General description
Product description
The Model API 3171 is a vertical submerged bearing sump and process pump that meets the
requirements of the 10th and 11th editions of API Standard 610 (ISO 13709).
This model is based on three bearing frames with 17 hydraulic sizes. The S/ST group has
identical bearings with a slightly different shaft on the impeller end for the S and ST. The M/MT
group is identical in all aspects for the power end. However, the liquid end of the MT is common
with the S group except that the MT is modified to accept a larger shaft. There are two MT sizes
that are common with the S/ST group.
This table shows the number of hydraulic sizes available for each drive-unit size group. Note
that each pump has a choice of two different discharge pipes which results in four
combinations.
Drive-unit size group Number of hydraulic sizes
S/ST 9
M/MT 8
L 2
WARNING:
Use of equipment unsuitable for the environment can pose risks of ignition and/or explosion.
Ensure that the code classifications on the pump are compatible with the specific environment
in which the equipment is to be installed. If they are not compatible, do not operate the
equipment and contact an ITT representative before proceeding.
Casing
The casing has these features:
• A tangential discharge
• Is self-venting
• Has an integral bearing retainer
• Is precision-bored in order to ensure permanent alignment between the column casing,
suction cover, and bearing
Impeller
The impeller is fully open, keyed to the shaft, and held in place by a self-locking capscrew in
order to ensure positive locking and prevent damage from reverse rotation. Impellers are spin-
balanced (single plane) to ISO G2.5. The impeller is provided with back vanes in order to
reduce the axial thrust and prevent the entrance of solids.
The impellers on this pump do not meet the dimensional requirements for dynamic balancing.
Strainer
The flat plate strainer is designed to maximize draw-down in a given sump depth. Openings are
sized to prevent the entrance of large solids that are commonly found in open sumps.
Discharge elbow
The discharge elbow is designed to allow the pump to fit into the smallest possible opening. A
threaded connection to the discharge pipe allows the pipe to be changed without removing the
pump from the sump.