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Page Title:
Suction and discharge connection |
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|  MIL-P-21343(SHIPS)
3.3 Detail requirements. -
3.3.1
Casings.
-
3.3.1.1 The casings shall be split on the shaft centerline so as to permit ready removal of the
rotating element and replacement of bearings and glands.
3.3.1.2 Sufficient clearance shall be provided around bolt heads and nuts to permit the use of
ordinary tools.
3.3.1.3 Fitted bolts or heavy dowel pins shall be provided to insure maintenance of alignment of
casing halves in reassembly.
3.3.1.4 Forcing bolts shall be provided for breaking joints.
3.3.1.5 Pumps shall be fitted with drain connections.
3.3.1.6 Pumps shall be fitted with connections for suction and discharge pressure gauges, con-
forming to Drawing 810-1,385,860.
3.3.1.7 The pumps will be installed in conjunction with wet vacuum type priming pumps and pro-
vision shall be made for receiving priming lines at high joints in the casings.
3.3.2 Suction and discharge connection. -
3.3.2.1 Suction and discharge connections shall be flanged in accordance with Draw-
ing 810-1,385,860.
3.3.3 Impellers and shafts. -
3.3.3.1 Outside surfaces of impellers shall be smooth finished, and inside surfaces shall be file
finished insofar as practical.
3.3.3.2 Impellers shall be keyed on the shaft and securely held against lateral movement by locked
nuts or other means approved by the bureau or agency concerned.
3.3.3.3 Shaft threading shall be counter to the direction of rotation.
3.3.3.4 Shafts shall be fitted with shaft sleeves in way of stuffing boxes and diaphragms.
3.3.3.5 Shaft flingers shall be provided adjacent to stuffing boxes.
3.3.4 Stuffing boxes and packing, -
3.3.4.1 Stuffing boxes shall be of adequate depth and design to reduce leakage to a minimum under
all operating conditions.
All packing shall be of a brand
3.3.4.2 Packing shall be in accordance with Drawing B-153.
approved by the bureau or agency concerned.
3.3.4.3 All stuffing boxes shall be fitted with throat bushings.
3.3.4.4 The stuffing boxes shall be fitted with water seal connections and a bronze lantern ring
located between inner and outer rings of packing. Pumps shall be furnished complete with water seal
piping, fittings and valves as required. Special care shall be taken in the design to insure that com-
pression of the inner packing will not allow the lantern rings to move sufficiently to cut off or restrict
the sealing water supply.
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