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Suction and discharge connections |
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|  MIL-V-18683A(SHIPS)
3.4.1.2 Sufficient clearance shall be provided around bolt heads and nuts to permit the use of ordinary
tools,
3.4.1.3 Fitted bolts or dowel pins shall be provided to insure maintenance of alignment of easing parts
`in re-assembly.
3.4.1,4 Casings shall be provided with drain connections.
3.4.2 Suction and discharge connections.
3.4.2.1 Suction and discharge connections shall be flanged for mating with flanges in accordance with MIL-
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STD-438 or MIL-STD-777 as applicable, and as specified (see 6.1), except tapered pipe threads are acceptable
for use in grease fittings,
3.4.2.2 The thichness of the flanges shall be not less than that specified in the applicable specification
or drawing.
3.4.3 Rotors and shafts.
3.4.3.1 Rotor surfaces shall be smooth finished,
3.4.3.2 Rotors shall be keyed on the shaft and securely held against lateral movement by looked nuts or
other means approved by the command or agency concerned.
3.4.3.3 Shaft threading shall be counter to the direction of rotation except where both right hand and
left hand units of the same design are involved, in which case, in order to reduce the number of shafts
required for repair parts, the threading shall be right hand for all unite and the threaded parts shall be
looked in place.
3.4,3.4 Shafts shall be fitted with shaft sleeves in way of stuffing boxes unless otherwise approved by
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the command or agency concerned,
3.4.3.5 The shafts of all pumps, except those driven by a.c. motors, shall be provided with means to per-
mit the ready and direct use of portable tachometers.
3.4.4 Stuffing boxes and packing.
3.4.4.1 Stuffing boxes shall be of adequate depth and design to reduce leakage to a minimum under all
operating conditions. Mechanical seals are acceptable.
All packing shall be of a brand approved by
3.4.4.2 Packing shall be in accordance with Drawing B-153.
the command or agency concerned.
3.4.4.3 The design shall be such as to insure that leakage from the glands cannot reach the bearings or
be thrown over bearing housings or driving units. This shall preferably be accomplished by using glands cored
out internally and the shafts provided with flingers. Ample drip pockets, spray shields and drains shall be
provided.
3.4.4.4 Glands shall be split in halves with the halves secured together in a reamer to form solid rings
for setting up.
3.4.4.5 All stuffing box glands shall be set up by units threaded on gland swing bolts, or on studs
secured in the casings.
3.4.4.6 Mechanical seals when used shall be positioned on the shaft by means of stub or step sleeves,
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Mechanical seals shall not be positioned by use of set screws. The design shall insure that positive liquid
pressure is supplied to the seal faces under all conditions of operation and that there is adequate circulation
of the liquid to the seal faces to minimize the deposit of foreign matter on the seal parts,
3.4.5 Couplings.
3.4.5.1 Flexible couplings, when required, shall be of all metal construction.
3.4.5.2 All flexible coupling hubs shall be keyed to the shafts and secured by locknuts. For shafts 1
#
inch in diameter and larger, the hubs shall be fitted on a taper. Horizontally flexibly coupled units with
bedplates shall have coupling guards provided. Guards shall be designed to permit ready access to the coupling
for lubrication and Inspection.
3.4.6 Priming valve.
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