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|  MIL-P-19131(SHIPS)
3.3.15 Couplings. -
3.3.15.1 Unless otherwise specifically approved by the bureau or agency
concerned a flexible coupling of all metal construction and of a design satisfactory
to the bureau or agency concern shall be installed between the pump and the driving
unit.
3.3.15.2 AU coupling hubs, which are to be fitted to driving or driven shafts
larger than 1 inch in diameter, shall be fitted to the shafts on a taper, shall be
occured against turning on the shafts by keys fitted parallel to the taper, and shall
be secured on the shafts by lock nuts.
3.3.18 Stuffing boxes and packing. -
3.3.16.1 Stuffing boxes shall be of adequate depth and so designed that when
properly packed leakage is reduced to a minimum under all operating conditions.
3.3.16.2 Pump gland packin g shall conform to the applicable specifications
listed on Drawing B-153. Sufficient space shall be provided between the bearings
and stuff ing `boxes to permit ready renewal of packing and inspection and overhaul
of the bearings.
3.3.18.3 Where a stuffing box is subject to discharge pressure, the design of
the box shall be such as to trap the leakage therefrom by the use of a seal ring, or
other method approved by the bureau or agency concerned, and return same `by drain
piping to the suction side of the pump, with needle valve to control the flow where
necessary. Where a stuffing box is subject to suction pressure, suitable means
shall be provided by seal rings and seal piping connected to the discharge of the
pump for sealing the packing to prevent leakage of air into the pump suction. The
sealing piping shall be fitted with a needle valve or valves as necessary for proper
control.
3.3.16.4 Glands and seal rings, if used, shall be split in halves with the halves
secured together in a manner to form solid rings for setting up.
3.3.16.5 All stuffing `box glands shall be set up by nuts threaded on gland swing
bolts or studs secured in the casings.
3.3.16.6 Seal rings shall be constructed, insofar as practical, so that lantern
gland extracting tools in accordance with Specification GGG-P-15 may be used.
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