MIL-P-18140(SHIPS)
3.3.13 Timing gears,- Timing gears may be of the spur or single helical type. Timing gears of
steel shall be case hardened to a minimum depth of 0. 0625 inch and shall have a hardness of 575 to
700 Brinell. Gears shall be fully enclosed and adequately lubricated. Timing gears shall be secured
to the shafts by keys or other method approved by the bureau or agency concerned. .
3.3.14 Couplings. -
3. 3.14.1 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 concerned shall be
installed between the pump and the driving unit,
3.3.14.2 All coupling hubs, which are to be f itted to driving or driven shafts larger than 1 inch in
diameter, shall be fitted to the shafts on a taper, shall be secured against turning on the shafts by keys
fitted parallel to the taper, and shall be secured on the shafts by loc k nuts.
3.3.15 Stuffing boxes and packing. -
3.3.15.1 Stuffing boxes shall be of adequate depth and so designed that when properly packed
leakage is reduced to a minimum under all operating conditions.
3.3.15.2 Pump gland packing shall conform to the applicable specifications listed on Draw-
ing B- 153. Sufficient space shall be provided between the bearings and stuffing boxes to permit ready
renewal of packing and inspection and overhaul of the bearings.
3.3.15.3 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 sealring, 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,
3.3.15.4 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.
3.3.5.5 All stuffing box glands shall be set up by nuts threaded on gland swing bolts or studs
secured in the casings.
3.3.15.6 Seal rings shall be constructed, insofar as practical, so that lantern gland extracting
tools in accordance with Specification GGG-P-15 may be used.
3.3.16 Rubbing speeds, - The maximum rubbing speed in feet per minute for a particular type
pump shall be the speed established for the type pump during the qualification test, Pumps shall not be
offered which operate at a rubbing speed greater than the rubbing speed at which the pump of the same
type operated on qualification test.
3.3.17 Threaded parts. - Threaded parts shall conform to Handbook H28,
3.3.18 Welding. - Welding shall be in accordance with Section S1-4 of the General Specifications
for Machinery.
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