MIL-P-18140(SHIPS)
3.3.10 Drains. - The bottom of all pump cacings or head shall be provided with a drain connection.
Drains shall be fitted to drip pockets,
3.3.11 Casings and heads. -
3.3.11.1 Casings shall be made as light as possible consistent with strength and shall be ribbed
and braced on the outside as necessary to give stiffness and rigidity under the working pressure. The
interiors shall be smooth cored with easy bends wherever the direction of flow is changed,
3.3.11.2 It is preferred that pump casings be equipped with easily removable liners, However,
consideration will be given to pumps not having this feature. Either liners or cylinders shall be supplied
as repair parts as specified in 3.9 covering wearing parts.
3. 3.11. 3 Suction and discharge openings snail be cast integral with the casings or heads, shall
have machined and scraped or ground flange faces suitable for metal to metal joints, and shall be located
as approved by the bureau or agency concerned,
3.3.11.4 The heads shall have accurately machined faces with a ground or scraped finish. Joints
between casings and heads may be made up either metal to metal or with a thin manila paper gasket not
exceeding 0.007 inch in thickness, Heads shall be rabbetted or doweled to the casings.
3.3.11.5 Forcing bolts and lifting bolts shall be provided as necessary for convenient handling
during overhaul.
3. 3.11.6 One or more test lugs may be required to be cast integral with gun metal castings in
accordance with Specification MIL-M- 16576, at the discretion of the bureau or agency concerned. When
test lugs are required the bureau or agency concerned will advise in its comments on working drawings
as to the number, size and location of the test lugs required.
3.3.12 Rotors and shafts. -
3.3.12.1 All rotors shall be accurately finish machined or ground throughout.. They shall be
secured to the shafts by keys or other method approved by the bureau or agency concerned, Rotors
shall be secured positively against lateral displacement on shafts.
3.3.12.2 Means shall be provided for the escape of the liquid pumped from all points between rotors
or gear teeth where it may be trapped during operation and thereby create a dangerously high pressure.
Means of entrapment relief shall be satisfactory to the bureau or agency concerned.
3.3.12.3 Deflector rings or other similar method approved by the bureau or agency concerned
shall be used to prevent leakage from the stuffing boxes running along the shafts. The use of felt seal
rings only will not be approved; if authorized in combination with other methods, they shall be installed
so they can be replaced without dismantling the pump,
3.3.12.4 All shafts shall be accurately machined and ground. Means shall be provided on the
driven or driving shaft of each unit so that a portable tachometer may be quickly and easily applied or
unless a revolution counter is permanently installed. Either the tachometer or revolutions counter
shall by of a type which is satisfactory to the bureau or agency concerned, Provision for the use of
tachometer will not be required on pumps driven by alternating current motors. Shafts shall have a
minimum hardness of 275 Brinell.
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