3.4.2 Welding shall be in accordance with MIL-STD-278.
3.4.3 Threaded parts such as bolts, studs, and nuts shall conform to Handbook H-28.
The use of tap bolts or cap screws is prohibited unless specifically approved by the design
review agency, where the use of through bolts or studs is impracticable. The setting end
of studs shall be class 5 fit or class 3 fit with locking resin in accordance with MIL-S-22473.
The nut end shall be class 3 fit.
3.4.4 All gaskets shall be in accordance with Drawing B-153. Gasket compression and
tolerances shall not effect baaring, bushing, or wearing ring fits to an extent that will
adversely affect reliability and performance. Internal gasketing of type III and IV pumps
shall be completely encased. Spiral wound gaskets shall be used only where use of a sheet
gasket or O-ring is impracticable. Internal spiral wound gaskets shall be completely encased
to prevent the gasket from unwinding and entering the fluid system.
3.4.5 Root connations for attaching pipes shall be in accordance with Drawing B-214.
3.4.6 Pipe connections shall be of the flanged, union, or welded type as applicable.
Should this not be feasible, a straight thread fitting of a type approved by the design
review agency, may be used.
3.4.7 Pressure gages shall be provided with the unit, unless otherwise specified
(see 6.1), and mounted in accordance with Drawing 810-1385850. Gages shall be positioned
for accessibility for reading and maintenance. Gages shall be secured to parent equipment
in such a manner as to prevent vibration, breakage and disconnection.
All internal threaded fasteners and threaded machine
locking devices where continuous operation under the condition
of shock, vibration, and temperature specified herein depend on maintaining tight connec-
tions of parts. Sat screws shall have locking devices. Locking devices shall be subject
to approval by the design review agency.
3.5 Identification plates. Identification plates shall be furnished on each pump
and shall be type A or B in accordance with MIL-P-15024 and MIL-P-15024/5, except that
identification plates of plastic or aluminum are not acceptable.
3.5.1 Identification plates shall be secured to equipment with corrosion-resistant
metallic screws or rivets.
3.5.2 Pump identification plates shall contain data as follows:
Manufacturer's model or type and size.
Manufacturer's pump serial number.
Salient design characteristics.
(1) Capacity in gallons per minute (g.p.m.).
(2) Total head in p.s.i.
(3) Speed of shaft in revolutions per minute (r.p.m.)
(4) Brake horsepower.
(5) Test pressure.
(6) Special data vital to the unit:
a. Suction pressure.
c. Impeller diameter(s).
d. Contract number (and item number for multiple unit orders).
e. Federal stock number.
f. NAVSHIPS technical manual number.
g. Section for Defense Contract Administration Service (DCAS) stamp.
3.6.1 For pumps operating at a temperature of
or less, all external unmachined
Surfaces of ferrous metal parts except corrosion-resisting steel shall be thoroughly
eleaned and coated with paint in accordance with the following specifications:
(a) One coat of pretreatment primer in accordance with MIL-P-15328.
(b) One coat of zinc chromate primer in accordance with TT-P-645, or one
coat of red lead primer in accordance with MIL-P-17545.
(c) One finish coat of light gray equipment enamel in accordance with MIL-E-
15090 except where thermal insulation is installed.