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|  MIL-P-17639F(SH)
3.3.1 .1.3 Casing wearing rings shall be fitted in all pumps. For submarine
sea water pumps, casing wearing rings shall be located and shaped in such a
manner that leakage through wearing ring clearances shall not be allowed to
impinge directly on the casing.
3.3.1.1.4 Casing wearing rings shall be secured by means of both axially
oriented setscrews, which are equally spaced, and interference fit.
3.3. 1.1.5 Pump casing joints shall be made up using compressed asbestos
sheet gaskets. 0-rings may be used to seal casing joints in sea water pumps
for submarines and other applications when approved by the design review agency.
3.3.1.2 Class C-2 pumps.
3.3.1.2.1 Pumps shall be capable of parallel operation and shall have
constantly rising head capacity characteristic curves. Each pump with a total
head gauge pressure of 100
or more shall have a characteristic curve such
that at constant rated speed the total head at shut-off will be not less than
10 percent nor more than 20 percent above total head at rated capacity.
3.3. 1.2.2 The preferred design shall be of the single stage suction volute
type. Two stages may be used if necessary to provide an acceptable hydraulic
design.
3.3. 1.2.3 Casing wearing rings shall be fitted in all pumps. For pumps
with axially split casings, casing wearing rings shall be fitted to the lower-
half casing by a double tongue and groove and in the upper-half casing by a
single tongue and groove. A single tongue and groove may be used in the upper
and lower-half casing provided the radius of the tongue and groove in the lower-
half casing is greater than in the upper-half casing to prevent rotation of the
casing wearing ring. For submarine sea water pumps, casing wearing rings shall
be located and shaped in such a manner that leakage through wearing ring clear-
ances shall not be allowed to impinge directly on the casing.
3.3.1.2.4 Each class C-2 pump with a total head gauge pressure of 100
or higher shall have a synthetic rubber seal between the casing wearing ring and
casing. The seal may be an Oring or flat face type.
3.3.1 .2.5 Pump casing joints shall be made up using compressed asbestos
sheet gaskets. O-rings may be used to seal casing joints in sea water pumps for
submarines and other applications when approved by the design review agency.
3.3.2 Performance characteristics.
3.3.2.1 The performance characteristics of the pump shall be as specified
(see 6.2.1).
3.3.2.2 Pump suction conditions shall be as specified (see 6.2.1).
303.3 casings.
3.3.3.1 Casings of class C-2 flexible-coupled pumps shall be divided into
two parts to permit ready removal of the rotors and replacement of bearings and
glands.
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