MIL-DTL-17557F(SH)
3.4.3 Supports. Each cooler shall have a bracket installed for mounting.
3.4.4 Coil wall thickness. Wall thickness of coils shall be determined by use of the formula specified in ASME
B31.1, but shall be not less than 0.065 inch. For the composition 70-30 copper-nickel alloy specified, the allowable
fiber stress shall be not more than 9,600 pounds per square inch (lb/in2).
3.4.5 External connections. Unless otherwise specified (see 6.2), coil external connections shall be ½-inch
nominal pipe size (NPS), and shell external connections shall be ¾-inch NPS. External connections shall terminate
with 4 inches of straight length (preferred) but not less than 1 inch for attachment by socket weld.
3.4.6 Special provisions. A clearance of not less than ⅛ inch is required between adjacent turns of the coil,
between coil and shell, and between coil and baffles (where used) to permit free flow of coolant. Coil supports or
spacers, if used, shall be silver brazed to the coil at all points of contact, or where clearance is less than ⅛ inch in
order to avoid formation of crevices. Joints in the coil that may be subjected to boiler pressure shall be socket
welded.
3.4.7 Capacity. The cooling surface shall be based on a 10-percent fouling factor applied to the overall heat
transfer coefficient for clean tube surface. Unless otherwise specified (see 6.2), the cooler shall, at an operating
gauge pressure of 1,415 lb/in2, cool 0.125 gallon of water per minute from 590 to 75 °F, using chilled water as
cooling medium at 55 °F and at coolant flow rate not to exceed the upper limit as specified (see 6.2). These
parameters shall be separately prescribed if seawater is specified as coolant (see 6.2).
3.4.8 Hydrostatic pressure. The cooler shall withstand, without leakage, rupture, bulge, or flow, the following
pressures (see 4.4.1):
Shell: 225 lb/in2, unless otherwise specified (see 6.2), or if seawater cooled and for submarine application, the
shell shall meet full submergence pressure and be hydrostatically tested to 1.5 times submergence pressure.
3.5 Painting. Coolers shall be left unpainted.
3.6 Identification plates. Identification plates of sheet or cast brass or bronze shall be prepared in accordance
with MIL-DTL-15024 and MIL-P-15024/5 and shall include the following:
Name: "Sample Water Cooler" (without quotation marks).
a.
b.
Type: Sample Water Cooler.
Manufacturer s service part number.
c.
d.
National stock number (allow 20 spaces).
Manufacturer s name.
e.
f.
Contract number (contract or purchase order number applying to the cooler purchase).
g.
Date manufactured.
h.
Serial number.
Blank space for Government inspector s stamp.
i.
j.
Maximum test pressure, shell side.
k.
Maximum test pressure, coil sides.
l.
Blank space for unit number (space reserved for marking by the shipyard at time of installation).
m. The initials "U.S." (without quotation marks).
3.7 Workmanship. In order for the work to be considered acceptable, conformance to requirements of
drawings shall be mandatory.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
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