MIL-PRF-38170H
gloves or mittens, bulky clothing and footgear. The design shall ensure maintenance, servicing,
and adjustments can be performed using only common hand tools. Intricate locking devices,
controls, or fasteners that can be easily overtorqued by personnel lacking feel through thick
gloves or numbness shall be avoided. The tank assembly shall have a weather-proof
compartment for storing the operation handbook and maintenance/inspection records (see 4.5.20,
4.5.20.1).
3.5.15 Pressure relief devices. The tank assembly design shall include pressure relief devices in
any line or component that can be isolated by closing valves, or where dangerous pressures can
develop. All pressure relief devices shall be installed at readily accessible locations and the
design shall ensure that a discharge of pressure will not cause danger to personnel or damage to
equipment. Incorporation of safety valves shall be in accordance with section VIII of the ASME
Boiler and Pressure Vessel Code (see 4.5.1, 4.5.3).
3.5.16 Valves.
3.5.16.1 Shutoff and control valves. Valves shall provide positive shutoff when closed, and
minimum resistance to flow when open. Each manually-operated control or shutoff valve shall
be provided with an easily-turned handle with a diameter of 3 inches per inch of nominal size,
but not less than 1 inch. If globe valves are used, those valves ½ inch and larger nominal size
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handling low-temperature liquid or gas shall incorporate seats than can be renewed without
removal of the valve from the tank piping. Sealing discs or plugs for these valves shall also be
renewable without replacing the valve stems. All valves handling low-temperature liquid and
gas shall have their packing glands located not less than the distance specified in table I from the
valve center connection centerline (see 4.5.1).
TABLE I. Separation of Valve Packing Gland from Valve
Connection Centerline.
Valve Nominal Size (inches)
Separation of Packing Gland from
Connection Centerline (inches)
1/4
4
3/8
4
1/2
7
3/4
7
1
9
1-1/4
9
1-1/2
11
2
11
2-1/2
12
3
12
10
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