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|  MIL-T-62032H
provided with not less than an 18-inch diameter manway opening. The edges of the manway
openings shall have a flange of approximately 1 inch. The cross-sectional area of each baffle
shall be not less than 80 percent of the cross-sectional area of the tank.
3.5.5 Flanging and dishing. The heads and baffles, (and for two compartment tanks, the
bulkhead) shall be uniformly flanged and uniformly dished. Flanges shall be formed by a
multi-pass roller operation or by a one step, die press operation. Heads and baffles shall be
dished by uniform hydraulic or uniform air pressure or by a one step, die press operation.
Neither the flanging or dishing operations shall involve repeated hammer blows, either manually
or automatically.
3.5.6 Sump. A sump shall be provided at the lowest point of the tank to allow the
accumulation of solid contaminants and water. The tank shall be so designed that water will
drain into the sump and will not be trapped by the baffles or stand in pockets. A sump drain
valve not less than 1 inch in size, with remote control and extended drain line, shall be provided.
The sump drain shall be protected against flying objects and shall be easily accessible for
maintenance.
3.5.7 Static air pressure. The tank, without fuel, shall withstand an internal static air
pressure of at least 5 pounds per square inch gage (psig) without evidence of leakage, in
accordance with paragraph 4-10.1 of NFPA No. 407.
3.5.8 Tank support. Full length box type, V-type, or Z-type longitudinal subframe
members shall be furnished. Full length welding pads of not less than 12 gage (0.1046 inch),
type 304 stainless steel shall extend not less than 1 inch beyond the flanges on the longitudinal
subframe members and shall be continuously welded to the tank proper. Box type longitudinal
subframe members shall be fabricated with not less than a 7 gage (0.1793 inch) mild steel outer
leg and bottom, with not less than a 12 gage (0.1046 inch) mild steel inner leg. A flange not less
than 1 inch wide shall be provided at the top of both the outer and inner legs. Flanges shall be
continuously welded to the pad over the full length of the tank. V-type longitudinal subframe
members shall be fabricated with not less than 7 gage (0.1793 inch) mild steel inner and outer
legs. A flange not less than 1 inch wide shall be provided at the top of both the inner and outer
legs. Flanges shall be continuously welded to the pad over the full length of the tank. Z-type
longitudinal subframe members shall be fabricated entirely of not less than 7 gage (0.1793 inch)
mild steel. The width of the upper Z-member shall be not less than 2 inches and shall be
continuously welded to the pad over the full length of the tank along both sides of the Z. With
the Z-type construction, additional type 304 stainless steel pads shall be continuously welded to
the tank proper at the front, rear, at each bulkhead and at each baffle. Bolsters of 3/16 inch mild
steel shall be properly integrated with the Z-type longitudinals and continuously welded to the
pads at the front, rear, at each bulkhead and at each baffle.
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