MIL-T-62032 Trucks, Tank: Fuel Servicing And Aircraft Fuel Servicing, 1,000 To 4,000 Gallon, Diesel And Gasoline Engine Driven, 16,000 To 50,000 Pounds Gvw, 4X2, 4X4, 6X4, And 6X6, Modified CommercialThis specification covers diesel and gasoline engine driven, four-wheel, two- or four-wheel drive, and six-wheel, four- or six-wheel drive, single or dual delivery fuel servicing and aircraft fuel servicing tank trucks, with product capacities from 1,000 to 4,000 gallons, having minimum gross vehicle weights GVW of 16,000 to 50,000 pounds for normal operating conditions. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62032H

* 3.5.9 Manholes. Each compartment of the tank shall be equipped with a round manhole opening not less than 19 inches in diameter. A lightweight, liquid-tight, easy opening manhole cover or a bolted cover with a liquid-tight easy opening fill cover not less than 10 inches in diameter shall be supplied. The manhole shall be fully compatible with the use of a

Parker-Hannifin Model F428A vapor-recovery adapter cover (to be in place only when

top-loading). All materials used shall be resistant to corrosion and to deterioration from contact

with the product fuel. Normal breathing venting may be incorporated into the manhole cover (see 3.5.11). If the cover is hinged, the hinge shall be forward-mounted and the cover shall have self-latching catches. The manhole cover shall have provisions for a padlock. When specified (see 6.2), a 2-inch National Pipe Thread (NPT) coupling and plug shall be provided in the tank, near the manhole cover, to permit future installation of a second fuel level-sensing device.

3.5.10 Capacity marker. A capacity marker or indicator disk of corrosion-resistant construction shall be installed at the side of each manhole. The marker shall be located so as not to interfere with the vapor recovery adapter cover specified in 3.5.9. The marker shall be set to indicate rated tank capacity 1 percent.

3.5.11 Vents. Each tank compartment shall be vented to comply with the requirements of 49 CFR, Section 178.341, Specification MC-306, and the additional requirements specified herein.

3.5.11.1 Normal venting pressure limits. The lower opening limits for normal venting (inbreathing, outbreathing) shall comply with the opening limits required by the California Air Resources Board for vapor recovery, as summarized herein:

(a) The entire tank and venting system shall be sufficiently vaportight, such that a pressure change of not more than 1 inch of water shall occur within 5 minutes when the tank is pressurized to 18 inches of water (gage) or evacuated to 6 inches of water (gage);

(b) The outbreathing pressure vents shall remain closed as tank compartment pressure is

increased above 18 inches of water (gage), but shall open before compartment pressure reaches 27.7 inches of water (1 psig);

(c) The inbreathing vacuum vents shall remain closed until tank compartment vacuum drops below 6 inches of water (gage), but shall open before a vacuum of 10.4 inches of water (gage) is reached (6 ounces per square inch gage).

3.5.11.2 Normal venting capacity. The normal vents shall have sufficient vapor flow capacity to permit bottom loading at a rate of 600 gpm, and for types I through IV to permit loading and unloading through the plumbing system at not less than 200 gpm, all with the manhole and fill covers closed, without damage and without exceeding the vacuum and pressure limitations of 49 CFR, section 178.341, specification MC-306 (maximum pressure of 3 psig; maximum vacuum of 1 psig).