MIL-DTL-18492B (OS)
and manufacture of the other production gages as may be required for the satisfactory fulfillment of
contract requirements.
3.7 Top ring. The top ring shall be assembled on the tank with its axis coincident with that of the tank
body. The pressure or helical bearing surfaces of the top ring and the top of the cover ring, which will
serve to secure the cover assembly to the tank, shall be a smooth true helix, with the axis coinciding with
the axis of the tank. There shall be no tendency for the outside cylindrical surface of the cover ring to jam
or bind with the opposing inside cylindrical surface of the top ring. All coincident axes shall be within
tolerances specified on the applicable drawings.
3.8 Locking rings. For tanks fitted with tongue and groove locking rings, the tongue and grooves of the
adjacent tanks shall so fit with each other that bearing between neighboring locking rings shall be on top
of the tongues or ridges and on the bottom in grooves. There shall be no tendency for tongues to wedge
in grooves, nor shall bearing between the tanks take place on the outer cylindrical surfaces of the top ring
between the top edge and the locking ring.
3.9 Cover Assembly.
3.9.1 Cover. The cover shall be manufactured in accordance with the applicable drawing. The cover
shall be free to rotate with respect to the cover ring after the cover has been formed into the groove in the
cover ring. Prior to assembly, apply a thin continuous coating of grease, MIL-PRF-81322, between all
sliding surfaces of the cover.
3.9.2 Cover ring. The axis of the cover ring shall be perpendicular to the surface of the cover which
forms a seat for the gasket and shall be coincident with the axis of the helical bearing surface within
tolerances specified on the applicable drawings. The cover ring and cover assembly, when in the
unlocked position, shall be easily removed from the top ring at any of the positions in which it may be
assembled to any tank.
3.9.3 Gasket and gasket bearing surface. A new gasket of the type prescribed by the applicable drawings
shall be cemented in the tank cover with an adhesive of the type prescribed by the applicable drawings.
The gasket mating surface shall have a 125/micro inch minimum finish and shall be flat within +/-.005
inches. Bearing surfaces shall not injure the gasket during closing and opening of the tank, and shall
ensure proper seating of the gasket. The gasket shall provide sealing at closure of the cover assembly (see
3.13).
3.10 Bottom. The axis of the outside cylindrical surface of the bottom shall coincide with the axis of the
tank body and the top ring within the tolerance specified on the applicable drawings. The bottom surface
shall be perpendicular to the tank axis and parallel to the top surface of the top ring within tolerances
specified on the applicable drawings.
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