MIL-DTL-2036E
in respect to the vertical axis. Enclosures designed for optional mounting in more than one orientation
may need to be equipped with more than one drain hole; however, the lowermost hole shall effectively
drain the entire enclosure in whatever optional orientation the enclosure is mounted. The lowermost drain
plug shall be directly accessible with adequate space for wrenching when the equipment is installed in its
operating environment aboard ship; that is, access space shall be provided that will enable a man using
only his hands and an 8-inch adjustable end wrench to remove and replace the effective drain plug in
whatever optional orientation the equipment is installed.
3.2.15 Prevention of leakage along shafts of spraytight and watertight rotating equipment. Except where
integral face-mounted equipment forms a part of the complete assembled equipment enclosure and
eliminates shaft exposure, a means shall be provided, as applicable (see 3.2.15.1 or 3.2.15.2), to prevent
water leakage along the shaft where it penetrates the enclosure.
3.2.15.1 Spraytight. Either of the following leakage preventative methods shall be used to minimize shaft
leakage of rotating equipment:
(a)
A combination of shaft slinger and close clearances between the shaft and housing. The slinger
shall be located immediately outside the housing. The external diameter of the slinger shall be
not less than 1.5 times the shaft diameter and the axial clearance between the end shield and
slinger shall not exceed 0.030 inch (.0762mm). The slinger shall be attached to the shaft using a
set screw or screws. A filler compound may be used to prevent leakage of water through the fit
between the slinger and shaft. The close clearance between the housing and shaft shall be in
accordance with table II. To break up the capillary path of leakage flow through the clearance
between the shaft and the housing at least one peripheral (radial in depth) groove shall be cut in
the housing. The slinger shall be provided with a guard, except that if the slinger end shield or
the coupled equipment design is such as to preclude personal injury, the guard may be omitted.
If the slinger is exposed, omission of the guard shall require the approval of the contracting
activity. Slinger guards, where used, shall permit the expulsion of water.
TABLE II. Shaft clearance for spraytight machines.
Shaft diameter
Radial clearance
Axial length
inches
maximum
of clearance
Less than 1
.375 inch
7 mils per inch
(2.54mm)
(9.525mm)
of shaft diameter
(.178mm)
1 to 4
(2.54 to 101.6mm)
.5 inch
(12.7mm)
Over 4
As approved by
(101.6mm)
contracting activity
(b)
A rubbing seal between the shaft and housing. If a rubbing seal is used, the closure shall be
watertight.
3.2.15.2 Watertight. A rubbing seal between the shaft and housing shall be used except where integral
face mounted equipment forms a complete watertight assembly.
3.2.15.3 Totally enclosed. When specified in the contract or order, or the individual equipment
specification (see 6.4), the enclosure shall be such that it can be converted to watertight (see 3.2.15.2) by
the addition of gaskets.
3.2.16 Totally enclosed, water-air-cooled motors and generators. Totally enclosed, water-air-cooled
motors and generators shall be provided with an air cooler of double tube construction to insure against
water leakage into the windings of the machine.
3.2.16.1 Air coolers. Unless otherwise specified (see 6.2.1), air coolers shall conform to class 1, 2, or 3
of MIL-C-19836 as required by the individual equipment specification or as specified (see 6.4).
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