MIL-HDBK-1027/1B
3.4.3
Wire Mesh Doors. Wire mesh doors should be
constructed of 38 mm angle steel with 9.5 mm by 12.7 mm steel
wire mesh fastened to it.
3.4.4
Automatic Closing (Ellison) Doors. Automatic closing
(Ellison) doors should be in accordance with NAVSHIPS Dwg.
803-5184129. Refer to Appendix A, Figure A-8. Ellison doors
are nonwatertight, steel, balanced doors which close
automatically by the action of an internal spring. Ellison
doors should be shielded from the radiant heat of the
fireplaces. The door should be 900 mm wide. These doors are
considered to be proprietary and are provided by Ellison Bronze
Co., Inc.
3.4.5
Large Hatch. A large hatch should be provided in
accordance with BUSHIPS Dwg. 805-1624089. This hatch should be
900 mm by 1550 mm with six wrench-operated dogs, spring-balanced
and should include a 635 mm, quick-acting, spring-balanced,
raised scuttle.
3.4.6
Small Hatch. A small hatch should be provided in
accordance with BUSHIPS Dwg. 803-1645097. This hatch is 900 mm
by 1070 mm raised, oval, quick-acting, and spring-balanced. It
should include 330 mm diameter handwheels on both sides which
operate four dogs. Provide safety chains or rails around the
top of hatches.
3.5
Ladders
3.5.1
Inclined Ladders. Inclined ladders should be designed
in accordance with NAVSHIPS Dwg. 805-1749113. The weight of the
ladder should be supported from floor beams instead of deck
grating. The slope of the ladder should not exceed 60 degrees
from the horizontal and unless indicated otherwise, should have
landings at either end with a minimum of 1070 mm clear space.
When the ladder rises more than 6100 mm of vertical height, an
intermediate landing should be provided in accordance with OSHA.
a) The top tread of an inclined ladder should be
225 mm wide and start 51 mm away from the deck cowling. Other
treads should be 150 mm wide. Non-slip treads, within wet
conditions, should be used exclusively. Head room clearance
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