Specifications

NllL-STD- 1472E
Gumdrails should bprovided wound theo~ning atthetop ofeach fixed ladder. All fixed ladders
more than 6 m (20 ft) high shall be equipped with, or include provision for, a safety device to provide
positive protection from falls.
5.7.7.5 Ramps.
5.7.7.5.1 Cleating. Where special environmental conditions require ckating of pedestrian
ramps, the cleats should be spaced 36 cm (14 in) apart and extend from handrail to handrail at right
angles to the line of traffic.
5.7.7.5.2 Mixed traffic. When a ramp is m@red for both pedestrian and vehicle trtiIc, the
vehicle bearing surface should be located in the center of the ramp, with the pedestrian surface next to
the handrails. (A vehicle ramp with an adjacent pedestrian stairway is prefeti for this situation.)
5.7.7.6 Personnel platforms and work areas. The surfaces of exterior personnel platforms and
work areas shall be constructed of open metal grating. Exterior personnel platforms where use of open
grating is impractical and interior walkways shall be treated with nonskid material. AUopen sides of
personnel platforms shall be equipped with gudmils (with intermediate rails), with a top rail height
not less than 107cm (42 in) and a toeboard or guard screen height not less than 15cm (6 in). Hand
holds shall be furnished where needed. The distance between the platfomnedge and the centerline of
the railing should be not more than 65 mm (2.5 inches).
5.7.7.7 Elevators, inclinators, and h@raulic-operated work Platforms. Where these items im
required, the following shall be provided:
a. Maximum load signs, located where they can be easily seen
b. Guards, to prevent accidental operation of the lift
c. Limit stops, to prevent injuzy to personnel and damage to equipment
d. An automatic faiisafe brake or other self-locking device in case of lift mechanism failure
e. Provision for manually lowering the platform or elevator when feasible
f. Surface construction or treatment of open platforms, in accordance with 5.7.7.6
5.7.8 Irttzressand egress.
5.7.8.1 DOQG.Sliding doors shall never be instded as the only personnel exit from a
compartment. When a sliding door is used, a separate hinged door m the sliding door should be
provided for personnel use. Fixed e@pmeJx shall be A least 80 cm (3 in) from the swept area of
hinged doors. Where possible, a clearance of not less than 10cm (4 in) shall be provided between the
door and wall.
5,7.8,2 Hatches
5.7.8.2.1
Cdiguration. Where permitted by structural considerateions, wall hatches shall be
ihh witi k flax. Hatches N-MIopen with a single motion of the hand or foot.
5.7.8.2.2 Force mquircmcnts. When a handle is used for unlocking a hatch, the unlocking
torte retpwvd ddl h w; nu.ut thw, ?0 N (20 prvmds) Hatches placed in the overhead position shall
rrqttire no m(we[ban 220 N (50 lb) force for opening and closing and sha!l be operiibic by a surtaldy
equipped and clothed user w][h Sth
percmmk am d Iitud AU+@. The fmc C!gwiry Rhmtklhe
:Iw,3.f~!hrrr pnwihk. tm r;iw ~~i’opening. Additional requirements for hntch handwheels are given in
5.4.2.2,5 ~nrl T’:Ihlr I.k
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