MIL-HDBK-1028/3
faced with stainless steel mesh with openings no larger than one-half inch to
prevent light material such as wiping cloths from entering the exhaust hoods.
The hood designs should feature a spill-retaining-lip.
Air Velocity Requirements. The crossflow supply air velocity
5.5.5
should be 2.5 fps (0.7 m/s) minimum. The exhaust air transport velocity of
the exhaust duct shall be designed for 33.33 fps (10 m/s). The capture
velocity of the Otto fuel fumes at 24 in. (609 mm) from the face of the
working edge shall not be less than 2.5 fps (0.7 m/s). All hood slots shall
provide at least 33.3 fpm (10 m/s) air velocity through the slot.
System Controls. Supply and exhaust fans must be interlocked to
5.5.6
function simultaneously. The duct system must have adequate dampers to
assure proper balancing. Static pressure monitoring devices shall be
provided to warn occupants when there is a loss of negative pressure and when
filter change is needed.
5.5.7
Other Desire Considerations. Afterbody Breakdown and
Fueling/Defueling Rooms require a properly sized sump for Otto fuel II
containment. Room floors must gently slope toward the sump. Special
attention should be devoted to containment of an Otto fuel II spill or
washdown liquids. Fume-resistant washable walls and floors shall be
provided. The sump shall have a grate. The subject rooms should have drop
T-bar type ceilings with integral lighting are acceptable. The
ceilings.
lighting level should be 100 footcandles (fc) at working level.
Desire Review Requirements. In addition to Section 1
5.5,8
requirements, Commander, NAVFACENGCOM, requires that bases for design and 35
percent complete project drawings for facilities involving MK-46 or MK-48 IMA
operations shall be forwarded to NAVSEAWARENGSTA (22G), Keyport, Washington,
for review.
Electrical Requirements. Electrical service, lighting, and
5.6
communications shall be provided in accordance with NFPA 70, NAVFAC DM-4
Series, and as defined in paras. 5.6.1 through 5.6.6.
5.6.1
Power. The capacity of the shop, as shown on Facility Plates in
Appendix A, should be verified for each design due to constantly changing
electrical requirements.
a) Single-phase, e.g. 120 Vat, 20 A, 60 Hz convenience outlets
shall be provided in all spaces with spacing as required by NFPA 70 and user
requirements.
b) Three-phase, 120/208 Vat, 60 Hz; three-phase, 115/200 Vat, 400
Hz; and 28 Vdc power shall be provided in Shop No. 1, Shop No. 2, and the
instrument testing room (refer to MIL-STD-704, Aircraft Electric Power
characteristics, for 400 Hz and 28 Vdc power requirements).. Three-phase,
220-v, 60-Hz power shall be provided where the Mark 540 Test Set is used in
testing the Mark 46 Torpedo.
c) The ampacity of 3-phase and direct-current outlets shall be as
required by the using agency for the specific facility.
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