Use a multistage centrifugal blower for the vacuum system。 Size the blower for: (1) total system pressure loss associated with the total number of hoses to
be used simultaneously, and (2) maximum exhaust flow rate entering the inlet of the
blower。
3-5。7。10 Feed the blower directly into the bag house used by the industrial exhaust system (see Figure 3-5) to minimize the number of asbestos collection points。
Figure 3-5。 Exhaust and vacuum system schematic diagram
3-5。7。11 Install a prefilter and a HEPA filter in front of the blower to prevent it from becoming contaminated。
3-5。7。12 Design the vacuum system duct to balance with the exhaust system duct where the two systems connect。
3-5。7。13 Use manufacturer guidance to design vacuum system and TM 5-805-4 as preliminary guidance。
3-5。8 Replacement Air。 Design replacement air systems with fan inlet guide vanes, variable speed motors, or "eddy current clutch" units to maintain a pressure (relative to the atmosphere) ranging from 12。4 to 24。9 Pa scale (-0。02 to -0。05 inches watergage (wg)) in the shop spaces。
a。 Maintain the pressure in decontamination areas, the equipment room, and dirty locker rooms within a range of -2。49 to -9。96 Pa (-0。01 to -0。04 inches wg)。 Maintain the pressure in clean spaces within a range of +4。98 to +12。4 Pa (+0。02 to +0。05 inches wg)。 For further replacement air system criteria, see paragraph 2-4。5。
b。 See paragraph 2-4。5 for further details。
3-5。8。1 Heating and Air Conditioning。 If necessary, provide heating and cooling according to MIL-HDBK-1003/3。
3-5。9 System Controls。 Design system controls in accordance with paragraph 2-5 and the following:
a。 Position the annunciator panel at the entrance to the dirty space so operators can monitor operating gauges。
b。 Install static pressure sensors at locations that are representative of average static pressure in each controlled space。 This will ensure that desired differential pressures are maintained。
c。 Trigger a timer if pressure varies from the specified range。 Select timer that automatically resets if the problem is corrected within
60 seconds。
d。 Trigger both visible and audible alarms if the system cannot correct the difficulty within allotted time。 Install multiple alarm beacons if operator's view is obscured during delagging。 Monitor the shop's negative pressure continuously, using strip chart recorder, so the operator can detect any pressure changes。
e。 Interlock the hand tool power supply with the ventilation system's on- off switch。 This will prevent the use of hand tools without ventilation controls。
3-6 SAFETY AND HEALH CONSIDERATIONS。 Consult the local industrial hygienists for required respiratory protection in accordance with 29 CFR 1910。1001 (f) and (g), 29 CFR 1915。1001(g) and (h)。 See paragraph 2-7。3 for additional information。
CHAPTER 4
OTTO FUEL II FACILITIES
4-1 FUNCTION。 MK-46 and MK-48 torpedo facilities maintain, prepare, and test torpedoes。 MK-46 and MK-48 torpedoes use Otto Fuel II, a toxic monopropellant。 Refer to UFC 4-216-02N, Design: Maintenance Facilities for Ammunition, Explosives, and Toxins for additional design considerations。 中央空调系统设计英文文献和参考文献(17):http://www.youerw.com/fanyi/lunwen_87300.html