a。 Position an annunciator panel at the entrance to the space with a potential for personnel exposure 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 the pressure varies from the specified range。 Select a 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 the allotted time。

4-5 SAFETY AND HEALTH CONSIDERATIONS。 29 CFR 1910 requires

specific criteria for the safety and health of operators。 The physical nature of the work and the use of protective clothing increase the potential for heat stress。 Consider cooling the replacement air to reduce this potential。  Refer to NAVSEA S6340-AA-MMA-010, Otto Fuel II Safety, Storage, and Handling Instructions for complete operational considerations。

4-5。1 Emergency Eyewash and Shower Stations。  Provide combination emergency eyewash and deluge showers in the immediate area of Otto Fuel II use。 Refer to UFC 3-420-01。

CHAPTER 5

FIBERGLASS REINFORCED PLASTIC FABRICATION AND REPAIR FACILITIES

5-1 FUNCTION。 Fiberglass reinforced plastic (FRP) shops and facilities primarily fabricate and repair aircraft and shipboard components。 Both include a shop area, a mechanical equipment area, and a decontamination area (for protective clothing)。

5-2 OPERATIONAL CONSIDERATIONS。 FRP fabrication and repair operations include sanding, buffing, fabric cutting, grinding, lay up, and wet spray up。 These operations produce dust and vapor that constitute health hazards。 The protective clothing that the workers wear and the physical nature of the work creates a potential for heat stress。

a。 Consider using airless spray equipment to reduce hazardous vapors in the shop。 Initial cost for this equipment is greater than traditional compressed air systems。 Benefits include overspray reduction and less accumulation of resin and fiberglass over the life of the equipment。 A disadvantage of these systems is their limited pattern and flow adjustment capability。

b。 Consider using low monomer polyester material, closed molding systems or low-VOC resin systems, and airless and air-assisted spray equipment to avoid the need for expensive air pollution devices。

c。 Isolate conventional grinding operations from the mixing areas and the lay up and spray up areas。 The combined hazard of dust and flammable vapors is potentially explosive。 Post signs in the lay up and spray up areas and the mixing area without low volume-high velocity (LVHV) connectors that read:

5-3 FLOOR PLAN。 Figure 5-1 shows a typical floor plan for a fabrication and repair facility。 The workers enter the clean locker rooms through the administrative area。 They put on protective outerwear and proceed to the shop area。 After performing their work, shop personnel vacuum, then discard their protective outerwear in containers near the entrances to the locker rooms。 The workers then enter the locker rooms where they remove the remainder of their work garments。

Figure 5-1。  Floor plan for FRP facility。

5-4 DESIGN CRITERIA。 Design the facility using general technical requirements in Chapter 2 of this UFC and the specific requirements in this Chapter。