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 TB 740-97-4
APPENDIX P
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
REPAIR SHOP, FLOATING, MARINE REPAIR,
NONPROPELLED, STEEL, 210-FOOT, DESIGN 7011
1. General. This appendix provides detailed instructions for preparation of the floating repair shop, design 7011, for dynamic
dehumidification.
2. Preparation Instructions. a. Disassembly and Stowage.
(1) Main deckhouse. The following items will be removed, Identified, and stowed within the main deckhouse:
(a)
Motors (weather exposed).
(b)
Floodlights.
(c)
Searchlights.
(d)
Navigation lights.
(e)
Amplifiers (weather exposed only).
(f)
Air whistle and bell.
(g)
Lifeboat falls and gear.
(h)
Lifeboats and gear.
(i)
Anchor falls.
(j)
Canvas covers.
(k)
Halyards and staffs.
(I)
Chain railing and stanchions.
(m
Dog wrenches and keys.
(n)
Handles for davits, windlass brakes, and monorail topping winch.
(2) Crane cab. The crane windshield wiper blades will be secured to the viper motor within the cab.
(3) Exhaust systems. The flexible section will be removed from each exhaust system and secured adjacent to its place of use.
(4) Boiler. Inspection door to firesides and inspection covers to watersides will be secured in open position. The first section of
the boiler stack above the boiler will be removed and secured, against movement, within the boiler compartment.
(5) Distiller . To permit circulation of air within the distiller, inspection plates will be secured in open position.
b.
Preparation for Dynamic Dehumidification.
(1) Dehumidified area. The entire vessel, except the forepeak, the forward chain locker, and the midships deckhouse, will be
prepared for dynamic dehumidification.
(2) Provision for air circulation and mois ture diffusion. Within the areas being dehumidified, all interior doors will be secured in
open position. All dampers in the ventilation systems will be turned to open position. The bolted plate in the bulkhead forward of the
heating boiler will be removed and secured. The hatch boards will be installed over the hatch openings in the main deck to induce
longitudinal circulation of air through the vessel. Doors and hinged covers on refrigerators, galley range, ovens, boiler, and electrical
panels and boxes will be secured in open position. Manhole and handhole covers, opening into tanks and the aft chain locker, will be
removed and secured.
(3) Blowers for main dehumidification system . Two fans will be installed in the hold. One will be attached in the opening created
by removal of the bolted plate from the boiler room bulkhead. The other will be placed in the doorway located in the starboard side of
the watertight bulkhead at the forward end of the No. 1 hold. Both fans will be positioned to create flow of air toward the midship
hold. The fans will be wired into the main dehumidification system so that they operate and shut off simultaneously with the
dehumidification machine. The fans will be nominal 16-inch size, propeller-type, non-oscillating, operable on 115 volts, 60-cycle
current, with explosion-proof motor, conforming to MIL-Spec F-16081. The fans will be attached to suitable brackets or plywood
frames for mounting in specified locations. Guards will be installed for protection of personnel.
(4) Sealing for dehumidification . Methods and materials used in sealing for dehumidification will be in accordance with this
bulletin. Detailed sealing requirements are outlined below.
(a)
Aft chain pipe opening. The aft chain pipe opening will be covered with a blank fabricated from -inch exterior
grade plywood or No. 26 gage galvanized sheet metal. The blank will be firmly secured over the opening and will be provided with a
hole of sufficient size to permit the passage of the sensing element and the installation of the sensing
Change 2
P-1
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