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 TB 740-97-4
APPENDIX N
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
CRANE, FLOATING, REVOLVING,
DIESEL-ELECTRIC, 60-TON
DESIGNS 413 AND 413D
1. General. This appendix provides detailed instructions for preparation of the floating cranes, designs 413 and 413D, for dynamic
dehumidification.
2. Preparation Instructions. a. Disassembly and Stowage.
(1) Engineroom. The following items will be removed, identified, and stowed in the engineroom:
(a)
Fire pump hose.
(b)
Winch control and fire pump inspection covers.
(c)
Ship's bell.
(d)
Navigation lights.
(e)
Slewing alarm.
(f)
Horn, air operated.
(g)
Floodlights.
(h)
Boom limit switches.
(i)
Anchor davit accessories.
(j)
Windshield wipers.
(2) Anchor. The anchor will be detached from the cable and secured in the stowage fitting provided on deck.
(3) Anchor davits. The anchor davits will be removed from operating locations and secured on deck.
(4) Boom. The boom will be secured in the boom rest. The main hoist and auxiliary hoist blocks will be secured on deck.
b. Preparation for Dynamic Dehumidification.
(1) Dehumidified area.
The crane machinery house and the forward and aft winches will be prepared for dynamic
dehumidification.
(2) Provision for air circulation and moisture diffusion. To permit maximum circulation of air within the dehumidified area, all
interior doors, including cabinet doors, panel doors, switchboard doors, controller doors, and doors on similar item, will be secured in
open position. Manhole covers, handhole covers, and inspection plates on equipment located in the humidified area will be removed
and secured in other than operating position.
(3) Sealing for dehumidification. Materials and methods used in sealing for dehumidification will be in accordance with this
bulletin. Detailed sealing requirements are outlined below:
(a) Control cab. The windows and door in the control cab will be covered with metal or exterior grade plywood blanks.
The edges of the blanks and the vent on top of the control cable will be sealed with strippable coating and bituminous coating.
(b) Machinery house The windows in the machinery house will be blanked with metal or exterior grade plywood. The
door on the port side of the machinery house will be secured In an open position, and the resulting opening will be covered with a
metal or exterior grade plywood blank. The edges of the blanks will be sealed with strippable coating and bituminous coating. The
vent and exhaust stacks and hoisting cable opening on top of the machinery house will be sealed with strippable coating and
bituminous coating.
(c) Winch covers. Cover will be fabricated and installed over the forward and after winches. The covers will be
fabricated from minimum No. 18 gage galvanized sheet metal. All top and vertical edges will be reinforced by 1- x 1- x 1/8-inch-angle
iron. The cover for the forward winch will inclose the winch motor, magnetic brake, winch controller, the ballast, and bilge pump. The
fire pump will be removed from its original location and secured to the deck in the void space between the windlass and controller.
This will decrease the size of the forward winch cover by five feet. The cover for the after winch will inclose the winch motor,
magnetic brake and the winch controller. Coamings of 1- x 1-x 1/8 inch-angle iron will be tack welded to the deck to secure the
covers. The angle irons will be positioned with one face against the deck and the vertical face toward the winch. The covers will fit
snugly over the vertical faces of the coaming and will be secured to the coaming with No. 12 sheet
Change 2 N-1
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