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 TB 740-97-4
APPENDIX M
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
CRANE, FLOATING, REVOLVING, DIESEL,
ELECTRIC 100-TON, DESIGN 264B
1.
General. This appendix provides detailed instructions for preparation of the floating crane, design 264B, 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) Fire pump and control box.
(2) Galley. The following items will be removed, identified, and stowed In the galley:
(a) Mushroom vent for the galley.
(c) All canvas covers.
(3) Machinery house. The following items will be removed, identified, and stowed in the machinery house:
(a) Boom limit switches.
(b) Boom lights.
(c) Floodlights.
(d) Navigation lights.
(e) Ship's bell.
(f) Horn.
(g) Turning alarm.
(h) Windshield wipers.
(i) Machinery house door.
(4) Anchor chains. The anchor chains will be detached from the anchors and stowed in the chain locker.
(5) Anchor. The anchors will be mounted on chocks and secured on the forward deck.
(6) Boom. The boom will be secured in the A-frame.
b. Preparation for Dynamic Dehumidification.
(1) Dehumidified area. The galley, berthing space, engineroom, crane cab, windlass, and capstan
machinery spaces will be prepared for dynamic dehumidification.
(2) Provision for air circulation and moisture diffusion. To permit maximum circulation of air within the
dehumidified zones, all interior doors, including cabinet doors, panel doors, refrigerator doors, controller doors, and doors
on similar items, will be secured In an open position. Manhole covers, handhole covers, and Inspection plates on
equipment located in dehumidified areas will be removed and secured In other than operating position. The hatch covers
in the galley and berthing space that lead to the storage area below will be secured in partially open position. The capstan
motors, the motor reducers, and the controller panels, located in the void spaces below the capstans, will be opened to the
circulation of dehumidified air by the removal of inspection plates and the opening of the panel doors. Connections to and
from the crane fuel oil tank will be broken and left open. All doors and inspection plates on the heater will be secured in a
open position to permit circulation of air.
(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) Capstans and capstan controllers. The openings between the capstan heads and the capstan pedestals
and the Joint at the pedestals and the deck will be sealed with strippable coating and bituminous coating. Pressure-
sensitive tape will be utilized, If necessary, to bridge openings, prior to the application of the strippable coating and the
bituminous coating. The opening on the capstan control boxes and the openings at the joint where the control cables pass
through the deck will be sealed with strippable coating and bituminous coating. The underside of the towing lug pins, the
slotted openings at the bulkhead, in way of the transverse deck framing, and the floor drain openings In the forward
compartment will be sealed with strippable coating.
(b) Windlass cover. A cover will be fabricated and installed over the anchor windlass and the windlass
controller. The cover will be fabricated from minimum No. 18 gage galvanized sheet metal. All top and vertical edges will
be reinforced by 1-x 1-xl/8-inch-angle irons. Acoaming of 1-x 1-x 1/8-inch-angle iron will be tack
Change 2 M-1
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