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 TB 740-97-4
The drain plugs and inspection plates will be removed from the exhaust manifold and secured adjacent to places of removal.
(3) Sealing for dehumidification . Methods and materials used in sealing for dehumidification will be in accordance with this
bulletin. Detailed sealing requirements are as follows:
(a) Crew quarters scuttle. The scuttle to the crew quarters will be sealed by troweling bituminous coating into the aperture
between the coaming and closed cover. The recess in the cover will be masked with pressure-sensitive tape and sealed with
strippable coating and bituminous coating.
(b) Tanks, vents, fills and discharges. All tank vents and fills and discharge openings located in deck will be sealed with
strippable coating and bituminous coating.
(c) Fire monitors. The openings resulting from the removal of the fire monitors and valves will be blanked and sealed with
strippable coating and bituminous coating.
(d) Stack. The louvered section and the openings at the top of the stack will be masked with pressure-sensitive tape and
sealed with strippable coating and bituminous coating. The joint between the stack cover and the rim will be sealed with strippable
coating. The exhaust stacks protruding from stack cover will be blanked and sealed with strippable coating and bituminous coating.
The door in the stack will be sealed with strippable coating and bituminous coating. All other seams or openings in the stack which
affect the air tightness will be sealed in a similar manner.
(e) Gooseneck and mushroom vents. Gooseneck and mushroom vents will be sealed with strippable coating and
bituminous coating.
(f) Voice tubes. The mouthpiece covers on the voice tubes located in the emergency steering station will be sealed with
strippable coating and bituminous coating.
(g) Fidley. The stagger welds and gasketed joints around the fidley will be sealed with strippable coating and bituminous
coating.
(h) Exterior doors, windows and portlights. The edges of the exterior doors, pilot house, windows and portlights will be
sealed with strippable coating and bituminous coating. When sealing the portlights, the strippable coating will be extended outward
over the adjacent surfaces of the bulkheads. One exterior door will not be sealed; it will be marked "ACCESS DOOR FOR
INSPECTION AND D.H. READINGS."
(i) Louvered openings. All louvered openings on the exterior of vessel will be covered with galvanized sheet metal or
exterior plywood blanks. The blanks will be secured over the louvers. The perimeter of the blank and the door will be sealed with
strippable coating and bituminous coating.
(j) Steering cable guide tube. The steering cable guide tube will be sealed at the stern end of the tube with strippable
coating and bituminous coating. The seal will extend around the cable and the tube opening and will overlap both for a distance of 2
inches.
(k) Stern tube and cooling water connections. The cooling water pipe will be detached at the stern tube connection and the
opening to the stern tube connection, and the opening to the stern tube closed with a plug or cap. The threads will be coated with
pipe thread compound.
(l) Fire stations. The openings resulting from the removal of all fire station valves above the first flange exterior of vessel,
except those fire valves necessary to supply dry air to the windlass and towing engineroom will be blanked with galvanized sheet
metal or exterior grade plywood blanks.
(in) The fire and salvage line blanks will be sealed with strippable coating and bituminous coating.
(n) Engine order telegraph. The engine order telegraph on the lifeboat deck will be sealed with strippable coating and
bituminous coating. The junction of the pedestal and deck will be similarly sealed.
(o) Windlass cover. A cover will be fabricated and installed over the anchor windlass, blanked hawse pipe openings, and
the forepeak access. The cover will be fabricated from minimum No. 18 gauge galvanized sheet metal. All top and vertical edges will
be reinforced by 1-x1-x1/8-inch angle irons. A coaming of 1-x1-x1/8-inch angle iron will be tack welded to the deck around the
windlass. The angle irons will be positioned with one face toward the deck and the vertical face toward the windlass. The size and
shape of the coaming will be such that the sheet metal fits snugly over the vertical faces. The cover will be fastened to the coaming
by No. 12 sheet metal screws spaced approximately 2 feet apart. Apertures between the coaming and the deck will be filled with
bituminous coating. All joints and seams will be covered with strippable coating and bituminous coating.
(p) Dehumidification piping system . The connecting points of air ducts to areas being dehumidified will be sealed with
strippable coating and bituminous coating.
Change 2
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