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 TB 740-97-4
APPENDIX R
DYNAMIC DEHUMIDIFICATION INSTRUCTIONS FOR
BOAT, UTILITY, DIESEL, 26 FOOT
DESIGN 6009
1. General. This appendix provides detailed instructions for preparation of the utility boat, design 6009, for dynamic
dehumidification.
2. Preparation Instructions. a. Disassembly and stowage.
(1) Cockpit. The following items will be removed, identified and stowed in the cockpit:
(a) Hoisting sling.
(b) Ensign staff.
(c) Anchor and line.
(d} Main engine covers.
(e) Canopy with windshield assemblies.
(f) Horn.
(g) Bell.
(h) Bow light.
(2) Exhaust manifold. The clean out plugs will be removed from the manifold, bagged, identified, and secured to
the manifold. The flexible section of the exhaust pipe will be removed and secured in other than operating position.
b. Preparation for Dynamic Dehumidification .
(1) Dehumidified area. The complete interior of the boat will be prepared for dynamic dehumidification.
(2) Cockpit cover. A No. 20 gage, galvanized sheet metal cover will be fabricated to encase the entire interior of
the boat. The cover will be fabricated in three sections. The center section will be positioned over the engine. The edges
of the cover will extend down over the deck coaming and will rest on the deck. The underside of the cover will be fitted with
1/8-x 1-x 1-inch galvanized angles, which will run from coaming to coaming, and will be notched at the ends to fit over the
coaming, generally, as shown on figure 63. The sections will be secured to the coaming with clamps fabricated, generally,
as shown on figure 63. The cover will be provided with holes, of sufficient size, to provide for the introduction of the
dehumidification ductwork and for the mounting of a sensing element contact.
(3) 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) Rudder and shaft. Using strippable coating and bituminous coating, a seal will be placed at the stern tube and at
the rudder post.
(b) Fuel fill deckplate . The fuel fill deckplates will be sealed with strippable coating and bituminous coating.
(c) Hull and deck penetrations. All exterior openings in the hull and deck leading to dehumidified areas will be closed
with caps, plugs, blanks, or pressure-sensitive tape, and sealed with strippable coating and bituminous coating.
(d) Cockpit cover. Apertures between the coaming and the deck and all other joints and seams will be sealed with
strippable coating and bituminous coating.
(e) Dehumidification piping system . The connecting points of all air ducts to areas being dehumidified will be sealed
with strippable coating and bituminous coating. The sealing will be carried over and around flanges, adapters, and other
devices used to attach or introduce the ducts. All joints and seams in the ducts will be similarly sealed.
(4) Dehumidification installation . A dynamic dehumidification system will be installed for the interior of the boats.
Normally one dehumidification machine will service four boats, generally, as shown on figure 62.
(a) Dehumidification machine . A package dehumidifier, single desiccant bed, absorbent type, 10,000 cubic foot
capacity, 110-volt, alternating-current, will be installed, generally, as shown on figure 62. The machine will be mounted on
a stand and protected with a cover fabricated, generally, as shown on figure 64. An extension, terminating in a 90elbow,
will be fitted to the reactivation air outlet on the dehumidification machine in order to extend the outlet beyond the exterior
side of the sheet metal cover The elbow will be turned away from the
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