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 TB 55-1900-201-45/1
g. All riveted seam and butt laps of plating on keel, gunwale, stem, and stern post, should be made over felt
laid in wet red lead, tape or other acceptable alternate methods.
h. Where welding is used to repair damaged keels or gunwales, all approved type electrodes may be used ex-
cept Types E-6012; E-6014 and E-6024. Galvanizing or other equivalent corrosion protection shall be applied after
welding.
i.
In the case of welded type lifeboats, the following procedures should be followed:
(1) Crop the deteriorated area to good metal.
(2) Use round type insert welded from the outside of the shell.
(3) Galvanizing or other equivalent corrosion protection should be applied after all surfaces are clean.
(4) A hose test to determine watertightness of repair will be performed.
(a) Faulty seams in metal air tanks can be repaired usually by resoldering provided that the recondi-
tioned tank will withstand a 1 pound air pressure test without failure.
(b) Approved plastic buoyancy units may be substituted for metal air tanks provided that they are of the
same cubic capacity and shape. Where buoyancy units have been found to be overweight, the following repair proce-
dures should be followed.
(1) The outer wrapping of the unit should be opened to permit drainage of any water in the buoyancy
unit prior to weighing for test.
(2) If the new weight is equal to or less than the sum of the original weight stamped on the name-
plate and an allowance is made of 0.12 pounds per square foot for polystyrene cores, or 0.15 pounds per square foot for
polyurethane core material the buoyancy unit shall be considered satisfactory.
(3) The drainage opening in the outer covering and any other cover defect using fiberglass and resin
should be repaired to insure watertightness.
2-92. Inflatable Lifefloats. All inflatable lifefloats shall be inspected at a military or U.S. Coast Guard approved
servicing facility once each year. During onboard inspections, the surveyor shall observe that the cradle stowage is in
good condition, that the moving parts are properly lubricated and that the seal on the container has not been broken. He
should determine the date on the servicing by examining the date on the servicing certificate.
2-43
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