The following safety precautions must be observed before welding tanks used
for flammable Iiquids.
Tank must have a static ground during all operations.
Use caution with all tools and metal objects to Insure that no sparks will be created.
Combustible vapor tests must be performed before and immediately following purg-
ing the tank. Do not begin repair of the tank until declared safe by safety personnel.
Allow only thoroughly trained personnel to conduct vapor tests.
Discontinue all operations If an electrical storm Is threatening or in progress.
Eliminate all conditions which could cause explosions.
Do not wear wool, nylon, silk, rayon or other static electricity generating clothing.
Wear clean cotton clothing with no metal buttons or fittings. Remove all contents
Rubber boots must be worn.
Use cotton rags for cleaning. Do not use material that will generate static electricity.
Repair Tank Assembly.
(1) Conduct combustible vapor test using an acceptable explosive meter (Tester, Combustion Vapor,
If combustible vapor test shows combustible atmosphere in tank, clean tank thoroughly in accor-
dance with TB 750-1047 (refer to paragraph 4-10 for complete cleaning procedures).
(3) Repair all dents, cracks, breaks and holes in tank. Weld ruptured seams and other damaged
areas in accordance with TM 9-237. Replace badly damaged parts.
(4) After tank has been repaired, cleaned, dried and made dust-free, paint exterior with one coat of
rust-inhibiting enamel. Paint in accordance with TM 43-0139.