5-14. TANK ASSEMBLY: CLEANING, INSPECTION, AND REPAIR
Drycleaning solvent, P-D-680, used to clean parts is potentially
dangerous to personnel and property. Avoid repeated and prolonged
skin contact. Do not use near open flame or excessive heat. Flash
point of solvent is 100 degrees F - 138 degrees F (38 degrees C - 59
Trisodium-Phosphate is a strong caustic material. Avoid skin contact
and protect eyes. Have water available to flush eyes if any trisodium
phosphate is splashed into them.
Tanks used for flammable liquids must be purged in accordance with
the safety precautions set forth in this paragraph before welding.
a. Cleaning Exterior. Wash all exterior metal surfaces with a solution of trisodium-phosphate (Item
8, App. E) and water; rinse thoroughly and dry. Parts removed during disassembly may be cleaned by
immersing in or wiping with drycleaning solvent (Item 1, App, E).
(1) Materials required.
(a.) Adequate water supply with a large diameter hose long enough to reach the vehicle or tank.
(b.) Compressed air supply and air hose of sufficient length to reach the depth of the tank.
(c.) A sufficient quantity of suitable detergent solution (Item 4, App. E).
(2) Safety precautions.
(a.) The tank being purged must have a static ground during all operations. Caution should be
taken with all tools and metal objects around the tank to ensure no spark will be made.
(b.) Conduct a combustible vapor test reading prior to purging the tank using an explosive
(c.) Only competent personnel, thoroughly instructed in the proper handling and reading of the
explosive meter will conduct vapor tests.
(d.) Conduct a combustible vapor test reading immediately after purging. Under no
circumstances will repair of the tank begin until declared safe
(e.) Discontinue all operations if an electrical storm is
(f.) Eliminate conditions that could cause explosions.
by safety personnel.
threatening or in progress.