6-18. GeneralSection V. TANKS AND FRAME(total of 8 holes required). See figure 6-18 forThe tank shells are of durable aluminum con-struction; the frame is of welded sheet metal. Thet a n k a n d f r a m e s w i l l r e q u i r e a m i n i m u m ofmaintenance. Make certain every safety precautionis taken prior to attempting any repair on a tank.6-19. Welding Repairsa. Tanks. No repair will be initiated until thetank has been thoroughly vented and cleaned.Before attempting any welding repair on the tank.drill four ½ inch diameter drain holes in each skidlocation of drilling points. If there is evidence offuel inside the skids when holes are drilled, purget h e s k i d s b y s t e a m c l e a n i n g o r o t h e r s u i t a b lemethod. Test for leaks by filling the tank ap-proximately ¼ full of water; seal all holes in skidexcept one and apply compressed air. Observeinterior of tank for bubbles. Observe necessaryprecautions and weld damaged area in accordancewith standard techniques. Refer to paragraph 6-19d for welding precautions.Figure 6-18. Skid drain holes diagram. (8 holes required).6-18
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