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STEEL REMOVABLE HEAD DRUMS131 <br /> 1 . All removable head , UN 1A2 , Steel Drums , 49 CFR § 178 . 504 ( a ) ( 2 ) , that are supplied with clamp <br /> bands , bolts , gaskets and lids must be closed for shipment using only the components supplied <br /> and specified in the design qualification tests for the drum . <br /> a . Place lid with gasket in place , as supplied , on the curl at the top of the drum body. <br /> b . Place bolt ring around the drum head and curl . <br /> c . Using a head compressor, apply force to the top of the drum head assembly to compress <br /> head gasket . <br /> d . Drive bolt into lug until the ends of the bolt ring are as follows : <br /> i . For steel drum thickness ( marked on bottom of drum ) 1 . 3/ 1 . 1 / 1 A : 1 /2 - inch or less ring <br /> gap . <br /> ii . For steel drum thickness ( marked on bottom of drum ) 1 . 1 /0 . 8/ 1 . 1 : 3/8 - inch or less ring <br /> gap . <br /> iii . NOTE : If prescribed ring gap cannot be achieved , torque ring to 75 +/- 5 ftAbs . The <br /> ends of the ring should not be touching , maintain a minimum gap of 1 / 16" . <br /> e . If a head compressor is not available , start bolt into lug , alternating tapping of ring with a <br /> mallet and drive bolt with a wrench , until bolt ring ends meet the above requirements . <br /> f. When ring has been tightened as required , the jam nut must be tightened against the left <br /> lug . <br /> [ 1 ] ISO 15750 - 3 Circular Serrated Closure Type B . ANSI MH2 -2003 § 3 . 1 . 4 <br /> [2 ] ISO 15750-3 Octagonal & Hexagonal Closures Type A . ANSI MH2 -2003 § 3 . 1 . 4 <br /> [ 3 ] ANSI MH2 -2003 § 3 . 2 and 3 . 2 . 4 <br /> 6 <br />