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UN/DOT Closure Requirements

DOT CLOSURE REQUIREMENTS FOR THE 22” DRUM RINGS WITH MULTISEAL GASKET


Per 49 CFR 178.2(c)(1)(ii), the below listed closure and gasket information should be followed

Metal 31A and 31B Closure Descriptions

2” and 3” threaded fittings with all gasket materials except Teflon

3/8-1/2 rotations beyond full/solid gasket contact or minimum torque value of 30 ft-lbs

2” and 3” threaded fittings with Teflon gasket

1/8-3/16 rotations beyond full/solid gasket contact or minimum torque value of 60 ft-lbs

22” drum rings with multiseal gasket Seat the ring by striking with non sparking mallet such as a rubber mallet around the circumference of the ring. Tighten the 5/8” bolt and then restrike the ring with the mallet. Alternate between tightening and striking until the bolt tightening resistance does not change

3/8-1/2” gap between clamp ring ends or minimum torque value of 40 ft-lbs

Poly and Composite IBCs and Non-bulk Containers

6.5” Cap (includes all gaskets and version of cap)

1/8-1/6 rotations beyond full/solid gasket contact or minimum torque value of 120 ft-lbs

6” Heavy Duty Cap and 7” cap (includes all gaskets and version of caps)

1/8-1/6 rotations beyond full/solid gasket contact or minimum torque value of 75 ft-lbs

2” NPS (NPT) Threaded Closure (includes all gaskets and NPS (NPT) plugs, manual or automatic pressure/vacuum vents, and drum/macro valves)

3/8-1/2 rotations beyond full/solid gasket contact or minimum torque value of 20 ft-lbs

2” Buttress Threaded Closure (includes all gaskets and Reike buttress or Entegris buttress threaded plugs, draw tubes, dry breaks, drum valves, and macro-valve)

1/8-3/16 rotations beyond full/solid gasket contact or minimum torque value of 25 ft-lbs

Bottom drain valves

Screw in until 0-3 threads remain visible. The exterior compression clamp should be tightened until it cannot be rotated around the tabulation. A leak test per 49 CFR 178.813 is required after valve installation

Want to keep these instructions handy? UN/DOT Closure Instructions

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