A DOT 4B is a welded or brazed steel cylinder with water capacity (nominal) not over 1,000 pounds and a service pressure of at least 150 but not over 500 psig. Longitudinal seams must be forged lap-welded or brazed.

A DOT 4B is a welded or brazed steel cylinder with water capacity (nominal) not over 1,000 pounds and a service pressure of at least 150 but not over 500 psig. Longitudinal seams must be forged lap-welded or brazed.

DOT-specification 4B, 4BA, 4BW, and 4E cylinders used in liquefied compressed gas service manufactured after December 28, 2022, must be marked with the tare weight or mass weight. Additionally, the cylinder must be permanently marked with the water capacity.

DOT-specification 4B, 4BA, 4BW, and 4E cylinders used in liquefied compressed gas service manufactured after December 28, 2022, must be marked with the tare weight or mass weight. Additionally, the cylinder must be permanently marked with the water capacity.

Section §178.50: Specification 4B welded or brazed steel cylinders Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above.

Section 178.50 - Specification 4B welded or brazed steel cylinders.

§178.50 Specification 4B welded or brazed steel cylinders. (a) Type, size, and service pressure. A DOT 4B is a welded or brazed steel cyl-inder with longitudinal seams that are forged lap-welded or brazed and with water capacity (nominal) not over 1,000 pounds and a service pressure of at least 150 but not over 500 psig. Cyl-

The definition of a DOT 4B cylinder is a welded or brazed steel cylinder containing forged lap-welded or brazed longitudinal seams. It features a nominal water capacity of 1,000 pounds and a service pressure level ranging from 150-500 pounds per square in gauge (PSIG).

A DOT 4B240ET cylinder is a brazed type cylinder made from electric resistance welded tubing. The maximum water capacity of this cylinder is 12 pounds or 333 cubic inches and the service must be 240 psig.

With over 70 years of experience, our quality DOT high pressure, seamless steel cylinders are widely used for shipping, storing, and dispensing industrial gases. Our high pressure cylinders are fabricated from chromium-molybdenum steel and produced in strict compliance with all applicable DOT/TC specifications.