ASME B16.28

ASME B16.28 for wrought carbon and alloy steel buttwelding short radius elbows and returns.

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ASME B16.28 fittings

ASME B16.28 is a standard that provides the requirements for the fabrication and installation of butt-welded short radius elbows and returns. These fittings are commonly used in piping systems to change the direction of flow and are typically manufactured from carbon steel, stainless steel, or other alloy materials.

The application of ASME B16.28 is in industries that involve the transportation of fluids or gases such as oil and gas, chemical processing, power generation, and water treatment. These fittings are designed to withstand high pressure and temperature variations, making them suitable for use in a wide range of applications. The standard provides guidelines on the dimensions, tolerances, materials, and testing requirements for the manufacture and installation of short radius elbows and returns, ensuring their safe and effective use in piping systems.

The term wrought denotes fittings made of pipe, tubing, plate, or forgings.

Fabricated Fittings

Fabricated fittings employing intersection welds are not covered by this Standard. Design of such fittings is covered in the ASME B31, Code for Pressure Piping or the ASME Boiler and Pressure Vessel Code.


Referenced Standards. Standards and specifications adopted by reference in this Standard are shown in Annex B, which is part of this Standard. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead the specific edition reference is identified in Annex B. A product made in conformance with a prior edition of reference standards and in all other respects conforming to this Standard will be considered to be in conformance.

Codes and Regulations. A fitting used under the jurisdiction of the ASME Boiler and Pressure Vessel Code, the ASME Code for Pressure Piping, or a governmental regulation is subject to any limitation of that code or regulation. This includes any maximum temperature limitation or rule governing the use of a material at low temperature.

Service Conditions

Criteria for selection of fitting types and materials suitable for particular fluid service are not within the scope of this Standard.


Installation welding requirements are outside the scope of this Standard. Installation welding shall be done in accordance with the applicable piping code or regulation covering the piping system into which the fittings are installed.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes