The ASME code for cryogenic pipes relates primarily to the ASME SA-333/SA-333M standard, which specifies specifications for seamless welded steel pipes for cryogenic use and other uses with notched toughness requirements. The following is an overview of the key points regarding ASME SA-333/SA-333M code for medium and low temperature pipes:
Chemical composition
The chemical composition of ASMESA333-6 seamless steel pipe is strictly controlled to ensure its performance at low temperatures. For example, the carbon content ≤ 0.30%, and the manganese content is between 0.29~1.06%.
Mechanical Properties
For ASMESA333-6 seamless steel pipes, there are specific mechanical property requirements, including a minimum tensile strength of 415 MPa, a yield strength of 240 MPa, and an elongation of 30%.
The typical impact test temperature is -45°C, which means that the steel pipe still has sufficient strength and toughness at this low temperature.
Specifications
The outer diameter ranges from 21.3mm to 762mm, and the wall thickness ranges from 2.0mm to 140mm.
Mode of production
The production methods of steel pipes include hot rolling, cold drawing, and hot expansion.
Delivery Status
The steel pipe is delivered in the state of positive heat treatment, and the heat treatment process is to keep it warm at 900°C~930°C for 10~20 minutes, and then air cooled.
Other requirements
The product shall meet the requirements of TSG D7002 pressure piping element type test rules.
It is important to note that the ASME code also includes other standards related to cryogenic piping, such as ASME B31.3 (Process Piping Code), which applies to a wide range of piping systems, including cryogenic plants. In addition, ASME has other standards for components such as steel pipes, fittings, valves, flanges, etc., which may also be indirectly related to the design and manufacture of cryogenic pipes.
In summary, ASME SA-333/SA-333M is an important reference specification in the design and manufacture of cryogenic pipes, which specifies in detail the key requirements such as chemical composition, mechanical properties, production methods, and delivery status of steel pipes.
