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This recommended practice (RP) covers materials and fabrication requirements for new 1¼Cr-Mo steel heavy wall pressure vessels and heat exchangers for high-temperature, high-pressure hydrogen service. It applies to vessels that are designed, fabricated, certified, and documented in accordance with ASME Section VIII, Division 1 or Division 2. This document may also be used as a resource for equipment fabricated of 1Cr-½Mo Steel. This document may also be used as a resource when planning to modify an existing heavy wall pressure vessel.

The interior surfaces of these heavy wall pressure vessels may have an austenitic stainless steel or ferritic stainless steel weld overlay or cladding to provide additional corrosion resistance.

For this recommended practice, “heavy wall” is defined as a shell thickness 2 in. (50 mm) or greater, but less than or equal to 4 in. (100 mm) at the time of mill heat treatment.

Although outside of its scope, this document can be used as a resource for vessels down to 1 in. (25 mm) or lower in shell thickness, with changes defined by the Purchaser.

Multilayer vessels are outside the scope of this document. Likewise, this recommended practice is not intended for use for equipment operating above 825 °F (440 °C) or in the creep range. API RP 934-E covers these higher temperature applications.

Product Details

Edition:

2nd

Published:

02/01/2019

Number of Pages:

25

File Size:

1 file , 1.2 MB

Redline File Size:

2 files , 5.6 MB

Product Code(s):

C934C02, C934C02, C934C02, C934C02, C934C02, C934C02

Note:

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Covers many of the “lean,” “standard”, amd “super” grades of duplex stainless steels (DSS) most commonly used within refineries. The definitions of these terms have not been firmly established by the industry, and vary between literature references and materials suppliers. Table 1 shows how the various grades are being classified into “families” for the purpose of this report. The UNS numbers of the standard grades being used for corrosive refining services include S31803 and S32205, while the upper grades include S31260, S32520, S32550, S32750, S32760, S39274, and S39277. The grades which are labeled as “semi-lean” include S32304 and UNS S32003, have either lower Cr or Mo than the standard grades, and are used in some process services that are less aggressive. These alloys and lean duplexes such as S32101, have also been used for storage tanks and structural applications primarily for their higher strength compared to carbon steel (CS). It is observed that new DSS alloys are being introduced and are likely to continue to be introduced. These new grades can be reasonably placed in the context of this discussion based on their composition.

The product forms within the scope are tubing, plate, sheet, forging, pipe and fittings for piping, vessel, exhcnager, and tank applications. The use of DSS for tanks is addressed by API 650, Appendix X. Later revisions of this report may consider expanding the scope to include casting and other product forms for pumps, valves, and other applications. Use of DSS as a cladding is also not included within the scope of this document.

Product Details

Edition:

1st

Published:

05/01/2008

Number of Pages:

26

File Size:

1 file , 770 KB

Product Code(s):

C934C01R, C934C01, C934C01R, C934C01, C934C01, C934C01R

Note:

This product is unavailable in Cuba, Iran, North Korea, Syria