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Process Pipes > Specifications

Specifications for stock standard Process Pipes

Specifications

Grades

Europe

EN 10217-7
Welded steel tubes for pressure purposes
Technical Delivery Conditions - Part 7: Stainless Steel Tubes.

This standard will replace most of the standards for welded stainless tubes and pipes for pressure purposes within the CEN countries.
It is similar to DIN 17457 and SS 219711.

The standard prescribes 100% non-destructive testing. This gives a possible design utilization of 100%, and a weld factor z = 1.0. Heat treatment may be omitted if agreed. The standard inspection is normally in accordance with EN 10204 3.1.

EN 10296-2

Welded circular steel tubes for mechanical and general engineering purposes
Technical Delivery Conditions - Part 2: Stainless Steel Tubes.

This standard will replace most of the standards for welded stainless tubes and pipes for general purposes within the CEN countries.
It is similar to DIN 17455 and SS 219716.

Non-destructive testing of the weld is not mandatory. This gives a possible design utilization of 70%, and a weld factor z = 0.7. Heat treatment may be omitted if agreed. The standard inspection is normally in accordance with EN 10204 3.1. If the base metal is in accordance with EN 10028-7, and the tubemill is PED-approved, it is possible to use these pipes up to category I.

Germany

DIN 17455 Geschweisste Kreisförmige Rohre aus nichtrostenden Stählen für allgemeine Anforderungen.

DIN 17455 is used as one out of three standards for AST's sheet welded pipe. No technological or non-destructive testing is specified for tubes intended for general purposes. The permitted weld factor is v=0.8. Subject to agreement, heat treatment may be omitted. The prescribed hydrostatic testing may be replaced by eddy current testing to SEP 1925.

USA

ASTM A 312/A 312M Seamless and welded austenitic stainless steel pipe.

This standard contains analysis regulations and strength requirements. In addition, certain regulations of ASTM A 999 apply as regards inspection and tolerances. The scope of the sampling inspection to be carried out in respect of technological inspection is stated. Hydrostatic or Eddy Current testing is to be carried out as a 100% inspection. Welding is to be without filler material and the pipes are to be heat treated.

ASTM A 358/A 358M Electric-fusion-welded austenitic chromium-nickel alloy steel pipe for high temperature service.

This standard's class 3 forms the basis for manufacture of AST 254 SMO. Pipes are welded with filler material and are subject to 100% radiographic inspection. The Norwegian standard NORSOK accepts Eddy Current testing as substitute for Radiography.

ASTM A 790/A 790 M Seamless and welded ferritic/austenitic stainless steel pipes.

This standard is similar to ASTM A 312, but intended for duplex grades. It is the base for ASTs stocked stripwelded ANSI pipe of AST 2205 in dimensions with NB 2-4”. The pipes are welded without filler metal, and tested with 100% Eddy Current.

ASTM A 928/A 928M Ferritic/austenitic (duplex) stainless steel pipe electric-fusion-welded with addition of filler metal.

This standard is similar to ASTM A 358, but intended for duplex grades, and this standard's class 3 forms the basis for manufacture of AST 2205. Pipes are welded with filler material and are subject to 100% radiographic inspection. The Norwegian standard NORSOK accepts Eddy Current testing as substitute for Radiography.

Outgoing Standards

Sweden

SS 21 97 11
Stainless steel - pressure vessel tubes, condition 23. Inspection class l.

SS 21 97 13
Stainless steel - pressure vessel tubes, condition 25. Inspection class II.

SS 21 97 16
Stainless steel tubes, condition 34 - pressure vessel tubes welded from plate or strip.

Germany

DIN 17457
Geschweisste Kreisförmige Rohre aus austenitischen nichtrostenden Stählen für besondere Anforderungen.

France

NFA 49-147
Tubes soudés longitudinalement à extrémités lisses pour canalisations et usages généraux.

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