Monday, September 20, 2010

[MW:7114] RE: 7106] ASTM A790 pipe production

Limesh,

 

I expanded the scopes of both the standards below. SA 790/ASTM A-790, is for duplex pipes welded without filler wires, generally recommended for general corrosive services. ASTM A-928 is on duplex  pipe welded with filler wire. For the second part of your query A-928 would be the appropriate standard.

 

Due to constraint on manufacturing technique (to be welded without filler wire) A/SA-790 have constraints on the maximum wall thickness and schedules, these pipes could be produced. Refer Table X1.1- of this standard for detailed explanations.

 

For  thicker walled pipes A-928 would be a better standard to adopt.

 

 

1.      SA-790/SA-790M-Specification for Seamless  and welded  Ferritic and Austenitc stainless  steel pipes- This specification covers seamless and straight seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures

 

2.      A928/A928M -Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal-- This specification covers electric-fusion-welded steel pipe suitable for corrosive service.

·         Class 1—Pipe shall be double welded by processes using filler metal in all passes and shall be radiographed completely.

 

·         Class 2—Pipe shall be double welded by processes using filler metal in all passes. No radiograph is required.

 

·         Class 3—Pipe shall be single welded by processes using filler metal in all passes and shall be radiographed completely.

·         Class 4—Same as Class 3, except that the weld pass exposed to the inside pipe surface is permitted to be made without the addition of filler metal

·         Class 5—Pipe shall be double welded by processes using filler metal in all passes and shall be spot radiographed

 

 

Thanks.

 

 

Pradip Goswami, P.Eng

Welding & Metallurgical Engineer/Specialist

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M
Sent: Monday, September 20, 2010 7:56 AM
To: Materials & Welding
Subject: [MW:7106] ASTM A790 pipe production

 

Dear All,

 

I have reviewed ASTM A 790, 2004 edition.

Clause no 6.1.1 states that “The pipe shall be made by seamless or an automatic welding process, with no addition of filler metal in the welding operation”.

What welding process normally using to produce this type of pipes?

Why ASTM not interested in welding with addition of filler wire to produce these pipes; at the same time we are using welding technique with addition of filler wire to join these category pipes at our workshop !!!

 

Regards,

 

Limesh

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