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RE: [MW:10365] Basic Question

By Materials & Welding

Gentlemen,

 

ASME Boiler and Pressure Vessel Code is divided into separate volumes or more properly, Sections.  Historically, the Code Sections were chapters in a single book but today they are individual books which may be further subdivided.  From any Section of the Code, just before the Table of contents, you can find the layout of the Code.  The following is copied below, in part:

Section I - addresses construction of boilers

Section II - addresses materials and material properties, divided as follows

Part A – ferrous material specifications

Part B – nonferrous material specifications

Part C – Specifications for Welding Rods, electrodes, and filler metals

Part D – Material properties (allowable stresses etc.)

Section III - addresses nuclear power plants and is divided into Division 1, Subsections NA through NH, Division 2 Reactor Containment Structures, Division 3 Transport and storage structures    

Section IV - addresses  construction of heating boilers

Section V - addresses NDE

. . .

Section VIII – addresses unfired pressure vessels with 3 divisions

Section IX – addresses welding and weldor qualification

And so on  to . . .

Section XII – which addresses Transport Tankers.

 

Each section has a unique identifying letter;  for example Section I subsections and paragraphs will begin with the letter P, Section VIII will begin with the letter U and for Section II materials specification all begin with the letter S.  The only material specifications in Part A and Part B are those that have been adopted by the ASME B&PV Code and have corresponding code allowable strength values etc. in Section II, Part D.

 

Typically the material specifications in Section II, Part A or Part B, will be either identical or nearly identical  to the ASTM specification and will be noted as such in the header of the specification.  Part C, specifications for welding consumables, are identical or nearly identical to the AWS A5.X specifications.

 

So for example;   SB-409 UNS N08811, is an adopted (S), i.e. one for which Code allowable strength values appear in Part D, non-ferrous (B) material specification.  The header information states “Identical with ASTM Specification B409-96a except that certification has been made mandatory”.  The specific  plate material has chemistry matching UNS N08811 requirements (Alloy 800HTÒ).

 

I hope this helps.  Let me know if you have any questions.

 

 

John

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Harish Kannepalli
Sent: Tuesday, March 15, 2011 12:25 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:10352] Basic Question

 

Dear Mr Murugesan,

                            Then what is SB, SC & SD in ASME, where some are developed entirely by ASME. Please explain.

2011/3/14 murugesan jeyaraman <jmurugesan@gmail.com>

Hi

 

SA does not mean Section " A"  It is a wrong understanding.

 

There is a standard called ASTM International (ASTM),  known as the American Society for Testing and Materials.

It is an  international standards organization that develops and publishes technical standards for a wide range of materials, products, systems. For example A106, A105, A517 and etc...

 

Here, " A " refers it is ASTM standard, and the number 106, 105, 517 are the designation given to particular type of materials, like  naming that pariticular product with some numbering convention.

 

A 106 - Covers seamless carbon steel pipe for High temperature service

 

A 516 - cover carbon steel plates for High temperature service

 

Refer ASME sec II part A for details about this specifications.

 

Now comes to "SA"  - ASME adopts the above ASTM standard and rename the designation by  putting "SA" to same ASTM standards numbers. now it is called SA106, SA 516 and so on... for your case SA 387 This is spec for  pressure vessel plates of Chromium-Molybdenum

 

Gr-22    This refers to Grade of materials within that specification, There various grades like GR11, Gr 22, Gr 91 , Gr 5, Gr 9 and so on- this classified based on cromium content,

 

Class -2 - Above Gr 22, 22, 9, 91 materials further categorised as class 1 and class 2 based on Mechanical properties(Tensile and Yield strength)

 

B3 - alloying charactersitics for Gr 22 materials (2 1/4 chrome  1 Moly).

 

Piece of advise: You are in learning stage, you have to study more codes and standards, If you are working in a ASME accredited workshop or in a workshop that do  Boiler pressure parts, you will learn a lot ....

 

Or there are lot of online guides, please refer to those guides for basics, you read yourself from codes and standards.

 

Thanks

 

Murugesan

 

 

 

On Sat, Mar 12, 2011 at 8:03 PM, <fire_praves@indiatimes.com> wrote:

Dear Sir s

As I am a novice, please help in some basics

I have come across a material of Specification
SA 387 Gr22 Class 2

Please tell me what is denoted by 387, Gr 22 and Class 2.
Do these figures have any thing to do with strength or chemical composition?

Also for welding this material to a material of same specification, E9018 B3 is mentioned.

Please tell me what is denoted by B3?


Regards,
prv

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regards,

Harish.

 

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