SRRA_Chapter1

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Chapter IIntroduction to ASME Piping Codes

1) General: ASME Piping Codes give stipulations and guidelines for the

design, materials, manufacture and testing of pressure Piping. Theseare issued by the American Society of Mechanical Engineers, New York.

It is a LIVE code and is revised and updated periodically by issuing new

editions and addendas. It keeps pace with time and is responsive to the

questions from its users.

2) Applicability: The editions and addenda become applicable after six

months from date of issue. Thus, 1st Jan. 2000, the construction of

Piping shall be as per 1998 edition and 1999 addenda. However, for old

contracts spilling over beyond1st Jan 2000, the old applicable edition

and addenda are valid till the completion of contract/upto start-up.

3) Code Interpretation: ASME issue writ ten replies know as

Interpretations to the inquiries concerning technical aspects of the

code and are sent to Edition - subscribers as up-date service.

4) Code Cases: ASME committee meets regularly to consider proposed

additions and revisions to the code. At the same time it may formulate

code cases to clarify Intent of existing requirements. These are

published as code-Cases. It is published along with new editions and

supplements are automatically sent td subscribers of code case book

till new edition is published.

5) Salient Features of ASME Codes: Every ASME Code starts with

specifying the scope of the code in terms of capacity, size and pressure

and other limitations if any. It also deals with and the battery limits and

the areas of code jurisdictions.

The Codes categorize and classify acceptable grades for materials of

construction, for specific applications covered by the codes. The codes also

identify and categorize various methods of construction I fabrication.

The codes specify the required N.D.T. and other inspections. They also specify

the accept I reject criteria.

What is most impor tant about the ASME Code is that they are user friendly,

and keep pace with changing technologies and new materials. No wonder -

the Users and the Manufactures world over have adopted the ASME codes

whole heatedly.

The par ticipants are advised to refer the actual code clauses and extract

information from the latest codes applicable. ASME code is even evolving

document and one has to refer to the latest applicable edition and addenda.

These notes will help in understandings the code, and should not be referredto as the Code it self.


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Statutory Regulations

Pressure Piping Codes - B 31:

The ASME B31 Code for Pressure Piping consists of a number of individually

published Sections.

Rules for each Section have been developed considering the need for

application of specific requirements for various types of pressure piping.Application considered for each Code Section include

B31.1 Power piping: Piping typically found in electric power generating stations,

in industrial and institutional plants, geothermal heating systems, and central

and district heating and Cooling systems;

B31.3 Process Piping: Piping typically found in petroleum refineries, chemical,

pharmaceutical, textile, paper, semiconductor, arid cryogenic plants, and

related processing plants and terminals;

B31.4 Pipeline Transportation Systems for Liquid Hydrocarbons and OtherLiquids: transporting products which are predominately liquid between plants

and terminals,~ and within terminals, pumping, and metering stations;

B31.5 Refrigeration Piping: Piping for refrigerants and secondary coolants;

B31.8 Gas Transportation and Distribution Piping Systems: piping transporting

products which are predominately gas between sources and terminals,

Including compressor, regulating, and metering stations; and gas gathering

pipelines;

B31.9 Building Services Piping: piping typically found in industrial, institutional,commercial, and public buildings, and in multi-unit residences, which does

not require range of sizes, pressures, and temperatures covered in B31 .1;

B31.11 Slurry Transportation Piping Systems: piping transporting aqueous

slurries between plants and terminals, and within terminals, pumping, and

regulating stations.

It is the owners responsibility to select the code Section which almost nearly

applies to a proposed piping installation. Factors to be considered by the

owner include: limitations of the Code Section; jurisdictional requirements;

and the applicability of other codes and standards .All applicable requirementsof the selected Code Section shall be met .For some installations, more than

one Code Section may apply to different parts of the installation.

The latest Edition and addenda issued at least 6 months prior to the original

contract date for the first phase of activity covering a piping system or systems

shall be governing document for all design, materials, fabrication, erection,

examination, and testing for the piping until the completion of the work and

initial operation.

Code Revisions and Updating:

The 1998 Edition of this Code is issued on July 1, 1998. The next Edition is

scheduled for publication on July 1,2001.The use of addenda allows revision


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made in response to public review comments or Code committee actions.

Each addenda is designated by small letter (a, b etc.) suffixed after code

designation, Thus Addenda to B31.1 code (1998 edition) issued in 1999 will be

ASME B 31.1 a-1999, addenda 2000 will be ASME 6 31.1 b-2000 and so on.

ASME issues written replies to inquiries concer ning interpretations of

technical aspects of the Code. The Interpretations are published in a separatepublication in a separate supplement. Periodically certain actions of the ASME

B31 Committee will be published as Cases. The Cases are published in a

separate supplement.

Clauses in the Code are not necessarily numbered consecutively. Such

discontinuities result from following a common outline, insofar as practicable,

for all Code Sections. In this way, corresponding material is correspondingly

numbered in most Code Sections, thus facilitating reference by those who

have occasion to use more than one Section.

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