Refrigeration Piping and Heat Transfer Components

ASME Code for Pressure Piping, B31

A N A M E R I C A N N A T I O N A L S T A N D A R D

Copyright 2007 by the American Society of Mechanical Engineers.

No reproduction may be made of this material without written consent of ASME.

c

ASME B31.5-2006

(Revision of ASME B31.5-2001)

Refrigeration Piping and Heat Transfer Components

ASME Code for Pressure Piping, B31

AN AMERICAN NA TIONAL S T AND ARD

Three Park Avenue • New York, NY 10016

Date of Issuance: July 20, 2007

The next edition of this Code is scheduled for publication in 2009. This Code will become effective 6 months after the Date of Issuance. There will be no addenda issued to this edition.

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CONTENTS

Foreword v

Committee Roster vi

Introduction viii

Summary of Changes x

iii

Nonmandatory Appendices

1. Referenced Standards 75

2. Preparation of Technical Inquiries 78

3. Selecting Applicable Piping Codes 79

iv

FOREWORD

(06)

The need for a national code for pressure piping became increasingly evident from 1915 to 1925. To meet this need, the American Engineering Standards Commit- tee (later changed to American Standards Association, then changed to United States of America Standards Institute, and now known as the American National Standards Institute) initiated project B31 in March 1926, at the request of the American Society of Mechanical Engineers and with that Society the sole administrative sponsor. Because of the wide field involved, Sectional Committee B31, later changed to Standards Committee, was composed of representatives of some 40 different engineering societies, industries, government bureaus, institutes, and trade associations. After several years’ work, the first edition was published in 1935 as an Amer- ican Tentative Standard Code for Pressure Piping.

In order to keep the Code abreast of current develop- ments in piping design, welding, stress computations, new dimensional and material standards and specifica- tions, and increases in the severity of service conditions, revisions, supplements, and new editions of the Code were published as follows:

B31.1-1942 American Standard Code for Pressure Piping

B31.1a-1944 Supplement 1

B31.1b-1947 Supplement 2

B31.1-1951 American Standard Code for Pressure Piping

B31.1a-1953 Supplement 1 to B31.1-1951

B31.1-1955 American Standard Code for Pressure Piping

In 1952, a new section of the Code was published to cover Gas Transmission and Distribution Piping Sys- tems. In 1955, after a review by B31 Executive and Sec- tional Committees, a decision was made to develop and publish other industry sections as separate code docu- ments of the American Standard Code for Pressure Piping.

The first edition of Refrigeration Piping was published as ASA B31.5-1962 superseding Section 5 of B31.1-1955. This Section was revised in 1966. Following approval by the Sectional Committee and the sponsor, this revi- sion was approved by the United States of America Standards Institute on September 8, 1966, and desig- nated USAS B31.5-1966. Revision of this Section was approved on April 18, 1974, by the American National Standards Institute and designated ANSI B31.5-1974.

In December 1978, the American National Standards Committee B31 was reorganized as the ASME Code for Pressure Piping, B31. Committee under procedures developed by the American Society of Mechanical Engi- neers and accredited by the American National Stan- dards Institute. The Code designation was also changed to ANSI/ASME B31.

Previous editions of this Code include those of 1983, 1987, 1989, 1992, and 2001. The 2006 Edition of the Code is a compilation of the 2001 Edition and the B31.5a-2004 Addenda.

In this, the 2006 Edition, the values in the tables have been updated to keep the Code consistent with industry trends.

This Code was approved as an American National Standard on November 6, 2006.

v

ASME B31 COMMITTEE

Code for Pressure Piping

(The following is the roster of the Committee at the time of approval of this Code.)

COMMITTEE OFFICERS

D. R. Frikken, Chair

K. C. Bodenhamer, Vice Chair

P. D. Stumpf, Secretary

COMMITTEE PERSONNEL

H. A. Ainsworth, Consultant

R. J. T. Appleby, ExxonMobil Upstream Research Co.

C. Becht, Becht Engineering Co.

A. E. Beyer, Fluor Daniel

K. C. Bodenhamer, Enterprise Products Co.

J. S. Chin, El Paso Corp.

D. L. Coym, Worley Parsons

D. M. Fox, Atmos Energy

J. W. Frey, Stress Engineering Service, Inc.

D. R. Frikken, Becht Engineering Co.

R. A. Grichuk, Fluor Corp.

L. E. Hayden, Jr., Consultant

G. A. Jolly, Vogt Valves Flowserve Corp.

W. J. Koves, UOP LLC

R. P. Merrill, Evapco, Inc.

J. E. Meyer, Louis Perry & Associates, Inc.

E. Michalopoulos, City of Kozani, Greece

M. L. Nayyar, Bechtel Power Corp.

T. J. O’Grady II, Veco Alaska

R. G. Payne, Alstom Power, Inc.

J. T. Powers, Parsons Energy & Chemicals

E. H. Rinaca, Dominion Resources, Inc.

M. J. Rosenfeld, Kiefner & Associates, Inc.

R. J. Silvia, Process Engineers and Constructors, Inc.

W. J. Sperko, Sperko Engineering Services, Inc.

G. W. Spohn III, Coleman Spohn Corp.

A. L. Watkins, First Energy Corp.

P. D. Flenner, Ex-Officio Member, Flenner Engineering Services

R. W. Haupt, Ex-Officio Member, Pressure Piping Engineering Associates, Inc.

B31.5 REFRIGERATION PIPING SECTION COMMITTEE

R. P. Merrill, Chair, Evapco, Inc.

1. A. Appleton, Vice Chair, Refrigeration Systems Co.

2. Vasquez, Secretary, The American Society of Mechanical Engineers

M. R. Braz, Carter & Burgess

P. C. DuPernell, Consultant

R. J. Ferguson, Xaloy, Inc.

H. W. Kutz, York International: A Johnson Controls Corp.

P. G. Papavizas, Baltimore Aircoil Co.

G. W. Price, York International: A Johnson Controls Corp.

W. R. Sizemore, FES Systems, Inc.

S. A. Walter, Vilter Manufacturing Corp.

D. F. Witte, Speer Mechanical

W. V. Richards, Corresponding Member, Consultant

J. A. Gruber, Honorary Member, Wheatland Tube Co.

F. T. Morrison, Honorary Member, Baltimore Aircoil Co.

R. C. Schmidt, Honorary Member, York Intern