ANSI Z21.18-2007 CSA 6.3-2007

American National Standard/ CSA Standard For

Gas Appliance Pressure

Regulators

AMERICAN NATIONAL STANDARD ANSI Z21.18-2007

CSA STANDARD CSA 6.3-2007

Third Edition - 2007

This Standard is based on the Standard for Gas Appliances Pressure Regulators ANSI Z21.18-2000 • CSA 6.3-2000

and Addendas Z21.18a-2001 • CSA 6.3a-2001, Z21.18b-2005 • CSA 6.3b-2005

APPROVED

IGAC

July 19, 2007

American National Standards Institute, Inc.

September 14, 2007 Interprovincial Gas Advisory Council

Effective in Canada May 1, 2009

CSA AMERICA INC.

8501 East Pleasant Valley Road Cleveland, Ohio 44131

Standard Developer

CANADIAN STANDARDS ASSOCIATION

5060 Spectrum Way, Suite 100 Mississauga, Ontario, Canada L4W 5N6

Published - October 2007

Copyright © 2007 Canadian Standards Association

Permission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by public authorities. Those desiring permission for other republication should consult Canadian Standards Association, 5060 Specrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.

Copyright © 2007 CSA America, Inc.

Permission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by public authorities. Those desiring permission for other republication should consult CSA America, Inc., 8501 East Pleasant Valley Road, Cleveland, Ohio 44131.

Canadian Standards Association

The Canadian Standards Association (CSA), under whose auspices this National Standard has been produced, was chartered in 1919 and accredited by the Standards Council of Canada to the National Standards system in 1973. It is a not-for-profit, nonstatutory, voluntary membership association engaged in standards development and certification activities.

CSA standards reflect a national consensus of producers and users — including manufacturers, consumers, retailers, unions and professional organizations, and governmental agencies. The standards are used widely by industry and commerce and often adopted by municipal, provincial, and federal governments in their regulations, particularly in the fields of health, safety, building and construction, and the environment.

Individuals, companies, and associations across Canada indicate their support for CSA’s standards development by volunteering their time and skills to CSA Committee work and supporting the Association’s objectives through sustaining memberships. The more than 7000 committee volunteers and the 2000 sustaining memberships together form CSA’s total membership from which its Directors are chosen. Sustaining memberships represent a major source of income for CSA’s standards development activities.

The Association offers certification and testing services in support of and as an extension to its standards development activities. To ensure the integrity of its certification process, the Association regularly and continually audits and inspects products that bear the CSA Mark.

In addition to its head office and laboratory complex in Toronto, CSA has regional branch offices in major centres across Canada and inspection and testing agencies in eight countries. Since 1919, the Association has developed the necessary expertise to meet its corporate mission: CSA is an independent service organization whose mission is to provide an open and effective forum for activities facilitating the exchange of goods and services through the use of standards, certification and related services to meet national and international needs.

L’Association canadienne de normalisation (CSA), sous les auspices de laquelle cette Norme nationale a été préparée, a reçu ses lettres patentes en 1919 et son accréditation au sein du Système de Normes nationales par le Conseil canadien des normes en 1973. Association d’affiliation libre, sans but lucratif ni pouvoir de réglementation, elle se consacre à l’élaboration de normes et à la certification.

Les normes CSA reflètent le consensus de producteurs et d’usagers de partout au pays, au nombre desquels se trouvent des fabricants, des consommateurs, des détaillants et des représentants de syndicats, de corps professionnels et d’agences gouvernementales.

L’utilisation des normes CSA est très répandue dans l’industrie et le commerce, et leur adoption à divers ordres de législation, tant municipal et provincial que fédéral, est chose courante, particulièrement dans les domaines de la santé, de la sécurité, du bâtiment, de la construction et de l’environnement.

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Outre son siège social et ses laboratoires à Toronto, la CSA possède des bureaux régionaux dans des centres vitaux partout au Canada, de même que des agences d’inspection et d’essai dans huit pays. Depuis 1919, l’Association a parfait les connaissances techniques qui lui permettent de remplir sa mission d’entreprise, à savoir la CSA est un organisme de services indépendant dont la mission est d’offrir une tribune libre et efficace pour la réalisation d’activités facilitant l’échange de biens et de services par l’intermédiaire de services de normalisation, de certification et autres, pour répondre aux besoins de nos clients, tant à l’échelle nationale qu’internationale.

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Canada L4W 5N6

Pour plus de renseignements sur les services de

la CSA, s’adresser à Association canadienne de normalisation 5060, Spectrum Way, bureau 100 Mississauga, Ontario, Canada L4W 5N6

American National Standards Insititute

The American National Standards Institute (ANSI), Inc. is the nationally recognized coordinator of voluntary standards development in the United States through which voluntary organizations, representing virtually every technical discipline and every facet of trade and commerce, organized labor and consumer interests, establish and improve the some 10,000 national consensus standards currently approved as American National Standards.

ANSI provides that the interests of the public may have appropriate participation and representation in standardization activity, and cooperates with departments and agencies of U.S. Federal, state and local governments in achieving compatibility between government codes and standards and the voluntary standards of industry and commerce.

ANSI represents the interests of the United States in international nontreaty organizations such as the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). The Institute maintains close ties with regional organizations such as the Pacific Area Standards Congress (PASC) and the Pan American Standards Commission (COPANT). As such, ANSI coordinates the activities involved in the U.S. participation in these groups.

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Responsibility of approving American National Standards rests with the

American National Standards Institute, Inc.

25 West 43rd Street, Fourth Floor New York, NY

10036

Preface

This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of gas appliance pressure regulators. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on gas appliance pressure regulators designed for utilization of gas. There are risks of injury to persons inherent in appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this standard are intended to help reduce such risks while retaining the normal operation of the appliance.

Nothing in this standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of gas appliance pressure regulators, the safety construction and performance of which may exceed the various provisions specified herein. In its preparation, full recognition has been given to possibilities of improvement through ingenuity of design. As progress takes place, revisions may become necessary. When they are believed desirable, recommendations or suggestions should be forwarded to the CSA America, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131, or the Chairman of the CSA Technical Committee on Gas Appliances and Related Accessories, 5060 Spectrum Way, Suite 100, Missiaaauga, Ontario, Canada L4W 5N6.

Safe and satisfactory operation of a gas appliance pressure regulator depends to a great extent upon its proper installation, use and maintenance. It should be installed, as applicable, in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54; or the Natural Gas and Propane Installation Code,

CSA B149.1.

Users of this American National Standard/CSA Standard are advised that the devices, products and activities within its scope may be subject to regulation at the Federal, Territorial, Provincial, state or local level. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this standard, the Federal, Territorial, Provincial, state or local regulation should be followed.

THIS STANDARD IS INTENDED TO BE USED BY THE MANUFACTURING SECTOR AND BY THOSE APPLYING THE EQUIPMENT AND BY THOSE RESPONSIBLE FOR ITS PROPER INSTALLATION. IT IS THE RESPONSIBILITY OF THESE USERS TO DETERMINE THAT IN EACH CASE THIS STANDARD IS SUITABLE FOR AND APPLICABLE TO THE SPECIFIC USE THEY INTEND.

CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute, Inc., require that action be taken to reaffirm, revise or withdraw this standard no later than five (5) years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute, Inc., 25 West 43rd Street, Fourth Floor, New York, N.Y. 10036, (212) 642-4900.

EFFECTIVE DATE: An organization using this standard for product evaluation as a part of its certification program will normally establish the date by which all products certified by that organization should comply with this standard.

History Of The Development Of Standard For Gas Appliance Pressure Regulators

(This History is informative and is not part of the standard.)

With the onset of the Free Trade Agreement between the United States and Canada on January 2, 1988, significant attention was given to the harmonization of the United States and Canadian safety standards addressing gas-fired equipment for residential, commercial and industrial applications. It was believed that the elimination of the differences between the standards would remove potential trade barriers and provide an atmosphere in which North American manufacturers could market more freely in the United States and Canada. The harmonization of these standards was also seen as a step toward harmonization with international standards.

With the formation of joint subcommittees, a Canadian Gas Association Standards Steering Committee on Gas Burning Appliances and Related Accessories was established to parallel Accredited Standards Committees Z21 and Z83, and to support the formation of joint subcommittees. Operating procedures, in accordance with American National Standards Institute procedures, for joint subcommittees were developed and subsequently approved by ANSI on April 1, 1993.

At its July 14, 1993 meeting, the Joint Automatic Gas Controls Subcommittee adopted ANSI Z21.18 for distribution for review and comment as a harmonized standard, in that Z21.18 and CAN1-6.3 were identical in content. The first draft harmonized gas appliance pressure regulator standard was distributed for review and comment during March 1994.

Following reconsideration and modification of the proposed harmonized draft standard for gas appliance pressure regulators, in light of comments received, the joint automatic gas controls subcommittee, at its July 14, 1994 meeting, recommended the proposed standard to the Z21 Committee and the CGA Standards Steering Committee, for approval.

The proposed harmonized standard for gas appliance pressure regulators was approved by the Z21 Committee by letter ballot dated January 17, 1995. The CGA Standards Steering Committee approved the proposed harmonized standard for automatic gas valves by letter ballot dated April 13, 1995.

The first edition of the harmonized Z21/CGA Standard for Gas Appliance Pressure Regulators was approved by the Canadian Interprovincial Gas Advisory Council on October 18, 1995 and by the American National Standards Institute, Inc., on November 15, 1995.

The second edition of the harmonized Z21/CSA Standard for Gas Appliance Pressure Regulators was approved by the Canadian Interprovincial Gas Advisory Council on August 22, 2000, and by the American National Standards Institute, Inc., on September 27, 2000.

This the third edition of the harmonized Z21/CSA Standard for Gas Appliance Pressure Regulators was approved by the Canadian Interprovincial Gas Advisory Council on September 14, 2007, and by the American National Standards Institute, Inc., on July 19, 2007.

The previous editions of the gas appliance pressure regulator standard, and addenda thereto, approved by the American National Standards Institute, Inc. and the Interprovincial Gas Advisory Council, are as follows:

Z21.18-1995 • CGA 6.3-M95 ANSI Z21.18-2000 • CSA 6.3-2000 Z21.18a-1998 • CGA 6.3a-M98 ANSI Z21.18a-2001 • CSA 6.3a-2001 Z21.18b-2000 • CGA 6.3b-M00 ANSI Z21.18b-2005 • CSA 6.b-2005

The following identifies the designation and year of the harmonized standard: ANSI Z21.18-2007 • CSA 6.3-2007

NOTE: This edition of Z21.18 • CSA 6.3, incorporates changes to the 2000 edition and addenda thereto. Changes, other than editorial, are denoted by a vertical line in the margin.

Interprovincial Gas Advisory Council

(June, 2007)

S. Cooke Technical Standards & Safety Authority (Chairman)

D.B. Evans New Brunswick Department of Public Safety (ViceChairman)

B.E. Alberts SaskPower Corporation (Alternate Member)

E.W. Bachellier Government of Nunavut

M. Davidson New Brunswick Department of Public Safety, Technical

(Alternate Member)

W. Drover Government of Newfoundland and Labrador (Alternate Member)

D. Eastman Government of Newfoundland and Labrador

Z.J. Fraczkowski Technical Standards & Safety Authority (TSSA) (Alternate Member)

E.J. Hurd British Columbia Safety Authority (BCSA) (Alternate Member)

W.C. LaRose Alberta Municipal Affairs

W. Lock British Columbia Safety Authority (BCSA)

E. Marotta Human Resources and Social Development Canada

R. McRae Government of the Northwest Territories

V. Pao Manitoba Department of Labour and Immigration

B.W. Reid Dept. of Community Services & Attorney General

J. Renaud Régie du bâtiment du Québec

D.C. Stewart Nova Scotia Department of Environment and Labour

I.R. Tilgner Human Resources and Social Development Canada (Alternate Member)

G.L. Williams SaskPower

C.E. Wolfe Government of Nunavut Community & Government Services

(Alternate Member)

D. Young Government of Yukon Territory

S. Paniri CSA International (Secretary)

Z21/83 Committee on Performance and Installation of Gas Burning Appliances and Related Accessories

DARYL L. HOSLER, Chairman PAUL E. BEACH, Vice Chairman

ALLEN J. CALLAHAN, Manager Standards (Non-Voting)

REPRESENTING AMERICAN ASSOCIATION OF FAMILY AND CONSUMER SERVICES:

JoAnn Emmel

REPRESENTING AMERICAN PUBLIC GAS ASSOCIATION:

Mike Deegan

REPRESENTING ASSOCIATION OF HOME APPLIANCE MANUFACTURERS:

Issac Sargunam

REPRESENTING ATMOS ENERGY:

Ronnie R. Frazier

REPRESENTING BURNER TECHNOLOGY UNLIMITED:

Carl Suchovsky

REPRESENTING CONSUMER:

Virgil Hall

REPRESENTING DIRECT ENERGY CORPORATION:

Geoff Atkinson

REPRESENTING GAS APPLIANCE MANUFACTURERS ASSOCIATION, INC.

REPRESENTING HEARTH, PATIO & BARBECUE ASSOCIATION:

Thomas Stroud

REPRESENTING INDIVIDUAL MEMBERS:

Daryl Hosler R. Michael Martin

REPRESENTING INDUSTRIAL HEATING EQUIPMENT ASSOCIATION:

Doug Perry

Z21/83 Committee on Performance and Installation of Gas Burning Appliances and Related Accessories (con’t.)

REPRESENTING KEYSPAN ENERGY:

Edward Angelone

REPRESENTING LACLEDE GAS COMPANY:

Amy Sherwin

REPRESENTING LOWE’S COMPANIES, INC.:

Jeff Jacumin

REPRESENTING NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION:

Richard Simons

REPRESENTING NATIONAL PROPANE GAS ASSOCIATION:

Bruce J. Swiecicki

REPRESENTING NORTH AMERICAN ASSOCIATION OF FOOD EQUIPMENT MANUFACTURERS:

Charlie Souhrada Terry Wiseman (Alternate)

REPRESENTING SOUTHERN CALIFORNIA GAS COMPANY:

Lance DeLaura

REPRESENTING UNDERWRITERS LABORITORIES:

Robert Wozniak Travis Hardin (Alternate)

REPRESENTING U.S. CONSUMER PRODUCT SAFETY COMMISSION:

Donald M. Switzer

REPRESENTING U.S. DEPARTMENT OF ENERGY:

Cyrus Nasseri

REPRESENTING U.S. DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT:

Victor J. Ferrante

CSA Technical Committee On Gas Appliances And Related Equipment

(April, 2007)

Z.J. Fraczkowski Technical Standards & Safety Authority (TSSA) (Chairman)

G.L. Williams SaskPower Corporation (Vice Chairman)

B.E. Alberts SaskPower Corporation (Alternate Member)

D. Baxter Enbridge Gas Distribution

M. Binet Gaz Métro Inc.

M. Blanchet Gaz Métro Inc. (Alternate Member)

J. Boros Rheem Manufacturing Company

T. Brennan Natural Resources Canada

C. Gibbs Consumers’ Association of Canada (Alternate Member)

A. Gould Union Energy (Alternate Member)

E. Grzesik Ontario Ministry of Energy

W.T. Harrigill Rheem Manufacturing Company

E.J. Hurd British Columbia Safety Authority (BCSA) (Alternate Member)

D. Jamieson CFM Corporation

J.M. Jones JM Jones Consulting Inc

C. Jorgenson British Columbia Safety Authority (BCSA) (Alternate Member)

S. Katz S. Katz and Associates Inc. (Alternate Member)

J.P. Krill Union Energy

S. Lajoie Gaz Métro Inc. (Alternate Member)

J.Marshall Technical Standards & Safety Authority (Alternate Member)

J. Overall Union Gas Limited (Alternate Member)

T. Poulin GSW Water Heating A Div. of GSW Water Products Inc.

G.B. Prociw Union Gas Limited

M. Thomas Natural Resources Canada CANMET Energy Technology Centre

(Alternate Member)

S. Krsikapa Canadian Standards Association (Secretary)

Joint Technical Advisory Group On Standards For Automatic Gas Controls

SCOTT DALEY, Chairman

REPRESENTING GAS COMPANIES:

Scott Daley Chuck Otis

REPRESENTING MANUFACTURERS:

Terrence Adams

Peter Baker (Alternate) Paul Beach

John Bieritz (Alternate) Kevin Carlisle

Thomas. Chodaki David Fallon Greg Filkovski

Paul Finn (Alternate) Alex Gafford (Alternate) Jim Jollay

Don Kasprzyk Paul Kiningham

Florin Lazar (Alternate) Gerard Longinetti (Alternate) Ken Minkler

Kevin Norby John Schlachter

REPRESENTING LPGAS DISTRIBUTORS:

Gene McPherson

REPRESENTING REGULATORY OFFICIALS:

Richard Cowan Barbara Hennessey Edward Hurd

Tom Stroud Franklin Switzer John Voorhees

Contents

Part I Construction

Page

1. Scope 1

2. Data To Be Furnished By The Manufacturer 3

3. Assembly 4

4. Connections 4

5. Bolts And Screws 5

6. Adjustments 5

7. Strength 5

8. Vent Connections And Vent Limiters 6

9. Springs 6

10. Finish 6

11. Materials 6

12. Instructions 7

13. Marking 7

Part II Performance

1. General 9

2. Test And Reference Gases 9

3. Test Pressures 10

4. Leakage 10

5. Strength And Deformation 11

6. Mounting Regulator For Test 12

7. Pressure Drop Capacity 13

8. Outlet Pressure Range 15

9. Range Of Regulation Capacity 16

10. Regulators Designated To Operate At Pilot Flow Rate 18

11. Regulators For Use On Domestic Gas Ranges 20

12. Integrity Of Operation 23

13. Continued Operation 28

14. Resistance To Permanent Damage At Excessive Supply Pressure 30

15. Vent Limiter 31

16. Marking Material Adhesion And Legibility 32

Part III Negative Pressure Regulators Performance

1. General 33

2. Test and Reference Gases 33

3. Test Pressures 33

4. Leakage 33

5. Strength And Deformation 33

6. Mounting Regulator For Test 33

7. Pressure Drop Capacity 33

8. Outlet Pressure Range 34

9. Range of Regulation Capacity 35

10. Regulators Designated To Operate At Pilot Flow Rate 37

11. Regulators For Use On Domestic Gas Ranges 38

12. Integrity Of Operation 38

13. Continued Operation 42

    Contents (Continued)

14. Vent Limiter 44

15. Marking Material Adhesion And Legibility 44

Tables

Table I Minimum Thread Length And Length To Shoulder 46

Table II Inlet Test Pressure 47

Table III 48

Table IV 48

Table V Allowable Outlet Pressure Tolerances For Nonadjustable Regulators 49

Table VI Maximum Allowable Vent Limiter Venting Rate 49

Figures

Figure 1. 125 lb.Cast Iron Pipe Flange Body Connection 52

Figure 2. Typical Arrangement of Test Apparatus 53

Figure 3. Range Of Regulation Curves For Nonadjustable Regulators 54

Figure 4. Range of Regulation Curves for Adjustable Regulators 55

Figure 5. Range of Regulation Curves for Multi-Stage Regulators 56

Figure 6. Range of Regulation Curves for Convertible Regulators 57

Figure 7. Range of Variable Load Capacity (Typical) 58

Figure 8. Typical Curves for Evaluations in 2.11.5 58

Figure 9. Arrangement for Integrity of Operation Test 59

Figure 10. Integrity of Operation Curve 60

Figure 11. Typical Arrangement of Test Apparatus for Negative Pressure Regulators 61

Figure 12. Range of Regulation Curves for Nonadjustable Negative Pressure Regulators 62

Figure 13. Range of Regulation Curves for Adjustable Negative Pressure Regulators 63

EXHIBIT A Items Unique To Canada 65

EXHIBIT B List Of Reference Standards 67

Part IV Manufacturing And Production Tests 69

Part V Definitions 71

APPENDIX A Table Of Conversion Factors 75

NOTE

This standard contains SI (Metric) equivalents to the yard/pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. (Standard for use of the International System of Units (SI): The Modern Metric System, IEEE/ASTM SI I0 or Metric Practice Guide, CAN/CSA Z234.1 are used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and an equivalent value in other units, the first stated is to be regarded as the requirement. The given equivalent value may be approximate. If a value for a measurement and an equivalent value in other units, are both specified as a quoted marking requirement, the first stated unit, or both shall be provided.

American National Standard/CSA Standard For Gas Appliance Pressure Regulators

Part I: Construction

1.1 Scope

1.1.1

Types of Regulators. This standard applies to individual gas appliance pressure regulators, which are not a part of a combination control (see Part V, Definitions), constructed entirely of new, unused parts and materials, hereinafter referred to as regulators, intended for application on individual gas appliances.

This standard also applies to negative gas appliance pressure regulators (see Part V, Definitions). The performance of negative pressure regulators is covered under Part III of this standard.

Compliance of a device with this standard does not imply that such device is acceptable for use on gas appliances without supplemental tests with the device applied to the particular appliance design.

Components performing functions other than those of a gas appliance pressure regulator shall comply with the applicable American National Standards.

1.1.2

Types of Gases. This standard applies to regulators for operations with natural, manufactured and mixed gases, liquefied petroleum gases and LP gasair mixtures.

1.1.3

Regulators shall be classified in accordance with their intended application with reference to inlet pressures as follows:

Rated Inlet Pressure

/

2

1 psi (3.5 kPa)

2 psi (13.8 kPa)

5 psi (34.5 kPa)

1.1.4

Types of Application. This standard applies to regulators for the following general types of application:

1. Main burner load application;

   
   

2. Pilot burner load application;

   
   

3. Main burner and pilot burner load application to control a minimum pilot flow rate of: 1. 0.15 ft3/hr (1.18 cm3/s), or

2. 0.50 ft3/hr (3.93 cm3/s); or