scope:

PREFACE

This Standard, like all standards prepared by the Canadian Gas Association, is subject to periodic review. Amendments in the form of replacement pages may be issued from time to time. To receive copies of these replacement pages, purchasers of this Standard should complete and return the attached card.

Standards are updated in conjunction with changes in technology and are normally reviewed at least within a five year period. If the Standards Committee, industry and provincial inspection authorities feel the standard requires no change, then the standard may be reaffirmed and only the date is changed.

It should be noted that most CGA standards are published as National Standards of Canada. As the standards conform to the criteria and procedures established by the Standards Council of Canada, the Standard Number designation changes with the CGA prefix being replaced by CAN1 or CAN/CGA.

Although any replacement pages that have been issued will be sold with the Standard, the purchaser must insert them where they apply. Replacement pages will show the date of the publication of the amendment. The effective date of the changes will be shown on the cover page of the amendment and is usually one year after publication. It is the responsibility of the purchaser to maintain h i s copy of the Standard and to retain those pages which have been replaced for reference purposes.