scope:

PREFACE

This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of gas-fired low-pressure steam and hot water boilers. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on boilers designed for the utilization of gas.

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-fired low-pressure steam and hot water boilers, the 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 should be forwarded to the Chairman of American National Standards Committee Z21, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131.

Safe and satisfactory operation of a gas-fired low-pressure steam or hot water boiler depends to a great extent upon its proper installation and it should be installed in accordance with the National Fuel Gas Code, ANSI Z223.1-1980, manufacturers' installation instructions, and local municipal codes.