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 result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on boilers designed for the utilization of gas. There are risks of injury to persons inherent in some appliance. The provisions in this standard are intended to reduce such risks while retaining the normal function 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-fired low-pressure steam and hot water boilers, the construction and performance of which may exceed the various provisions may become necessary. When they are believed desirable, recommendations should be forwarded to the Chairman of Accredited 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 Z223.1-1984, and Addenda, A223.1a-1987, manufactures' installation instructions, and local municipal codes.