scope:

This standard describes the various types and classes of cold-water fireservice- type meters in sizes 3 in. (80 mm)* through 10 in. (250 mm) and the materials and workmanship used in their fabrication. A fire-service meter shall consist of one of the following:

1. A combination of (1) a mainline meter of the proportional type, either Underwriters Laboratories^† (UL) listed or Factory Mutual Research^‡ (FM) approved, having an unobstructed passageway of essentially the pipe size, for measuring high flow rates; (2) a bypass meter of the appropriate size for measuring low flow rates; and (3) an automatic valve for diverting flow rates other than fire demand through the bypass meter.

2. A combination of (1) a mainline meter of the turbine type (Class II), either UL listed or FM approved; (2) either a UL-listed or an FM-approved fireservice strainer;(3) a bypass meter of the appropriate size for measuring low flow rates; and (4) an automatic valve for diverting flow rates other than fire demand through the bypass meter.

3. A combination of (1) a mainline meter of the turbine type (Class II), either UL listed or FM approved; and (2) either a UL-listed or an FM-approved fire-service strainer.

Purpose

The purpose of this standard is to provide the minimum requirements for cold-water meters-fire-service type

^*Metric conversions given in this standard are direct conversions of US customary units and not those specified in International Organization for Standardization (ISO) standards.

†Underwriters Laboratories, 333 Pfingsten Rd., Northbrook, IL 60062.

‡Factory Mutual Research Corporation, 270 Central Ave., Johnston, RI 02919.