scope:

This standard describes the various types and classes of cold-water fire-service-type meters in sizes 3 in. (75 mm)(Footnote *) 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:

A. A combination of (1) a mainline meter of the proportional type, Underwriter's Laboratory(Footnote †) (UL) listed or Factory Mutual Research(Footnote ‡) (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.

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

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

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

Footnote † - Underwriter's Laboratory, 333 Pfingsten Rd., Northbrook, IL 60062.

Footnote ‡ - Factory Mutual Research Corporation, 1151 Boston-Providence Turnpike, P.O. Box 9102, Norwood, MA 02062.