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• To obtain satisfactory test results of theoretical calculation of expected flows or rated capacities, sufficient discharge should be achieved to cause a drop in pressure at the residual hydrant of at least 25 percent, or to flow the total demand necessary for fire-fighting purposes.

This edition of NFPA 291, Recommended Practice for Fire Flow Testing and Marking of Hydrants, was prepared by the Technical Committee on Private Water Supply Piping Systems and released by the Technical Correlating Committee on Automatic Sprinkler

2018年9月27日 · As a voluntary consensus standard, NFPA 291-2019 covers fire flow testing and marking of hydrants. Fire flow tests on water distribution systems exist to determine the rate of flow available at various locations for fire-fighting purposes.

Table 4.10.1 (a) Fire Flow Testing and Marking of Hydrants. Two-Hydrant Flow Test: A Main Capacity Test evaluates the water supply of the fire main at the location of the test hydrant. The information derived from this test is used by city planners and contractors to consider the water supply for general use and fire sprinkler systems.

Get up to speed with the NFPA 291, Recommended Practice for Water Flow Testing and Marking of Hydrants. Ensure you and your team have the latest information.

The Scope, Purpose and Application of NFPA 291 is flow testing and marking of hydrants. To determine rate of flow at various locations for fire-fighting purposes and to indicate deficiencies, such as tuberculation and closed valves. Scope, Purpose, Application

The 2010 NFPA 291: Recommended Practice for Fire Flow Testing and Marking of Hydrants describes testing procedures to determine the rate of flow available at various locations for fire-fighting purposes, classification of hydrants in accordance with their rated capacities, and color coding of hydrants to indicate their class. (Softbound, 15 pp ...

NFPA 291《消防栓水流测试和标记的推荐规程》为消防工程师、承包商、安装人员和有管辖权的机构（AHJs）提供了最新程序，以: 确定消防系统和消防目的在不同位置的可用流速。 根据消防栓的额定容量对其进行分类。 对消防栓进行颜色编码，以指示其等级。 对于2022版NFPA 291，消防栓水流测试和标记的推荐规程，已对推荐规程的目的和应用进行了修订，以澄清其适用性。 2022年版的进一步修改包括:增加了各种消防栓类型的定义。 实地工作所需的设备清单已经修 …

2020年11月10日 · The 2022 edition of NFPA 291: Recommended Practice for Fire Flow Testing and Marking of Hydrants (4.2.2) recommends that fire hydrants should maintain a residual pressure of 20 psi (pounds per square inch), or 1.4 bar, for effective firefighting, as well as to prevent backflow that could contaminate the public water supply.