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Analysis of Fire Protection Pipes

Fire protection pipe refers to the pipe material used for fire-fighting, connecting fire-fighting equipment, and transporting fire-fighting water, gas or other media. Since the fire-fighting pipeline is often in a static state, the requirements for the pipeline are relatively strict, and the pipeline needs to be pressure resistant, corrosion resistant, and high temperature resistant.

Fire protection pipeline classification: ductile water supply cast iron pipe, hot-dip galvanized steel pipe, stainless steel pipe, alloy pipe and composite pipe, etc.

Fire protection pipeline installation process: Installation preparation → dry pipe installation → alarm valve installation → stand pipe installation → spraying layered dry branch pipe, fire hydrant and branch pipe installation → water flow indicator, fire water pump, high water tank, water pump coupler installation → pipeline pressure test → pipeline flushing → spray head branch pipe installation (system comprehensive pressure test and flushing) → throttle device installation → alarm valve fittings, fire hydrant fittings, sprinkler head installation → system water test adjustment

General requirements for the main points of fire protection pipeline connection technology:

(1) When the pipes of the fire hydrant water supply system adopt hot-dip galvanized steel pipes on the inner and outer walls, they should not be welded. When the system pipeline adopts non-corrosive inner wall pipeline, it can be connected by welding, but the pipeline welding should meet the relevant requirements. The pipes of the automatic sprinkler system (behind the alarm valve) cannot be welded, but threaded, grooved pipe joints or flange connections should be used.

(2) Galvanized steel pipes with pipe diameter > 100mm for fire hydrant water supply system shall be connected by flange or groove. Automatic sprinkler system pipe diameter > 100mm is not clear and cannot use threaded connection. It is only required that flange connections or groove connection points should be provided at a certain distance on pipe sections with pipe diameter ≥ 100mm.

(3) For fire hydrant water supply system and automatic sprinkler system pipes, threaded flanges are recommended when flanged connection is used, and secondary galvanizing is required when welding flanges are used.

(4) When any pipe section needs to change the pipe diameter, reducer pipe joints and pipe fittings that meet the standard should be used.

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