Technical requirements for fire line connections

(1) The fire hydrant water supply system pipe should not be welded when the inner and outer wall hot dip galvanized steel pipe is used. When the inner wall of the system pipeline is not anticorrosive, the connection can be welded, but the welding of the pipeline should meet the relevant requirements. The sprinkler system's pipes (after the alarm valve) should not be welded but should be threaded, grooved, or flanged.

(2) Galvanized steel pipes with a pipe diameter >100mm for the fire hydrant water supply system shall be connected with flanges or trenches. If the pipe diameter of the automatic sprinkler system is larger than 100mm, the thread connection cannot be used. It is only required that the pipe segment with a pipe diameter ≥100mm should be equipped with a flange connection or groove connection point at a certain distance.

(3) Threaded flanges are recommended when the pipes of the hydrant water supply system and the automatic sprinkler system are connected by flanges, and secondary galvanizing is required when welding flanges are used.

(4) When the diameter of any pipe segment needs to be changed, reduced pipe joints and fittings in accordance with the standard shall be used.

(5) For the connection mode of fire fighting pipes and related technical requirements, please refer to the relevant provisions in "Technical Measures for Design of Civil Building Engineering - Water Supply and Drainage".

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