The pipes for the fire hydrant system shall be selected according to the design requirements. Generally, galvanized carbon steel pipes and pipe fittings shall be used. The inside and outside of the pipe wall shall be galvanized evenly, without rust and flash, and the parts shall be free of bias, square thread, incomplete screw thread, inaccurate angle, etc. The specifications and models of alarm valve, action valve, control valve, retarder, water flow indicator, pump adapter and other main components of the fire sprinkler system shall meet the design requirements