Water tank accessories

(1) inlet pipe: water inlet pipe generally access from the side wall, you can also access from the bottom or top. When the water tank using water pressure network, the outlet should be set at the ball valve or hydraulic valve. Float valve generally not less than 2. Float valve diameter and inlet diameter of the same, each float valve should be equipped with overhaul valve. (2) outlet pipe: outlet pipe from the tank side or bottom access. The top of the outlet pipe from the side wall or from the bottom of the outlet shall be 50 mm above the tank bottom. Outlets should be set gate valve. The inlet and outlet of the water tank should be set separately. When the inlet and outlet pipes are the same pipe, a check valve should be installed on the outlet pipe. When the need to install check valve, should take less resistance Swing check valve instead of lift check valve, and the level should be lower than the minimum water tank above 1m. Life and fire with a water tank, the fire outlet pipe check valve should be lower than the life of the siphon pipe top (below the top of the pipe, the life of the siphon vacuum is destroyed, only to ensure that the water outlet pipe fire) at least 2m, make it have a certain pressure to promote the check valve. When a fire breaks out, the amount of fire-fighting reserves can really work. (3) overflow pipe: tank overflow pipe can be taken out from the side wall or the bottom of its diameter according to the maximum flow of discharge tank to determine, and should be larger than the inlet pipe l2. Do not install valves on the overflow pipe. The overflow pipe shall not be directly connected with the drainage system. Indirect drainage shall be adopted. The overflow pipe shall be provided with measures to prevent the entry of dust, insects, mosquitoes and flies, such as the installation of water seals and filters. (4) Drain pipe: The tank drain pipe should be taken out from the bottom of the bottom. Drain pipe Fig. 2-2n The fire protection and life table is equipped with a gate valve (should not install a cut-off valve) on the water tank, which can be connected with the overflow pipe but not directly with the drainage system. Drain pipe diameter in the absence of special requirements, the diameter generally used DN50. (5) Ventilation pipe: The water tank for domestic drinking water shall be provided with a sealed box cover, and access holes and ventilation pipes shall be provided on the box cover. Exhaust pipe can be extended to indoor or outdoor, but not to reach the place of harmful gases, the nozzle should be to prevent dust, insects and mosquitoes to enter the filter, the nozzle should normally be set down. Ventilation pipes shall not be fitted with valves, water seals and other devices that prevent ventilation. Flue must not be connected to drainage system and air duct. The general use of snorkel DN50 diameter. (6) level gauge: generally should be installed on the tank wall glass level gauge for local indication of water level. When a level gauge is not enough, two or more level gauges can be installed up and down. The overlap between two adjacent level gauges should not be less than 70 mm, see Figure 2-22. If the tank is not installed in the liquid level signal timing, signal pipe can be set to give overflow signal. The signal pipe is usually taken from the side wall of the tank, and its height should be set so that the inner bottom of the pipe is flush with the overflow pipe bottom or the mouth of the bell mouth. Diameter DNl5 commonly used signal pipe can be connected to the often on duty room washbasin, sink and other places. If the tank level and the pump chain, the tank wall or roof mounted on the level relay or annunciator, commonly used level relay or annunciator float, rod, capacitor and float level and so on. Water pressure pump inlet and outlet levels should be considered to maintain a certain safety volume, stop pump instantaneous maximum electrical control water level should be lower than the overflow level of 100 mm, and open the pump instantaneous minimum electrical control level should be higher than the design The lowest water level 20mm, in order to avoid due to the error caused by overflow or vent. (7) tank cover, inside and outside the ladder