1) Water meters should be installed in places that are easy to repair and read, free from sun exposure, freezing, pollution and mechanical damage;
2) The front end of the screw-wing water meter should have a straight pipe with nominal diameter of 8-10 times that of the water meter. For other types of water meters, there should be a straight pipe with diameter less than 300 mm before and after the water meter.
3) Rotor type water meter and vertical screw type water meter should be installed horizontally; horizontal screw type water meter and volumetric type water meter can be installed horizontally, inclined or vertically according to the actual situation; when installed vertically, the flow direction must be from bottom to top;
4) For the water supply system which integrates life, production and fire fighting, if there is only one inlet pipe, the bypass pipe should be installed around the water meter.
5) Maintenance valves shall be installed on the front and back of water meters and bypass pipes, and drainage devices shall be installed on water meters and back valves. In order to reduce head loss and ensure the straight flow of water in the pipe in front of the meter, gate valves should be used in front of the meter for maintenance. The household water meter in the residence can not be used as a back repair valve or a special drainage device.
6) Watermeter wells should be protected from flooding and rainwater.