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In the vast and complex water supply network of a city, water meter boxes play a crucial and indispensable role in ensuring the efficient and stable operation of the water supply system. The installation of water meter boxes is a systematic project governed by strict norms and standards. Each step is crucial for ensuring the safety of the water supply and accurate measurement.
Installation Location
Select a location that is easily accessible for staff to read the water meter, conduct inspections, and perform maintenance, such as in stairwells, pipeline shafts, basements, or designated outdoor water meter wells. Avoid installing it in inaccessible corners or areas that are often obstructed. Install water meter boxes in a dry and well-ventilated place, away from water sources, steam, and humid environments to prevent the water meter box and the water meter inside from getting damp, rusting, or being damaged.
Avoid installing it in places exposed to direct sunlight, high temperatures, or low temperatures. In hot areas, prevent the high temperature inside the box caused by direct sunlight; in cold areas, take insulation measures to prevent the water meter from freezing, such as installing it indoors or in a water meter well with an insulation layer.
Box Body Installation
The water meter box should be installed firmly and steadily, with the bottom closely attached to the ground or the installation foundation, without any shaking or tilting. If it is installed on the wall, use fixing parts such as expansion bolts to firmly fix the box body to ensure that it will not loosen during use.
The installation height of the water meter box should comply with relevant regulations. In residential buildings with pipeline shafts, when the water meter is installed in the pipeline shaft, the installation height of the water meter should be 0.8-1.2 meters above the ground or floor; in buildings without pipeline shafts or commercial stores, when the water meters are centrally installed in an outdoor meter box, the installation height of the water meters in the box should be 0.3-0.5 meters above the ground for easy operation and reading.
The door of the water meter box should open and close easily and must seal tightly when closed to prevent dust and debris from entering. Ideally, the door should open outward, with an opening angle of at least 90 degrees. This design allows staff to read the water meter and perform inspections and maintenance more conveniently.
Connection of Water Meter and Pipelines
The water meter should be installed horizontally, and the direction of the arrow on the meter case should be consistent with the direction of the water flow to ensure accurate measurement.
There should be a certain length of straight pipe before and after the water meter to ensure stable water flow and improve the measurement accuracy. Different types of water meters have different requirements for the length of the straight pipe section. Generally, for winged water meters, there should be a straight pipe section of not less than 5 times the interface diameter before the meter and not less than 2 times the interface diameter after the meter; for nutating disc water meters, there should be a straight pipe section of not less than 8 times the water meter interface diameter between the meter and the valve.
The connection between the water meter and the pipeline should be tight without any water leakage. When using threaded connections, ensure a good fit of the threads and use sealing materials such as hemp yarn and PTFE tape; when using flange connections, ensure that the flange surface is flat and the bolts are tightened with uniform force.
The valve must be installed according to the "valve direction indication", and the axis of the water meter and the valve should be on the same horizontal line for easy inspection, repair, and control of the water flow.
Other Aspects
Before installation, flush the main water pipe to remove debris such as hemp yarn and sand. The pipeline must successfully pass both the pressure test and flushing to prevent debris from entering the water meter box and the water meter. This is essential for ensuring the proper operation and measurement accuracy of the water meter.
If the building is equipped with a fire hydrant system or if interruptions to the water supply are not permissible and there is only one inlet pipe, a bypass pipe with the same diameter as the inlet should be installed. This bypass should remain closed under normal conditions and be sealed with a lead seal.
The support of the straight pipe section connected to the water meter should be firmly fixed. For water meters with a diameter greater than or equal to DN50, independent support should be set up to support the water meter and the pipeline and reduce the stress on the water meter from the pipeline.
By following these installation specifications for water meter boxes, the service life of the equipment can be extended, and the occurrence of failures can be reduced, thus safeguarding the continuous and stable water supply of the city. Therefore, all parties should attach great importance to the installation specifications of water meter boxes and treat every detail with a rigorous attitude, so that the urban water supply system can continuously provide a steady stream of life-giving water for the prosperity and development of the city and the good life of its residents on the cornerstone of standardized installation.
