According to the national standard "Technical Specification for Heating Metering" JJ173-2009:

3.0.6 The design, installation and debugging of the heat meter shall meet the following requirements.

1, the heat meter shall be selected according to the nominal flow rate, and the pressure drop under the design flow rate shall be checked. The rated flow can be determined according to 80% of the design flow.

2. The installation position of the flow sensor of the heat meter shall meet the instrument installation requirements and shall be installed on the return pipe.

3. The installation position of the heat meter should ensure the normal working requirements of the instrument, and should not be installed in a position that hinders maintenance and is vulnerable to mechanical damage, corrosion and vibration. Before installing the instrument, the inside of the pipeline should be cleaned.

Extended data:

Installation requirements of heat meter:

1, new buildings with central heating and energy-saving renovation of existing buildings must be equipped with heat metering devices.

2. The heat settlement point of the central heating system must be equipped with a heat meter.

3. The heat meter located at the heat settlement point shall be verified according to the provisions of the Metrology Law of People's Republic of China (PRC) and the National Metrology Law.

4, the existing civil building heating system of heat metering and energy-saving technical transformation should ensure the indoor thermal comfort requirements.

5. Energy-saving technologies such as outdoor pipe network hydraulic balance, heat source climate compensation and optimized operation should be given priority in the energy-saving transformation of existing central heating system, and the effect of energy-saving transformation should be evaluated and tracked through heat meter.

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