Основы эксплуатации систем теплоснабжения. Испытание, промывка и пуск теплосетей

Pneumatic testing is performed at low outside temperatures and in coordination with heating networks.

• Pneumatic testing is performed at low outside temperatures and in coordination with heating networks.

Pneumatic tests are carried out in the following order:

• - clean and blow through the heat pipe;
• - install pressure gauges and plugs;
• - fill the pipeline with air at a given pressure;
• - inspect the pipeline, lubricating the joints with a soap solution;
• - satisfy the detected defects;
• - test the pipeline a second time;
• - disconnect the compressor and bleed air;
• - remove plugs and pressure gauges.

The value of test pressure for the pneumatic testing method is established in accordance with temporary instructions SN 298 - 85.

• The value of test pressure for the pneumatic testing method is established in accordance with temporary instructions SN 298 - 85.
• Tests are carried out in sections approximately 1 km long.
• leaks are determined by soap bubbles, the sound of escaping air and smell when adding odorants (ammonia, ethyl mercaptan ).
• The duration of the test and the magnitude of the pressure drop are determined depending on the diameter. For example, for a pipeline with a diameter of 400 mm, the test time is 2 hours, the permissible pressure drop is 450 Pa .

After the final pressure testing of the heating network to remove contaminants from the pipelines in the form of sand, soil scale, scraps of metal, etc., the heating networks are flushed. Flushing can be carried out either throughout the entire network or in sectional sections.

• After the final pressure testing of the heating network to remove contaminants from the pipelines in the form of sand, soil scale, scraps of metal, etc., the heating networks are flushed. Flushing can be carried out either throughout the entire network or in sectional sections.

Hydraulic flushing

• Hydraulic flushing is carried out with tap water by connecting a water supply with a pressure of 0.3 - 0.4 MPa . Water is discharged through drains. Secondary flushing is carried out after filling the pipeline with increased pressure and circulation from network pumps protected by mud traps