Основы эксплуатации систем теплоснабжения. Испытание, промывка и пуск теплосетей

Strength and tightness tests .

There are 2 types of tests:

1. Hydraulic .

2. Pneumatic . It is checked at t n <0 and the impossibility of heating water and in its absence.

Hydraulic tests.

Hydraulic tests.

• Instruments: 2 pressure gauges (working and control) class higher than 1.5%, pressure gauge diameter not lower than 160 mm, scale 4/3 of the test pressure.

Order of conduct:

1. Disconnect the test area with plugs. Replace the stuffing box expansion joints with plugs or inserts. Open all bypass lines and valves unless they can be replaced with plugs.

2. The test pressure is set = 1.25 P slave , but not more than the working pressure of the pipeline P y . Exposure 10 minutes.

3. The pressure is reduced to working pressure, and inspection is carried out at this pressure. Leaks are monitored by: pressure drop on the pressure gauge, obvious leaks, characteristic noise, fogging of the pipe. At the same time, the position of the pipelines on the supports is monitored.

Pneumatic tests are prohibited for: Overhead pipelines; When combined with other communications.

Pneumatic tests are prohibited for: Overhead pipelines; When combined with other communications.

• During testing, it is prohibited to test cast iron fittings. It is allowed to test fittings made of ductile cast iron at low pressures.
• Instruments: 2 pressure gauges, pressure source – compressor.

1. Filling at a rate of 0.3 MPa/hour.

2. Visual inspection at pressure P ≤ 0.3P tested. , but not more than 0.3 MPa. R isp = 1.25 R slave .

3.The pressure rises to P tested , but not more than 0.3 MPa. Exposure 30 min.

4. Reduce pressure to P slave , inspection. Leaks are determined by the following signs: a decrease in pressure on pressure gauges, noise, bubbling of a soap solution.

Safety precautions:

• during the inspection it is prohibited to go down into the trench;
• Do not get exposed to air flow.