HOW TO CONDUCT PNEUMATIC TEST OF THERMOPACK BOILER/HEATER
Today we discussed about very important topic which is related to thermopack boiler which is how do conduct pneumatic test for thermopack boiler/heaters? Thermopack boiler/ heaters are widely used in process plant now these days because of their great advantage like its operation is very easy and they used very small space in the industries and also their maintenance cost is very low as compared to other large unit boiler etc. Pneumatic test of thermopack heater is very important after the commissioning or any other maintenance job carried out on it. In this article we know about the importance of pneumatic test? & how it conducted on site? what the precaution taken during conducting pneumatic test of heater . Let’s know about the pneumatic test of thermopack heaters.
How to Carry out the pneumatic test of thermopack heaters? following procedure could be adopted for it .
- Blank out suction and outlet points of the circulation pump.
2. Isolation combined expansion cum deaerator tank by blanking inlet and outlet flanges. It is emphasised here that expansion-cum- deaerator tank is not to be subjected to pneumatic test.
3. Blackout thermopack inlets and outlets so that the coil is isolated.
4. Close all vent and drain valves.
5. Check all the flanged joints for ring gasket and clamp the flanges tightly.
6. After checking above points connect compressor to one of the drain or vent valve with a flexible air hose and switch it on.
7. Pressure will build in the system, the same can be observed at separate pressure gauge installed in the line.
8. In case the pressure fails to build up , check possible leakage points such as flanges , vent valves and gland packing of the valve etc. Which are the points for major leakage?
9. Once these are found to be correct, and yet the pressure fails to build up then one should look out for a major leakage.
10. If observed minutely, the source of leakage can be determined easily by a hissing sound of escaped air.
11. The source of leakage should be repaired after the system is depressurized.
12. Once again pressuring the system and minor leakages can be determined with the help of soap solution test.
13. Apply soap solution to all the bends and joints (welded, flanged or screwed). Bubbles will be observed at the source of air leakages, however small the leak may be.
14. Maintain the air pressure in the system for atlest one hour with compressor switched off and the air inlet valve closed. The test pressure can be between 5 to 6 kg/cm2g.
15.The pressure drop after one hour should not exceed 10% of the set pressure.10 % of air pressure drop will be due to some leakage in glands of the valves, otherwise even this pressure drop will not occur in case glands are leak proof.
16. Once satisfied with the pneumatic test, the blanked out points should be removed and ring gasket fitted in the flange joints. Now the system is ready to filling.
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