Problems with using medium-pressure steam to warm pipes

First, start the drain, then reduce the steam supply slightly, and gradually warm the pipes while increasing pressure.

There are many details to pay attention to when using medium-pressure steam for pipe heating: 1. Confirm that the condensate control valve is closed and the bypass valve of the control valve is closed. 2. Open drain valve 3 to the ground before opening the control valve. Slightly open the medium-pressure steam valve 4 in the boundary area. A large amount of condensate sprays out from the drain port 5. Once all the discharge ports are discharging dry steam, slightly open the control valve of the condensate line and close the discharge valve. 6. Properly opened inlet steam valve

When boosting voltage, care should be taken to avoid liquid hammer. When warming up the pipes for the first time, it is necessary to do so slowly, and monitor the expansion of the pipes by using the supports on them. The drain valves should be left fully open; if they become blocked, they can be tapped with a hammer or stick. If less condensate is being discharged, the pressure can be increased slightly.

This post was last edited by leo_0088 on 2010-10-8 09:25. When warming the pipe, one should not rush; first turn on the backflow valve fully, then slowly open the steam inlet valve (just a little bit, not fully). Once all the water has been drained and only steam is coming out, then gradually increase the opening of the steam valve. Only after steam is flowing should the backflow valve be closed. The entire process must be carried out slowly, making sure that there is no sound of water hammer.

1. Steam supply to the pipes should only be initiated after it has been confirmed that all preparatory work is complete and that the personnel responsible for monitoring the pipes as well as the operators are on site. 2. Open all drain valves on the steam pipeline network to drain the condensed water accumulated in the pipes. 3. Slightly open the steam valve to supply steam, warming the pipes section by section. 4. Check in the direction of steam flow: once steam is detected at one drain point, it can be closed; proceed to the next drain point and close it as well when steam is detected there. Continue this process until steam is seen at the end of the pipeline. Only after steam is present throughout the entire pipeline should the valve for allowing steam to flow be opened fully. 5. Raise the temperature first and then the pressure, with a temperature rise rate of 40°C to 50°C/h. 6. During the pipe warming process, the steam pressure should be increased gradually, at a rate of 0.01 MPa/min; once the pressure reaches 0.6 MPa, the increase rate should be 0.02 MPa/min. 7. When the steam pressure inside the pipe rises to 0.1 MPa, keep the pressure stable and heat the pipe for 30 minutes; if no abnormalities occur, then the pressure can be increased further. 8. The steam pressure inside the pipe was gradually increased to 0.2 MPa, 0.4 MPa, and 0.6 MPa respectively, and the pipe was held at each pressure level for 1 hour to warm it up.