Why is it necessary to stop leaking air or steam when the pressure in the synthesis tower drops to 1.5 Mpa?
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Why is it necessary to stop checking for air or steam leaks when the pressure in the urea synthesis tower drops to 1.5 Mpa?
We don’t have any relevant regulations here; you’re from that factory
Is it a short stop? What process? All I know is that in the full-circulation aqueous solution method, when the pressure drops to 8.0 Mpa, steam for leak detection must be stopped to prevent damage to the lining due to stress. When the pressure in the urea synthesis tower drops to 1.5 Mpa, it is necessary to stop and check what process is being used to prevent air or steam from leaking in.
Agree with the view from the 2nd floor – to prevent damage caused by stresses on the lining, such as bulging. According to GB150, the allowable external pressure for the lining is generally around 0.2 MPa. Of course, its safety factor is still very high. Stricter controls mean greater safety.
Regarding the issue mentioned by the original poster, it generally occurs during long-term parking. According to the long-term parking procedures, air or steam used for leak detection is generally stopped when the pressure in the urine tower drops to 8.0 MPa. Since air or steam used for leak detection (nitrogen can also be used) is filled between the lining and the outer shell of the urine tower, during the pressure relief process of the tower, if the use of this leak detection air or steam is stopped too late, and the gas pressure between the lining and the outer shell becomes greater than the pressure inside the tower, it is possible for the lining to be crushed. Therefore, during long-term parking, it is essential to strictly follow the operating procedures and promptly shut off the air or steam used for leak detection.
Whether it is a long pause or a short one, whenever the pressure in the synthesis tower drops to 8.0 MPa, it is necessary to stop and check for leaks using steam or air; this is done primarily to protect the synthesis tower, as mentioned by the original poster, in order to prevent damage to it.
Since leak detection steam or air is introduced between the shell and the lining of the synthesis tower, similar to jacketed equipment, it is necessary to ensure that the internal pressure is higher than the external pressure in order to prevent the lining from being compressed. Its pressure is generally 0.8 MPa; therefore, when the plant is shut down and the pressure in the synthesis tower drops to 1.5 MPa, it is necessary to stop the steam or air used for leak detection, primarily to protect the synthesis tower.
The urine tower is lined with loose lining to ensure unobstructed leak detection channels. The leak detection medium is stopped after the pressure in the synthesis tower has been reduced to a certain level, in order to prevent the lining from bulging inward under pressure and getting damaged.
Yours is terrible; fix it quickly. Safety in production is of utmost importance. This post was last edited by 1025199692 on 2009-3-8 at 13:30.]
The short-stop synthesis tower maintains pressure; there’s no need to shut it down, right?