Emergency relief valve opens for no reason
Thread Content
A company was in the oil inlet stage and was about to produce a product. At first, the device ran smoothly, but suddenly the emergency relief valve opened and could not be closed in the central control room. Therefore, the system pressure accumulated and dropped, causing the high-point liquid level to surge. The DCS control valve from high-to-low points could not be opened, so the external operator had to manually close the valve. However, because the four emergency pressure relief valves of two devices were opened at the same time and the pressure relief speed was too fast, and only one of the ground incinerators was put into use, its compliance was too great, so that fire trucks came to protect other equipment from damage! ~I would like to ask whether the sudden emergency pressure relief had a great impact on the catalyst because the emergency pressure relief valve could not be closed and the pressure was relieved from 16.5MPa in ten minutes! What are the chances of catalyst damage? I feel like the catalyst must have been shattered quite a bit. Looking forward to the experts! ~ This post was last edited by hgkklzp on 2009-3-11 23:00 ]
Do you have to let the outside operator close the valve manually? I don’t understand.
Cause of accident when emergency pressure relief valve opens for no reason: ⒈If there is a problem with the instrument, please find instrument maintenance personnel to check and deal with it. ⒉The operator made a mistake and should be careful afterwards.
I think there is something wrong with the instrument. The interlock setting may be wrong. Please check it carefully. It's best to come here and tell everyone after you find out the reason. :)
The cause should be carefully searched. Personally, I think it is not a problem with the instrument, but may be caused by incorrect chain settings. Looking forward to the results!
The main reason is that the results of this meeting have not come out yet! But it's not the instrument's fault, because we tried other valves that worked! The chain is even worse because it is the second start of construction and no one has touched the chain setting value.
Did the pressure relief valve open accidentally? There is something wrong with the instrument part, such as the wind is gone or the purification air pipeline is blocked. If all the relief valves are open, it is probably a problem with the interlock unit.
The pressure relief valve should normally open due to an accident, so it is most likely caused by instrumentation or interlocking. There are many reasons for the instrument, maybe communication signal interruption, controller failure, purification air pressure is too low, etc. This post was last edited by lyybjgz on 2009-3-13 15:40 ]
Check whether there is water in the on-site valve positioner junction box, causing a short circuit and causing the valve to open.
If the pressure is relieved after 10 minutes, the damage to the catalyst will definitely have an impact. It depends on the pressure drop after starting the operation.
This is a big deal! ! ! ! ! If the suspected cause can be eliminated, then look for the manufacturer! ! ! ! ! It's over when someone dies.
Pressure relief is generally nothing to worry about. The design considers the pressure relief of the device. There should be a pressure relief test before starting work for the first time. It should be noted that when relieving pressure, the external operator should pay attention to inspect some flanges with high temperature and high pressure, such as high-replacement flanges. If these places change quickly, they are prone to leakage. We have had this happen several times. Pressure relief has little effect on the catalyst, so don't worry too much. As long as the gas phase is not reversed, it will damage the catalyst. Of course, the less stress relief the better, after all, it is easy to cause some accidents.
It is a safety valve that opens when the pressure is not specified. The main reasons are (1) The spring adjustment pressure of the spring-type safety valve is insufficient, the spring fails or the elastic force is insufficient. The safety valve should be readjusted or replaced. ； (2) The weight of the lever safety valve moves forward. The weight should be moved to the original constant pressure position and tightened with the limit screw. Can refer to: http://bbs.hcbbs.com/thread-221409-1-2.html
It should be a gas line or circuit problem with the pressure relief valve. This problem sometimes occurs. The 2.1MPA/MIN pressure relief will have an impact on the catalyst, but it is within the allowable range. No matter how many pressure relief valves you open, there should be a flow-limiting orifice plate behind it, and the amount is certain.
The last time we released the pressure was due to bad weather, water entered the valve positioner junction box on site, causing a short circuit. The valve was opened but the control was normal. It was really scary.
There are many reasons for interlocking. Although your settings are fine, some related things can also cause interlocking, such as communication signal interruption, controller failure, low purification air pressure, etc. You should check it carefully. I don’t know what kind of device you have, and whether there are many types of catalysts in the reactor. Emergency pressure relief may cause chaos in the catalyst bed, and the possibility of catalyst crushing is not very high. Emergency pressure relief has a certain impact on your reactor.