How to determine when a safety valve opens and closes. Urgent! Urgent! Urgent! !
Thread Content
How to determine the operation of a safety valve when it opens and closes in a professional manner
This post was last edited by Refiner on 2019-12-15 08:31. An external leak from the safety valve is usually visible to the eye; in case of an internal leak or malfunction, one can check whether there is flow or temperature at the outlet. In most cases, this method can be used for inspection. It turns out that when performing regular inspections on the safety valves in our equipment, we cut off the low-pressure vent line and the bus connection, then check whether the pressure rises. If the pressure does increase, we proceed to identify which safety valve is leaking.
When the pressure in a container rises above its limit and then drops sharply without any corrective actions being taken, it is usually because the safety valve has activated. After activation, the pressure drops rapidly before returning to normal levels; at the same time, the pressure in the vent line increases. If the gas is discharged into a flare, the flare will burn intensely.
If it is emptied directly, there will be a fairly noticeable sound at the site; if it is sealed, some sound should still be produced as well! For internal operation, relevant alarms will be triggered, and the pressure will remain within the controlled range after returning to its normal position.
I agree with the view from the second floor; our workshop also uses this method. Regular monthly checks are conducted on the increase in pressure in the low-voltage areas of the workshop, in order to determine whether there is any internal leakage in the safety valves or pressure relief valves. To determine whether to return the seat in place, one can check whether the pressure in the container can be maintained, or listen for sounds at the site; when there is an internal leak, the safety valve makes a loud noise. If the amount of leakage is small, one can check whether there is a difference in temperature before and after the safety valve by feeling it with their hand; a thermometer can also be used to detect temperature changes. Regular inspections are very important.
Is there any sound from the area behind the safety valve? Is there any temperature in that area? After the main control value starts to decline, does it stop abruptly? If not, it seems that the safety valve has not returned to its original position
1. After the safety valve activates, there will be a sound indicating pressure release; if the medium is safe, one can check whether fluid is coming out of the pressure release port. Also, when pressure is released, the pressure gauge will drop. 2. After returning the seat in place, check whether the pressure gauge remains stable and whether there is any leakage of fluid from the pressure relief hole
We generally rely on sound to determine that the pressure is medium