Can the outlet pipeline of the safety valve be combined?
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Can the outlet pipelines of the safety valve be merged into one and then vented? What should be paid attention to if they are merged into one?
Yes, as long as the back pressure factor is taken into consideration, the selection of pipe diameter should not affect the discharge capacity of any valve.
Do I need to add a check valve to the outlet of each safety valve? Some people suggest that a check valve should be added to the outlet of each safety valve so that it does not backflush after being combined.
Will adding a check valve affect the discharge of the safety valve? We do not add a check valve to the confluence.
Absolutely, the outlet of the combustible gas safety valve in each factory is collected into the flare is a good example. However, back pressure factors must be fully considered during design.
When there is a low pressure vent line, it is best to add a check valve.
Absolutely. In fact, the safety valve venting of many devices is designed in this way, because as long as the pressure for safe venting and pressure relief is very low, there is no possibility of backlash.
Try not to do this as much as possible. In fact, the safety valve vents of many devices are collected into a buffer tank. This design prevents the possibility of pressure backlash and the possibility of carrying liquid during the safety vent pressure relief.
Okay, this is how the ammonia compression section works.
The safety valve outlets of combustible gases and hazardous media are all collected into the flare line, so collection is feasible.
After listening to what everyone said, it seems more reasonable not to add it, but it seems to be okay to add it.； I don’t know if there are any relevant standards to prove it. The main issue is the venting of the compressor. The venting medium is natural gas. There is no possibility of entrained liquid and no possibility of reaction. It seems that not adding it is a better choice.
Select the back pressure and add a check valve according to the specific situation. Most do not need to add a check valve. Safety valves for each unit are integrated into the flare line. However, an isolation valve must be added to each safety valve outlet.
Yes, it must be considered that the total cross-sectional area cannot be less than the sum of the cross-sectional areas of each branch pipe and the back pressure requirements.