Can high-pressure and low-pressure vent lines share the same vent pipe?
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The operating pressure of the primary separator is 5.7 MPa, while that of the secondary separator is 1.6 MPa. Can the vent lines of these two separators share the same vent pipeline? :If a handshake is not possible, evacuation must be carried out through an empty standpipe – how exactly should this be handled?
I have seen multi-stage reciprocating compressors, where the vent pipes of several intermediate buffer tanks are combined together after they come out
If the vent pressure is lower than the operating pressure of the secondary separator, the same vent pipe can be used.
Venting is generally done through a pressure-controlled valve; regardless of the pressure before the valve, as long as the pressure set after the valve is the same, the venting pipelines can be shared. If the pressures set after the valve differ, then the pipelines cannot be shared. Additionally, in the case of flammable gases, high-pressure venting can usually be directed into the fuel gas network, while low-pressure venting must go into a flare system or a low-pressure recovery system.
If the atmosphere is released directly, I think that’s fine, as the actual pressure after release will be at atmospheric level. If there are valves in between, it’s necessary to pay attention to the pressure rating of the pipes to avoid accidental operations
If the atmosphere is released directly, I think that’s fine, as the actual pressure after release will be at atmospheric level. If there are valves in between, it’s necessary to pay attention to the pressure rating of the pipes to avoid accidental operations
From a security perspective, it is recommended to set them separately so that they do not affect each other.
I think it’s fine; we can use low-pressure pipes for venting. The high-pressure pipeline becomes a low-pressure pipeline through high/low-pressure reducer sleeves, and they can be vented together. That’s how it is in our factory – everything ends up converging at one main pipe. But the prerequisite is that the air release must be the same.
No problem, that’s how hydrocracking works
The vent lines of the two separators can share one vent pipe, but the pipe diameter needs to be calculated.
The two pressures are not very different, so it should be fine. However, attention must be paid to the pipe diameter design at the point where the vent pipes meet, to prevent air leakage or overpressure.