Regarding the setting pressure of the safety valve in the ammonia separator of the gas circuit system of centrifugal ammonia compressors
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In the gas circuit system of the centrifugal ammonia compressor, the safety valve of the ammonia separator has a certain set pressure. In the process flowing through the ammonia compressor, the gas first enters the ammonia separator, then passes through the ultrafilter, and subsequently reaches the inlet of the ammonia compressor. The outlet of the ammonia compressor has two branches: one branch sends the gas directly to the outside, while the other branch sends the gas to the gas cooler, from where it returns to the ammonia separator. Our inlet pressure is 0.25, and the outlet pressure is 0.7. The set pressure for the safety valve of the ammonia separator is 2.1 MPa. One of my supervisors says that this value is intended to protect the ammonia separator tank, but another supervisor suggests that 0.3 MPa would be better, as it would help protect the ammonia compressor by preventing excessive inlet pressure. So, which value is better: 2.1 or 0.3? ? ?
This is from Kellogg; the inlet pressure is around 0.02, the outlet pressure is around 1.5, and the relief valve operates at a pressure of 1.88
I agree with the opinion above; safety valves are considered special equipment, and the sealing pressure as well as the set pressure must be determined in strict accordance with regulations. You can’t just obey whatever a leader says; otherwise, serious problems will arise.
I have seen that safety valve, and I know your boss as well. Your old boss is way too slow.
Agree with the previous comment; it’s necessary to follow the procedures – safety first
The safety valve of the ammonia separator is primarily determined by the saturated vapor pressure of ammonia under high-temperature conditions, along with a safety factor; it’s not decided by any individual in authority
2.1 is intended for protecting the separator, as both the pipeline and the separator are designed for a pressure of around 2.2. 0.3 is what truly protects the compressor. It will be clear which one to use.
The pressure setting for the safety valve on the ammonia compressor inlet separator cannot be set at 1.1 or 1.2 times the operating pressure, because the saturated vapor pressure of ammonia is very high when the system is shut down. If the setting for the safety valve on the inlet separator is set at 1.1 or 1.2 times the operating pressure, this valve will activate as soon as the system is shut down, and it will also activate when the system is started up. This safety valve design takes into account what was discussed with your supervisor.
The setting pressure of the safety valve is determined based on the equipment being used and the design pressure of the industrial pipelines; its purpose is also to ensure the safe operation of such equipment and pipelines.