The new hydrogen compressor has been switched in, but what should be done if there is internal leakage in the outlet check valve?
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For a reciprocating compressor with primary compression, there is internal leakage in the outlet check valve of the operating compressor. Now it is necessary to switch to another compressor; assuming that the outlet check valve of the standby compressor has no internal leakage, what impact will significant internal leakage in the outlet check valve of the original operating compressor have on the flow rates at the inlet and outlet during this switch? How can the operations be optimized? Please ask an expert to help answer
Thank you for the answer. If the standby unit operates at 25% load and the operating unit is reduced to 75% load, what could cause the outlet flow to decrease suddenly (with no tendency to recover)?
1. There is a problem with the unloader; it isn’t under load. 2. One of the air valves in the two units is leaking. 3. Leakage from the check valve is inevitable.
There should be no problems with the cutting machine; just be careful when making the switch yourself. After the switch, air might leak into the backup unit, and the air valve may also leak slightly when it’s cold. To address this, close the outlet valve and inspect the check valve
Before the standby unit is brought online, internal leakage can cause a decrease in the amount of gas; the return line of the operating unit can be adjusted to maintain the level of fresh hydrogen and thus ensure system pressure. Once the standby unit is operational, the gas valve will do its job, and its closure can also serve as a check valve function. It is recommended to check the check valves when possible.
From my experience, even check valves can leak. As for switching, it depends on whether the system needs to operate continuously or if it’s possible to shut down one unit and start another
We have this situation as well; we have three levels: 0, 50, and 100. Let’s get to the point. I won’t go into details about things that are prone to problems, such as water, electricity, and oil. 1. Before starting up, follow the proper procedures: rotate the pump shaft first, and replace the air with nitrogen for about 5 minutes. Then the process gas is used for purging, with slight excess purging at the inlet. 2. Test operate the unloader to determine the operating signals and the proper travel position. 3. Stop the replacement process, reset to 0 load and start the machine; close the vent and open the outlet, then slowly increase the pressure in the machine to ≥1.8 MPa. 4. Adjust the load synchronously: after the machine is running at 0 load, close the inlet and outlet and then shut down the machine to release pressure.
I’ve encountered this situation: synchronous switching is very difficult, and there are large fluctuations in outbound traffic; it’s especially hard to switch off the system under high pressure! When the standby unit is pressurized, the outlet pressure exceeds that of the main unit, causing pressure to flow back into the inlet buffer via the cross-line connection of the currently operating unit! It could even cause the overpressure safety valve to activate!
It’s mainly a safety issue; as mentioned above, excessive leakage can cause the safety valve to activate easily.
Observe the flow meter or the visual rod of the unloader