Regarding the feed pump and compressor size reduction experiment,
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It is understandable that the auxiliary oil pump will drop slightly when it starts up, and the compressor will drop slightly when it stops when it drops big. Cut out the hand valve of the backup pump pressure gauge, and quickly release the pressure to 0.25Mpa. The backup pump self-starts and the big drop motor test position. There are three gauges AA, AB, AC in the main pipe pressure gauge at the outlet of the oil station. Why do you have to cut out the hand valve, and then take two out of three? The point is, why do you need to cut out all three gauges? thank you all
Your language is too technical, so I didn’t understand clearly. I’m just guessing the answer, for reference only. You may mean the problem of hydraulic interlocking. If you want to verify whether the interlocking instrument and control system is easy to use before the equipment is tested or started, you need to do an "airdrop test". Hydraulic interlocking is one of the items of the airdrop test. When the process requires artificially lowering the oil pressure to a certain set value, the auxiliary oil pump starts, and when it drops to the shutdown interlock value, it automatically cuts off the power (trips). During this period, it is necessary to match the setting position of the interlock switch. The instrument and electrical interlock settings of each equipment need to be different. There is a three-pin pressure gauge with a contact switch. Is it possible to close the pressure gauge valve to reduce the pressure and trigger the switch artificially? I don’t know if this explanation is correct. It is for reference only.
Hello, master, I didn’t explain it clearly. They are three separate pressure remote transmission meters. They are located at the main outlet of the new hydrogen oil station.
It is best to understand the process principles and the instructions for the pressure gauge. Such a simple retelling may be too professional and difficult to participate in, for reference only.
I haven't been to the scene to see it, so I don't know where the oil pressure sides of these three main pipes are connected. I'm guessing.: These three gauges are all in the oil pump outlet main pipe, which means that the pressures of these three gauges are all the oil pump outlet main pipe oil pressure. A large drop means that the oil pump outlet main pipe oil pressure is reduced to the minimum. If the pressure of one gauge does not drop to the minimum, it means that the main pipe oil pressure is not low, so all three meters have to be cut out. For reference only
According to their interlocking design, it is also a two-out-of-three setting. Even if one of them does not reach the interlocking value, the interlocking should still act! We generally do not cut off these three remote instruments here. During the test, the pump is manually stopped and the backup pump is left manually without starting, in order to simulate the most realistic state to test the reliability of the interlock. Moreover, for this two-out-of-three test points, after the above test is normal, analog signals will be used to test one by one in combination, which also avoids errors in interlocking relationships.