Compressor interlock issue
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The interlock system for starting the compressor includes a requirement for shaft rotation; when the compressor stops suddenly, the shaft rotation signal should theoretically turn green before the compressor can be started. Under what conditions can the compressor be restarted without performing shaft rotation? ?
Firstly, the compressor’s cranking interlock is not a mandatory interlock; it is merely an interlock that indicates the position of the cranking device. The compressor can be started as long as the gear position indicator shows that the cranking device is not connected to the compressor. Its function is to prevent the compressor from starting without stopping the cranker and disconnecting it from the compressor, thereby avoiding damage to the cranker and the main motor of the compressor. In other words, even during startup when there is no disk rotation, the indicator for this interlock remains green. So, regarding the question posed by the original poster about under what circumstances it is possible to skip the shaft rotation process, in terms of equipment maintenance, there are no exceptions – shaft rotation should always be performed, as it is an essential step for starting up equipment. In the field of process engineering, there can be exceptions; for example, after a recycle hydrogen compressor fails, the temperature of the reactor bed rises rapidly. If it is not possible to restore the supply of cold hydrogen in a short time, this can lead to excessive temperature rise and pressure release. Under such circumstances, some managers who are willing to take responsibility will order the machine to be started directly, skipping the barring process to avoid an unnecessary shutdown for pressure release.
As long as the cranking mechanism of the cranker is disengaged, it is possible to directly reset the startup interlock and then start the machine right away
Reply and take a look**, learn *a bit!
When the turning hook is disengaged, this condition for starting the machine is met. Turning the shaft before starting up the machine prevents damage to the compressor; you can do this even in a hurry – just turn it a few times. Otherwise, if the vehicle cannot be started, forcing it to operate will result in significant damage~~~~
During the startup process, the ITCC contains only the interlock conditions for starting the compressor; startup is permitted only when the display signal from the gear turner is normal, and it is not necessary to have the gear turner in operation – the two are not related to each other. Whether the signal is normal or not determines whether the gears of the gear turner and those of the compressor are disengaged, and this must be confirmed before starting the compressor. Weekly Case Studies of 2017, Summary Post on Guessing Devices: http://bbs.hcbbs.com/thread-1740967-1-1.html (Source: Haichuan Network)
What the expert on the second floor said is absolutely correct; I fully agree.
Yes, it depends on the actual situation. Especially when there is a large amount of venting, reducing the compressor startup time can help shorten the duration of venting. However, this depends on what the manager decides to do; those who are willing to take responsibility will start the compressor right away, while those who are not will follow the established procedures!
For safety reasons, it’s better to turn the compressor shaft as required. We have a Shaanxi Guoji centrifugal compressor here that automatically disengages when started up, so it’s not that complicated. If problems arise in the compressor due to failure to turn its shaft, the losses will be significant.