Regarding the commissioning time of the ESD system
Thread Content
The company is undergoing routine shutdown for maintenance; during the shutdown, certain parameters may trigger ESD, so ESD is switched off in advance. During operation, start up the process and wait until all parameters are normal before activating the ESD. I’m not sure if this approach is correct There shouldn’t be any problem with the timing. But it seems that the safety interlock should be activated before the device is turned on, in order to provide protection. But if ESD is used before turning on the device, it simply won’t start at all! It’s a contradiction. I would like to ask whether there are any national or international standards that address this issue
That means the interlock logic in your ESD is unreasonable.
There is a problem with the ESD design; it seems that the start-up and shutdown states were not taken into account.
Starting and stopping the machine are the most dangerous times, and greater protection against ESD is needed; how can a bypass be used at such times? Is there a problem with the logical design of the ESD?
The process can be started only after the ESD is put into operation
I’ve seen designs where interlocking can only be activated once the system is running properly; for example, if the oil pressure is low or the inlet flow rate is low, how can it be started without engaging the bypass?
I’ve seen designs where interlocking can only be activated once the system is running properly; for example, if the oil pressure is low or the inlet flow rate is low, how can it be started without engaging the bypass?
I also thought it over carefully, and I feel that there is indeed a problem with the design. The main factor preventing startup is the hydrogen pressure; the ESD system has a minimum hydrogen pressure setting, and the nitrogen filling valve opens when the pressure falls below this limit – which is unreasonable! ! Without this interlock, it is still possible to start the machine normally by engaging it before power-up.
Whether it is cost-effective is determined by the manufacturing process; the instruments are modified according to the requirements of that process.
We hadn’t noticed this before; it’s happened both when we uploaded first and then later.