sheiko
Chemical
- May 7, 2007
- 422
Hello everyone
I was wondering if there is any standard or recommended practice regarding typical alarms and trips to be implemented around centrifugal pumps?
The reason is: in the refinery I am working in, I see plenty of alarms and trips that I don't see the purpose.
For exemple, on pumps (canned motor pumps coming with their own winding TSHH) discharging LPG from debutanisers (gasoline HDT and catalytic reformer) to deethaniser, we can see:
ALARMS:
- PDAH on suction filters (OK)
- PAL on suction (OK)
- TAH on suction (redundant with PAL on suction?)
- FAL in discharge (OK)
- PAL on discharge (why?)
TRIPS:
- LSLL on suction drums (OK)
- PSLL on suction (OK)
- TSHH on suction (redundant with PSLL?)
- PSLL on discharge (why?)
- FSHH on discharge (redundant with PSLL on discharge? but maybe a better option?)
On other pumps, I have also seen PDAL and PDSLL (between pump suction flange and suction drum) to trip the pump on low NPSHA (similar to PSLL on suction)...
So could you please let me know your thoughts on that (I have indicated my comments next to the above items)?
I do understand that alarms and trips are selected on a case by case basis, but maybe there is a minimum set to implement, but I don't know where to find this information.
Thanks
@Lionel_Sheiko / geniechimiquefacile.com
I was wondering if there is any standard or recommended practice regarding typical alarms and trips to be implemented around centrifugal pumps?
The reason is: in the refinery I am working in, I see plenty of alarms and trips that I don't see the purpose.
For exemple, on pumps (canned motor pumps coming with their own winding TSHH) discharging LPG from debutanisers (gasoline HDT and catalytic reformer) to deethaniser, we can see:
ALARMS:
- PDAH on suction filters (OK)
- PAL on suction (OK)
- TAH on suction (redundant with PAL on suction?)
- FAL in discharge (OK)
- PAL on discharge (why?)
TRIPS:
- LSLL on suction drums (OK)
- PSLL on suction (OK)
- TSHH on suction (redundant with PSLL?)
- PSLL on discharge (why?)
- FSHH on discharge (redundant with PSLL on discharge? but maybe a better option?)
On other pumps, I have also seen PDAL and PDSLL (between pump suction flange and suction drum) to trip the pump on low NPSHA (similar to PSLL on suction)...
So could you please let me know your thoughts on that (I have indicated my comments next to the above items)?
I do understand that alarms and trips are selected on a case by case basis, but maybe there is a minimum set to implement, but I don't know where to find this information.
Thanks
@Lionel_Sheiko / geniechimiquefacile.com