dcasto:
What we did in that situation is put in a bypass around the analyzer, set to operate after the process has shutdown. The procedure is to use a Draeger to sample the gas and once the content was lower than the bypass trip point, then the analyzer could be brought back online.
This...
jsummerfield:
There are many manufacturers that make a transmitter to meet a SIL 2 application (most state: in a simplex configuration) and a SIL 3 application in a redundant configuration.
sdl
Rafcu:
Ashereng is correct. Your client will loose availability (i.e. increased nuisance trip rate). You will have to do calculations to determine if the PFD is adequate as well as if the MTTFS will meet their standards/requirements.
I don't see this as a huge dilemma. Do the calculations...
invaluable:
I know your exact situation very well. A couple of questions for you:
Do you have control over the third party separator? If so, then it is simple, shut them in on high level. I am also assuming that you are the processor, so you should have an agreement in place to have them...
Invaluable:
This is a tough one. It almost sounds like the meter is at the wrong place. Water will accumulate at the plate and will always create problems with the metering. Is it possible to move the meter downstream after the liquids are separated?
If this is not possible, then there are...
RobV:
Not all failures are reported back to the manufacturer and this can lead to optimistic assumptions. The best failure data is one from an operator who has logged the failures, maintenance, etc. that can be accumulated and compiled. In all cases, the more conservative approach is best...
southerton:
There are many sources of failure data. The manufacturers are one source. I would recommend Faradip as that is a good source. Others include OREDA, exida, AIChE.
I have evaluated many different SIL calculation packages and have decided that it is best to go with any package with...
