A
Hello everyone,
I've had a question from one of our offshore assets on UV flame detectors.
Inside the turbine compressor enclosure, there are two groups (circuits) of three flame detectors. The first group is in the "engine" enclosure and the second group is pointed at the drive shaft/turbine end. Both groups (6 FDs in total) are in the same fire zone.
The cause and effects and testing procedure state that an executive action will occur if 1 FD from each group (kind of like 2oo6, not sure if this is accurate name) trigger. However, in actuality the system acts as 2oo3 within each group, i.e. if 2 FDs in the engine enclosure trigger then we'll get the executive actions (alarm, co2 release, etc).
My question is, has anyone seen this 2oo6 (I'm calling it this, though it may have a different name) and is this preferable to 2oo3? I can see the logic, you want to verify that there is an actual flame in the compressor (same FZ). But 2oo3, to me, makes more sense, because you don't have to wait until the flame/fire spreads to the other group's detection range. Some reference reading material would also be very appreciated. Thank you.
Assylbek (Instrument Engineer, 1Y experience, Aberdeen, North Sea)
I've had a question from one of our offshore assets on UV flame detectors.
Inside the turbine compressor enclosure, there are two groups (circuits) of three flame detectors. The first group is in the "engine" enclosure and the second group is pointed at the drive shaft/turbine end. Both groups (6 FDs in total) are in the same fire zone.
The cause and effects and testing procedure state that an executive action will occur if 1 FD from each group (kind of like 2oo6, not sure if this is accurate name) trigger. However, in actuality the system acts as 2oo3 within each group, i.e. if 2 FDs in the engine enclosure trigger then we'll get the executive actions (alarm, co2 release, etc).
My question is, has anyone seen this 2oo6 (I'm calling it this, though it may have a different name) and is this preferable to 2oo3? I can see the logic, you want to verify that there is an actual flame in the compressor (same FZ). But 2oo3, to me, makes more sense, because you don't have to wait until the flame/fire spreads to the other group's detection range. Some reference reading material would also be very appreciated. Thank you.
Assylbek (Instrument Engineer, 1Y experience, Aberdeen, North Sea)