Addressable F&G System at Living Quarters

[hafizeRWP]

Salam,

For addressable F&G system, all the voting shall be done within the addressable system at Living Quarters. However, for executive action i.e. initiate ESD, GPA, start FWP etc, can it be be done at the main F&G system?Mean, we need to run few cables for this hardwired signal between addressable F&G system to main platform F&G system. Is this a normal practice?

[azhar]

Hafize, is this Carigali / SSB project ? Give some background.

[Admin]

Hafize,

You had not responded.

Is this a normal practice? There are many ways to implement. So , normal practice depends who the is the client.

This is my personal thought .

If this is DEP/PTS, DEP 32.30.20.11-Gen.September 2002 ( anyone knows if there is any update?) addressable system is not acceptable. See clause 2.1 . So, if the project team want addressable, they have to raise a deviation request.

You wrote "For addressable F&G system, all the voting shall be done within the addressable system at Living Quarters."

I wonder how you would vote. As far as I'm concern, each "bedroom" will only have one smoke detector. You can not vote with one detector. You may vote for all those room with many detectors, however, most the area are the "bedrooms".

In my opinion , the design concept should be on the basis of providing early warning. The addressable system should be of the type which not only tells you exactly where the location but also provides you with very early warning of imminent fire condition.

With this concept in place, executive logic is not necessary because the operator can quickly intervene to investigate and put off small fire easily using portable extinguisher or override false alarm.

This concept should be acceptable because the LQ is always manned. It would be a very messy to have spurious faults releasing sprinklers and inergen .

With this concept, the effected fire damper can be close immediately so as to prevent air feeding the fire. Assuming that the LQ is inherently safe , there is no harm closing the fire damper automatically on single detection. For those area with more detectors, you can have voting to minimise the spurious closing of the damper.

Fire in LQ should not automatically initiate ESD. The operator to assess and initiate ESD manually.

Electrical power isolation to be manually initiated.

There is no harm starting the FW pump automatically on single detection.

So, I dont see the need to have voting logic in the main F&G PLC.

However, there is another issue to address. There is big argument whether the fire system must be SIL rated. You need to check with your client if they must be SIL rated. If so SIL classification and verification need to be done. My concept above will not meet SIL1 because it depends on human intervention. We can discuss further on this subject.

[hafizeRWP]

This is previous done for Carigali project

[azhar]

Ooooh ! It had already been done. I would not want to comment , nanti orang marah. But if this is a new project I would recommend what I had described above which is simple , safe, cost effective and fit for purpose.

Which project is it ; Kumang ?. Did they performed SIL for LQ. If so, what SIL? and who did the study ..GLM ?

[hafizeRWP]

Yes, this is Kumang project. Not sure if they performed SIL for LQ but Carigalu set SIL 2 for LQ and PRS make the study

FYI, Kumang LQ has 5 floor. Each floor have more than 30 smoke detectors plus H2S and Hydrocarbon gas at HVAC intake.

But if this 'manual concept' acceptable if SIL 2 rated?

[azhar]

As I had indicated in previous reply, human action will not meet the SIL.

LQ is like our office building, hotels etc so the normal NFPA should apply , not SIL...this is my thought lah and I had proposed and accepted to all jobs I was involved.

What is the basis of Carigali fixing to SIL2. Why not SIL3 or SIL1 ?. Masa kita classify SIL kan kita check impact ada ramai orang mati ka ? LQ kan ramai orang boleh mati...so kenapa SIL2 aje? Boleh tak tolong check the basis and advise. I nak faham macam mana dia orang decide.

If it is indeed SIL2, then you have to select a SIL2 addressable system. As far as I know , only only autronica can meet this requirement...SIL2 detectors, SIL2 Eagle Quantum is also SIL2 but not suited for an LQ. Ada ke lain addressable system yang SIL2 ?

If they dont purchase SIL2 certified devices, there must be Hardware fault tolerance of 1 i.e. semua mesti redundant , redundant smoke, loop, controller .

Tapi , there is no reason to do the voting in the main F&G CPU macam you dah tanya.

Which brand did they installed? Autonica ?

Lagi satu..H2S detector. pakai detector apa..electrochemical type ?

Berapa ppm H2S dalam pipe ?