HIPS (High Integrity Protection System)

[norzul]

Hi Guys

Anyone familiar with HIPS (High Integrity Protection System) and would like to share previous experience?

Thanks

norzul

 

[MortenA]

Have looked at the NORSOK process standard:

http://www.standard.no/pronorm-3/data/f/0/01/40/9_10704_0/P-001.pdf

Best regards

Morten

 

[Ashereng]

I don't know about familiar.

I have come across it on ONE project that I have done.

What type of experience?

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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[monaco8774]

HIPS was the old terminology used when using a high pressure trip with sufficient reliability to a vessel that you didnt need full relief capacity of the vessel, it was a reference to wording in API14c. This has largely been developed into using SIL standards to actually work out the consequences of a protection loop failing and then ensuring that your probability of failure on demand was low enough to satisfy the requirements. There is an ISO standard for this but I cant recall the number. API 14c HIPPs concept was originally developed largely to overcome the problem of having to relieve incoming pipelines where full flow relief is largely inpractical, I dont think the latest revision even refers to HIPPS anymore.

The original HIPPS system used field instrumentation to provide the low level of failure on demand. Typically two independent upstream shut down valves actuated by two or three independent high pressure trips.(usually put three only if you wanted very high availability and couldnt shut down for maintenance, some HIPS standards do not allow overides so yo need 2 oo 3 voting.) For this system any one transmitter goes down and you close the valve. Not to be confused with voting systems which are really there to make the likelihood of a faulty instrument tripping production less.

 

[norzul]

We are about to install SSOV in lieu of conventional relief valve. Cna this be considered part of HIPS. Refer the link below.

http://technical2005.blogspot.com/

 

[MortenA]

norzul

The NORSOK definition says:
• The system shall comply with DIN 3381
• It has quick acting valves with a closing time of less than 2 seconds
• It has dedicated instrumentation that is not connected to other instrumenta-tion in a way that reduces the HIPPS
• It has local reset
• It is fail close for any loss of instrument air, hydraulic power, electric power or instrument signals
• Each HIPPS loop within the total HIPPS is independent of all other loops
• The design, installation and operation procedures must be verified by third party verification

Best regards

Morten

 

[Ashereng]

norzul,

The set up in your link is similar to the setup I have seen on my previous project.

In your blog, it seems that the SSOV is a self-contained unit (with it's own sensing lines). I like the fact that there are 2 in series.

In my system, we decided to go with 2 pressure transmitters going to a SIL rated safety system (separate from our DCS) and then to a shut off valve (in our case, a single valve).

The set-ups are similar.

Some notes:

We used 2 different brands of transmitters, and wired them separately (went to different JB and homerun cables) back to the safety system. The safety terminals in the JB are different colour from the DCS terminals, and segregated as well.

You may want to locate your sensing lines in different locations in the pipe (in case of fouling), and at least run them on separate side of the pipe back to the valves

"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?