[deepu]

Hi Jop,

Can I sent some info through email as I cannot attach.Thanks.

Deepu

[deepu]

Yes PMI is Positive material identification.Thanks

[deepu]

Good article Srivallabha. I like the message. How can we develop that culture in an organisation.Any ideas please
deepu

[deepu]

Hi Jop,

Thanks for the reply.
The procurement of pipe fittings valves(especially custom made valves which may have a long lead time) etc from different countries creates a situation where we need assurace regarding quality.One way of acheiving this is to ensure the extend of QC monitoring attributed to each items is consistent with the complexity and application of these items in relation to their design fabrication and process operating requirements.
I will reproduce from the project procedure document for criticallity and inspection levels

1.For level 1 criticality rating and inspection level 1
Resident inspector or regular presence /High visibility of inspector at supplier and /or Subcontractors premises

2.For level 2 criticality rating and inspection level 2
Attend hold and witness points as specified in supplier ITP’s

3.For level 3 criticality rating and inspection level 3
Witness Factory Accepted testing(FAT) or Site Acceptance Testing(SAT)

4.For level 1 criticality rating and inspection level 4
Receipt inspection only

I think if we procure an item which takes high lead time it needs to have a high QC inspections during their manufacture especially if it is manufactured and procured directly from a distant country.
In my question I was looking for assigning criticallity rating for different valves viz.large bore actuated ball valves(Top/side/side&top entry-flanged and welded),Small bore manual ball valves(side entry),small bore check valves,small bore globe valves,Double block and bleed valves,pressure regulators and pressure safety valves.

Criticallity is determined by a rating criteria of personal safety,hazard to environment,fluid characteristics,economics in case of an operational failure,Economics in relation to design or manufacturing failure or rework,design complexity and availability of proven design,complexity of manufacture,complexity of maintanence after failure and material traceability and identification.
we give different points to each criteria and if the total valve comes between a particular range it will be rated level 1,2,3 or 4.
I would like to know what is the order of complexity for different types of valves based on experience.

Any thoughts are welcome.

Thanks
Deepu

[deepu]

Thanks Jop.I think that is a bypass valve.This was used for metering station for permitting single parallel or series route operation.

[deepu]

Thanks for the reply.
Can you please explain why the process affected if noncondensable gas or air are trapped in the system. Also can you explain what is meant by”positive pressure being maintained over a period of time”.
Thankis

[deepu]

Thanks for the reply.
Is every seamless pipe manufactured undergone hydrotesting. Is it practically possible.If it is not practically possible Why only some pipe material certs says not hydostatically tested. Can someone throw some light on this.Thanks

[deepu]

Thanks Jop
The flange closure summary I found from previous test packs is showing the description of line to be tested for e.g.: discharge to after cooler TIP, the Iso number,flange number, flange size,flange rating gasket type stud type stud length final torque and checked and signed by contractor representative and client. I think the flange closure summary is about dividing iso into spools and while testing each spool how can we seal a spool .For each spool they mark a number in iso e.g.: FL-001, Fl-002 etc. This may be used for isolation.This one is different to the project I am doing.I was looking at the old marked up Isometrics and test packs.Is it some thing we normally do for testing?

The modules (which are hydro tested overseas) are connected using golden welds for that hydro testing is not needed on site.
Individual spools are tested overseas but whole sub system after installation needs to hydro test on site.
Whether I am making things clear.
regards,
deepu

[deepu]

Thanks Jop.It was heartening to see your reply from a different part of the world this morning.Thanks again for your detailed reply.

I also have some more doubts.

1.Regarding Flange Closure summary used in hydrotesting.The principle behind why we need to do it is it only to close the ends at correct torque before hydro testing. Are we need to use only the same schedule blind flange for it.What are the complications that can arise or what all things one should know before doing Flange closure summary

2.What all conventions we need to follow while doing the markup of the line to be tested in the P&ID and Isometrics.What all things one should keep in mind while doing the markup.What common mistakes we need to avoid

3.Who determines the test limits, will we be normally issued a document which shows the line or spools to be tested in a particular order. Normally what is the criteria with which the test limits are determined.

4. In my particular case since it is modular construction the spools have been already hydrotested overseas and I imagine we need to install on site and do hydrotesting together.Has any one have experience in this kind of installation and testing

I appreciate and value every ones inputs
Thanks again
Deepu

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