Verification of sites PRVÆs

[v8landy]

Hi

I have been given the task of verifying if the sites PRV’s are correct for the application in terms of venting.

I have searched many posts and some have said (I guess more in terms of starting from scratch) leave it to the experts.

But since we already have them on site, and (?) they have thus far worked! I am just verifying this!

My stating point will be by reading off any makers names/numbers and contacting them and using their knowledge.

But I would also like to put some calculations down my self to get bonus points from my new company!

On searching this form, I have found a reference to program that was fee (?) to download from CWFC.com/farris, but I can find no reference to it.

Also as an aside, how do I contact a member on this site?

J

 

[dcasto]

Almost all relief valve vendors have programs that size their valves. So go to all of them.

You need to get hold of:

API RP520 Part I. This design manual is widely used for sizing & selection of relief valves.
API RP520 Part II. This includes methods of installation.
API RP521. Guide for pressure relief and de-pressurising systems.
API 526. Flanged steel safety/relief valves for use in the petroleum industry. Gives industry standards for dimensions, pressure-temperature rating, and maximum set pressure and body materials.
API RP527. Commercial seat tightness of safety/relief valves with metal to metal & soft seats.

OR

PrEN ISO 4126-1 Safety devices for the protection against excessive pressure - Part 1 : Safety valves
PrEN ISO 4126-2 Safety devices for the protection against excessive pressure - Part 2: Bursting disc safety devices
PrEN ISO 4126-3 Safety devices for the protection against excessive pressure - Part 3: Safety valves and bursting disc safety devices in combination
PrEN ISO 4126-4 Safety devices for the protection against excessive pressure - Part 4: Pilot operated safety valves
PrEN ISO D 4126-5 Safety devices for the protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS)
PrEN ISO 4126-6 Safety devices for the protection against excessive pressure - Part 6: Application, selection and installation of bursting disc safety devices
PrEN ISO 4126-7 Safety devices for the protection against excessive pressure - Part 7: Common data

 

[ggordil]

If you can read the tags off of the PRV's, get the serial number. Most vendors can give you information that they have based on that. I many cases it includes design information. Sometimes the information includes the controlling sizing case and required rate.

Also, I second the post above. The documents listed will provide excellent assistance in your project.

 

[BenThayer]

a detailed review of our site resulted in about 1/3 having deficiencies.

what is your company or site's policy on two phase flow?

what is the policy on compliance to PSM? what you have outlined has always been considered a good engineering practice and was required by law years ago if your site has PSM applications.

 

[dcasto]

search treads on PSV's two phase flow, you'll find lots of discussions. I do the old fashion, two, single phase flow.

OSHA's PSM is a performance based program. There is very, very little perscriptive measures. So they look for this. Do address the regulations with a policy? Do you have a proceedure that sets a standard? Do you follow that proceedure? Do you update proceedures based on inspections and maintenance? Do you have failures that put people at risk of harm?

OSHA can not tell you what is "good engineering practice", if they did, they would be practicing engineering and would be liable for any concequences.