[MW:753] Re: RBI tool for Aboveground Storage Tanks

Dear Mr. Tagore, Thanks for your immediate reply. API has yet to release the appendix related to AST as part of API-581. I understand API is in the initial stages of developing the logic for the AST RBI/temporarily stopped the further development. However, some consultants might have developed their own RBI software for AST evaluation and few oil companies might have implemented them. Example: ------has a very effective RBI software for static equipment/piping excluding AST. However their incomplete version of AST software is also available in the market but without roof evaluation. Our requirement is specific, to have RBI software for AST including fixed/floating roof evaluation. Pl. share with me if you come across any agency/company supplying complete AST RBI evaluation. Regards Srinivasa Murthy Hari On 4/27/08, Tirumala B N Tagore <tagore.tbn@gmail.com> wrote:

Could you see API 653? It may not give RBI guidelines seperately for AST similar to guide lines for Pressure vessels. But one can use the principles. For roof inspection , the main zones are at the tank shell to roof junction , roof thickness at locations adjoining the rafters for Fixed roof/ dome roof cases. For Floating roof cases, the thickness mesurement at anti rotation guides, roof supports at LLL , where seal is atached specifically underside of the roof, where the sliding rail guides are welded , where pantoon compartments are welded and pantoon walls..

In case a specific nature , you may post it for review .

Regards,

Tagore

On 4/27/08, Hari Srinivasa Murthy <harimurthy@gmail.com> wrote:

Dear friends,

API 581 dos not provide guidelines to evaluate Aboveground Storage Tanks with Risk Based Inspection ( RBI) tools.

Can any one recommend me the names of consultants who conducts RBI studies, (either quanitative or semiquantitative) on storage tanks including tank roofs. In my experience ----provides RBI of AST excluding roofs. I would like to know industry practice in such cases.

This may be out of place to pose a query on RBI in the material&welding discussion forum, however, I know the knowledge base of our group is very strong and I am sure atleast few of the group members have RBI background and may be able to help me.

Regards

Srinivasa Murthy Hari

Kuwait