Inspection Frequency 1

[Corgas]

This double wall tank storages H2SO4 and is made of HDXLPE (crosslinked HDPE). Wall thickness calcs were done according to ASTM D 1998.

Is there a standard similar to API 653 for non-metal tanks? intention is to assign inspection interval and use some kind of "inspection checklist" similar to API 653 Annex C.

Thanks,

Corgas

 

[ledon]

What code was this tank manufactured to? Many vessels of this type are covered under UL specifications.

 

[Corgas]

ledon<

I asked same question and was told that tank wall thickness were calculated according to ASTM D 1998.

 

[ledon]

ASTM D-1998 only governs the manufacture. I would base my inspections off of the service code requirements. If you are using it in severe service I would recommend a baseline UT thickness scan with an annual inservice verification. This would give you a safe basis to calculate any wear or errosion due to service.

 

[Duwe6]

And use the results of each inspection to shorten or extend the Inspx interval. Set up your Inspx program similar to either API-510 or -653, and document everything.

I would take the -653 checklist and delete everything that does not apply, and call it my "HDXLPE H2SO4 Program" checklist. Some kind of Internal Inspx should be included.