Does external floating roof replacement require an hydrotest ?
Does external floating roof replacement require an hydrotest ?
(OP)
This is a 83 m diam x 20 m ht API 650 tank the external floating roof is to be dismantled and rebuilt with taking care about the bottom plate and no works within the critical zone; the rest of the tank is recent and was started up in May 2008 ; additionnaly a 2nd intermediate shell girder will be installed at 11 m ht
Do external floating roof replacement and additional girder installation require an hydrotest ?
Do external floating roof replacement and additional girder installation require an hydrotest ?





RE: Does external floating roof replacement require an hydrotest ?
RE: Does external floating roof replacement require an hydrotest ?
RE: Does external floating roof replacement require an hydrotest ?
RE: Does external floating roof replacement require an hydrotest ?
If recalled correctly you mentioned a double deck floating (sunken)roof damage, some 2 months back in these forums and also posted an image of mechanical excavator working inside to remove debris of damaged roof.
If this is the context then In all fairness I would go for Hydro on three accounts
1)It is safer/better for bottom plates damages revealing, if any and also for integrity assurance of the cut,re-welded shell segment test with water instead of stored material
2)Since making it again gas-free after crude Oil or whatever else of combustible flammable or volatile nature material storage for any repairs will become hell of a job
3)Even the floating roof's in-contact portions and its re-built structures as per design Bouyancy and free travel upto the top edge and back on the legs has to be ensured to avoide another failure consequently,you should appreciate.
On the above grounds I will never go further without Hydro test and floating roof's bouyancy/free travel assurance.
Best Regards
Qalander(Chem)