You have one or more DNV certified transportable tanks on board your vessel. What are the certification requirements for such a tank?
With this post we would like to give you a summary of the certification requirements that tanks in operation will need to meet.
All Helifuel transportable tanks are manufactured in accordance to DNV 2.7-1 and EN12070 Standards.
The tanks are classified as offshore tank containers for dangerous goods and must be periodical examined and tested.
The testing must be in accordance to DNV 2.7-1 and the IMGD Code.
The schedule for examination and testing of offshore containers (tanks) are as follows:
• 12 months: Visual inspection of lifting frame and slings
• 30 months: Periodic Intermediate inspection including leak proof test
• 48 months: NDE of pad eyes and slings
• 60 months: Periodic test including hydrostatic pressure test
Note: Some national authorities may have stricter requirements.
The periodic test (30 & 60 Months) can only be carried out by DNV or other authorized certifying bodies (I.E. Lloyds. BV).
An inspection report/renewal certificate will be issued by the certifying body.
The examination and testing must be marked on the tank data plates. The 12 and 48 monthly test shall also include marking on the sling ID-Tag .
Helifuel is qualified to carry out the periodic tests in-house (witnessed by DNV) both in the Norwegian and the Houston base. For the examinations and tests that cannot be performed by Helifuel we are teamed up with certified third party companies that can perform these on short notice.
Helifuel use a special made test measure equipment, that will be installed on the tank to be sure it is tested to correct test pressure.
The leak proof test pressure should be 25% of max working pressure for the tank.
The hydrostatic test pressure should be 150% of max working pressure for the tank.
At the 60 monthly periodic test we mandatory change out all gaskets/seals on the tanks, to be sure the gaskets/seals always are in good condition.