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Hi, We have recently inspected Pontoons of double deck floating roof diesel tank and we have found a mixture of water and hydrocarbon inside pontoons. All pontoons have mostly found full of water with layer of diesel/hydrocarbon on the top. In addition to pontoon inspection, we have found 09...

Hi HYURKAK, We have found water in pontoons and to lower the tank roof on its maintenance legs, I am asking whether the roof legs can withstand this extra water load? Or we have to drain the water from pontoons and then land the roof on legs

Can the floating roof legs can take additional weight if water is present on pontoons or legs can only take the weight of floating roof? Following is mentioned in API 650 Annex C para 3.10.2 " The legs and attachment shall be designed to support the roof and a uniform load of at least 1.2 Kpa...

The DIP measurement only gives the outcome of increase in water level while the diesel level maintained the same.

We have done some visual inspection from top platform of tank (as ladder steps degree is not suitable) to access on roof is not possible without any crane& man box. From visual, we have found small holes due to corrosion on the top roof and seems water can seep from top roof. (In this case...

We have a floating roof tank which is used for storage of diesel. Following are the tank specification. Diameter of Tank: 34 meter Height of tank : 14 meters Roof is double deck type Make: Bernard & Smith The roof of tank is double deck type and last refurbishment of tank was done in 2000 in...