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I do agree with PAN. If you go on with blanketing on this size of tank, you will a huge cost of nitrogen consumption. I never seen such big tanks with blanketing. You should go ahead with internal or external floating roof.

First question would be which size of floating suction line you are using, and with which kind of swing joint. If you are using a non symetrical swing joint, you may face troubles. In order to avoid this, you could use a diffuser (12"x16" for instance) with holes equally distributed. This would...

Are your tanks equipped with floating suction lines, which would avoid to pump out all the bottom sediments and water that we usualy find here??? An other solution to avoid moisture comming inside the product is to install an internal floating cover (for the aboveground only, of course!!!) try...

You can also try Entrepose Contracting, who manufactured many tanks of this type.

As far as I understood, the P/V is installed on your floating roof. As you said, it could either be a rim vent or a breather. But I don't think it is a rim vent as rim vent are only used for pantograph type peripheral seals, and rim vent are pressure only vents. Thus I would suggest it is a...

I would say yes, you need EExd, coupling and nipple. The best thing would be to directly take contact with your supplier, who maybe has a solution to upgrade your system. At least, you have to contact him to know if the fact of adding elements to its equipment will not void the EEx certification

Are you willing to detect an irisation or a real leak (let's say 5mm of diesel above water). This is an important point to check, cause the equipments are not the same.

I do not agree with IFR regarding API. Maybe I missread them, but for me, nowhere is stated that non-metallic versions of full-contact decks are not recognised.

I would advise not to try to design it by yourself, but rather to take direct contact with specialists like Shand&Jurs in US or Elmac in UK. Normally this kind of equipment has to be approved by agencies such as UL, FM or ATEX

Georginr Do you use pressurised nitrogen to clean your inlet and outlet pipes. This could also be the cause of the problem if cleaning is done when floating roof is in the lower portion of the tank.

You can also try sandwich panel full-contact types http://www.larco.fr

I absolutely do agree with SteveBraun, as hexane is one of the most volatile product and thus calculations given by API method are really conservative. No real needs to go further into detailled calculations as the ank is a new tank and nozzle can be manufactured accordingly. http://www.larco.fr

which kind of informations are you looking for?? Their main advantages are that it is symetrical and that it uses a spring to compensate for the gear wear area, and keep a very good sealing. We've been using LARCO's FSU for 25 years without having ever change any spare part