If product purity is a concern you have to use floating cum cone roof.
Fixed roof vs floating roof tank.
As with the internal floating roof tanks the function of the fixed roof is not to act as a vapor barrier but to block the wind.
Domed external floating roof tanks usually result from retrofitting an external floating roof tank with a fixed roof.
The primary consideration in selecting the type of roof is to prevent the vapour loss where by emission to atmosphere is eliminated.
Instead the cfrt is equipped with a pressure vacuum pv vent and may even include a gas blanketing system such as that used with fixed roof tanks these tanks are designed as in appendix c of the api standard 650.
C the owner or operator of a storage tank shall equip the affected storage tank with either a fixed roof with internal floating roof an external floating roof an external floating roof converted to an internal floating roof or a closed vent system meeting the conditions of 63 1252 b with a control device that meets any of the following.
As per the oil indystry practice in india floating roof tank is used for storing hsd.
Floating roof also reduces the static electricity hazard.
Floating roof tank can be divided into two types internal floating roof and external floating roof.
Internal floating roof tank can be used to store gasoline jet fuel and other volatile oil and liquid chemicals like aldehydes alcohols methanol ethanol ketones acetone benzene benzene toluene xylene styrene.
I use these factors to determine whether i can use a closed cone or dome roof tank or a floating roof tank or if i need to go up to pressurized storage.
In addition to worrying about tank overpressure and vacuum and about corrosion here are a few other safety items to consider.
Perfect designed internal floating roof storage tank is the best method to control the evaporation loss of the fixed roof tank.
An internal floating roof tank is a floating roof tank fixed an extra fixed roof on the floating roof to prevent floating roof from wind and rain and guarantee the quality of the stored oil.
Floating roof tank is which the roof floats directly on top of the product with no vapour space and eliminating the possibility of flammable atmosphere.
Closed floating roof tank this has an internal floating roof but eliminates natural ventilation of the tank vapor space.
Closed floating roof tank this has an internal floating roof but eliminates natural ventilation of the tank vapor space.
