The internal floating roof of assembled storage tank,also known as inner floating plate,is a floating top cover floating on the oil tank surface and rising and falling with the oil products,which can reduce the volatilization loss of medium.Moreover,the internal floating plate can effectively isolate the medium,i.e.the storage material in the tank and the air,so as to reduce the risk level of fire and explosion to a certain extent.The dome outside the storage tank can prevent rainwater,snow and dust from entering In the tank,ensure that the medium in the tank is clean
Classification of internal floating roof of assembled storage tank:
According to the different materials,the internal floating roof of assembled storage tank can be divided into aluminum inner floating roof and steel inner floating roof.The aluminum inner floating roof adopts bionic cobweb structure,which is mainly used to store light oil,such as gasoline,aviation kerosene,etc.;the steel inner floating roof is made of 304 or 316L stainless steel,which is used for the storage tank of corrosive liquid chemicals.The service life of aluminum inner floating roof is longer than that of aluminum inner floating roof and the structural strength is greater.
The floating roof structure in the tank mainly includes:
Float,cover plate,sealing tape,main beam,auxiliary beam,outer ring beam,outrigger,anti rotation device,manhole,oil measuring,static conducting belt,connecting bolt,etc.
Requirements for installation site conditions of internal floating roof:
1.Ensure that all openings of the storage tank are completed and all accessories are welded.No hot work is allowed after the floating plate assembly;
2.If the tank needs to be derusted,it must be finished and accepted before the inner floating pan enters the tank;
3.The storage tank has completed the water test and passed the acceptance test;
4.Before stacking the components and materials on site,the storage tank must be cleaned and free of oil and sewage.It is better to isolate the tank from the ground by overhead method and adhesive tape;
5.Any welding scar,burr and other obstacles on the inner surface of the storage tank that may damage the sealing device shall be removed and the surface shall be polished smoothly;
6.The power wires required for the assembly of the inner floating plate have been connected to the tank mouth and the necessary conditions such as welding machine are prepared.Tools such as electric hand drill and electric wrench shall be used in the assembly process.The owner shall apply for the fire permit according to the relevant regulations;
7.The tank in the non new tank farm must be cleaned and ventilated to ensure that the air quality reaches the standard before assembly.