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Primary Liquid Filled Tube Seal Model No:5530 Application: The Tube Seal System is a product mounted seal. The seal design has been used on rim space between shell and floating roof tanks from 6m to 110 m diameter containing the full range of crude and refined products. Features and Benefits: The tube seal design has a separate scuff band and tube. The scuffband is designed with a ribbed surface and is produced from nylon fabric coated with a hard wearing elastomeric material to withstand contact with the roughest tank shell. The seal tube can be varied in size to suit the roof dimensions, product level and rim space. The seal tube is held between the scuffband and roof rim and is filled with liquid, normally kerosene or gas oil. The liquid filled tube forces the scuffband against the tank shell maintaining a firm contact approximately 200mm deep when the tank is in service. Weathershields can be installed as illustrated to help reduced the amount of rainwater recent years it has proved more practical and economical to fit Secondary seal. As the tube seal is product mounted. installed in contact with the stored liquid, the sealing efficiency is very high. This seal is particularly suited to out of round tanks. See data sheet.