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A dry-seal Wiggins gasholder is a device designed to hold gas.
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A dry-seal Wiggins gasholder is a device designed to hold gas.
A dry-seal gasholder can be designed to have a gross (geometric) volume ranging from 200 to 165,000 m3 (7,100 to 5,826,900 cu ft), whilst having a working pressure range between 15 and 150 millibars (1.5 and 15.0 kPa). The dry-seal gasholder is finished with an anti-corrosive treatment to counteract local climatic conditions and also any chemical attack from the stored medium. This anti-corrosive treatment is fully compatible with the sealing membrane and also the environment.[ citation needed ]
The dry seal gasholder has four major elements: the foundation; the main tank; the piston and the sealing membrane. Each of these elements can be divided into various sub-elements and associated accessories.
A concrete and hardcore base designed to withstand the weight of the steel gasholder structure constructed upon it and to withstand dynamic climatic conditions acting upon the gasholder etc.
The main tank is designed to accommodate the design requirements laid down by the customer and climatic conditions. There are three main sub-elements to the tank:
The gasholder piston moves up and down the inside of the shell as gas enters and exits the gasholder. The weight of the piston (less the weight of the level weights) produces the pressure at which the gasholder will operate. The piston is designed to apply an equally distributed weight to ensure that the piston remains level at all times. The piston made up of the following sub-elements:
The seal of the gasholder is designed to operate in the conditions specified by the client and to suit the stored medium. The seal rolls from the shell to the abutment surface of the piston and vice versa providing the piston with a frictionless self-centering facility. During depressurisation the seal (Usually rubber) also provides a gas tight facility that protects the holder from vacuum damage by blocking the gas outlet nozzle. During commissioning of the gasholder the sealing membrane is set into an operating condition. This setting must be carried out every time the gasholder is depressurised, otherwise known as "popping" the seal.[ citation needed ]
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