Dry-Seal Wiggins Gasholder

The dry-seal Wiggins gasholder is a device for storing gas, designed by John Wiggins and first manufactured in 1940 after being developed in 1936, and it saw widespread use across the United States. Rather than the classic telescoping tank sealed by a ring of water, it uses a rigid piston fitted with a flexible rubber sealing membrane that rolls between the tank shell and the piston as the stored gas volume rises and falls, giving a frictionless, self-centering seal. A dry-seal Wiggins holder is built from a foundation and concrete base, a main tank made up of a bottom, shell and roof, and the piston assembly with its deck and fender, along with anti-corrosive treatment and safety fittings such as pressure relief valves and level-monitoring instruments. Units built to this design range from about 200 to 165,000 cubic meters in capacity and operate at pressures of roughly 15 to 150 millibars. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/