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Although in some sense simply a variation on a masonry heater, most rocket mass heaters are distinct in producing immediate radiant heat (from the metal "burn" barrel), in being constructed of much cheaper materials (usually a cob mass, 55 gallon steel drum, and small brick firebox), and in requiring less robust a base to be constructed on ...
Typically steel 55-US-gallon (210 L) drums are used as burn barrels, with air vent holes cut or drilled around the base for air intake. [9] Over time, the very high heat of incineration causes the metal to oxidize and rust, and eventually the barrel itself is consumed by the heat and must be replaced.
The experiments led to a particularly promising arrangement: a forty-gallon steel drum [nb 2] buried in an earthen bank with just the round front end exposed. At the back of the drum was an explosive which, when triggered, ruptured the drum and shot a jet of flame about 10 feet (3.0 m) wide and 30 yards (27 m) long. [1]
A 200-litre drum (known as a 55-gallon drum in the United States and a 44-gallon drum in the United Kingdom and the rest of the world) is a cylindrical container with a nominal capacity of 200 litres (55 US or 44 imp gal). The exact capacity varies by manufacturer, purpose, or other factors.
Generally explosives are placed within 55 gallon drums, the explosives are surrounded by fire retardant chemicals, and then the drums are wrapped with insulating material. A horizontal crane is used to bring the drum as close to the wellhead as possible. [2] This method was depicted in the 1968 film Hellfighters starring John Wayne.
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