Abstract:
Disclosed is a liquefied natural gas storage apparatus. The apparatus includes a heat insulated tank and liquefied natural gas contained in the tank. The tank has heat insulation sufficient to maintain liquefied natural gas therein such that most of the liquefied natural gas stays in liquid. The contained liquefied natural gas has a vapor pressure from about 0.3 bar to about 2 bar. The apparatus further includes a safety valve configured to release a part of liquefied natural gas contained in the tank when a vapor pressure of liquefied natural gas within the tank becomes higher than a cut off pressure. The cut off pressure is from about 0.3 bar to about 2 bar.
Abstract:
Disclosed is a liquefied natural gas composition. The composition contains methane, ethane and propane and butane. The composition contains a substantial amount of butane while being substantially free of hydrocarbon molecules larger than butane.
Abstract:
A developer supply and recovery system used with a wet electro-photographic image forming apparatus includes a supply pump installed on a supply line to supply a developer from an ink cartridge to a development bath, a recovery pump installed on a recovery line to recover the developer from a developer container to the ink cartridge, an overflow sensor installed at the developer container to sense the developer overflowing from the development bath, a control unit to control the supply pump and the recovery pump in response to a sensed value of the overflow sensor, wherein operation states of the supply pump and the recovery pump are sensed, and the developer is appropriately contained in the developer container such that air is not introduced together with the developer recovered to the recovery pump, thereby reducing noise.