They make LPG (liquefied petroleum gas) vaporization units. Those machines are used to actively convert LPG to vapor so that it can be used to operate machinery. LPG naturally converts to vapor, like propane used for your grill, but some equipment may need more gas flow than will naturally occur through normal phase change. http://docs.google.com/viewer?a=v&q...y_zTAP&sig=AHIEtbQ9qghQu8D-8p0kEX1z6zxQO7lOeg