Abstract: Current self-contained gas delivery systems that provide gas vapor from a liquefied gas source such as odorized liquid propane consist of a single tank, or container. Both liquid and gas are contained in this tank. Fuel gas is supplied to the user from the vapor phase above the liquid. Boil off from the liquid phase to replace the withdrawn vapor phase results in low initial odorant levels, which increase to very high levels as the liquid is used up. This invention corrects this problem by the addition of a second tank or a second compartment within the first tank. The second tank or compartment, which contains gas phase only, is connected to the first compartment containing the liquefied gas by a small-diameter tube immersed in the liquid phase. The second compartment is positioned or valved in such a way that no liquid will accumulate in the compartment. The gas delivery valve to the gas user is located on the second, or vapor-phase-only container.

Abstract: A gas calorimeter and method of measuring the calorific value of fuel gases in which a fixed volume of gas to be measured is burned in a controlled environment. The temperature increase of the air in the environment caused by the burning is used to determine the calorific value of the gas. The gas to be measured is intermittently supplied to the controlled environment using a base plate which has portions defining a plurality of dispersion holes in a distributed manner so that a greater number of the plurality of dispersion holes are in and around the periphery of the base plate than are in and toward the center of the base plate.