Abstract: A composition analyzer and a method of use for determination of the masses of individual components in a multiphase multicomponent fluid system containing a gas. Data and relationships not measured by the analyzer during operation but required by the method are predetermined or researched and stored, and other required data is instantaneously obtained from the composition analyzer during process operation. All these data are used in an iteration process to accurately determine the mass composition of each fluid component. The preferred means for adding energy to the fluid mixture in the test apparatus is comprised of an electrically conductive conduit through which the fluid mixture flows and which heats the fluid mixture when electrically energized.

Abstract: A method determining the concentrations of fluids in a two-part fluid system. The heat loss in a test apparatus for measuring the temperatures and flow rate of a flowing fluid mixture is determined and the specific heat of the fluid mixture is calculated. Knowing the relationship between the specific heat of the fluid and its composition allows the fluid composition to be directly calculated, and hence the ratio of the two constituent fluids to be determined. A preferred heater is comprised of an electrically conductive conduit through which the fluid mixture flows which when energized efficiently heats the fluid mixture.

Abstract: The present invention relates to a duckbill conservation vent valve comprising an elastomeric tubular body having an axial fluid passageway with an inlet and an outlet. The tubular body progressively narrows in cross section from inlet to outlet, forming opposed sealing lips at the outlet. The lips define a closed slit therebetween. The slit is opened in response to pressure exerted from the inlet in the direction of the slit. The slit is kept closed by means such as applying either external or internal force on opposing ribs which extend radially from the tubular body or by draping a long lip over a slit and a short lip, or by stretching a short lip to equal the length of a long lip and attaching the short lip to the long lip. The duckbill conservation vent valve is capable of being opened by pressure heads of less than about 2 inches of water.