Volatile Residue

The volatile residue specification, coupled with the vapor pressure limit, assures essentially single-component products for propane and butane, and essentially two-component products for butane-propane mixtures. The predominant volatile residue in propane is butane, limited to 2.5 volume percent; the predominant volatile residue in butane is pentane or heavier hydrocarbons, limited to 2 volume percent. These […]

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Moisture Content

Moisture in propane must be controlled to very low concentrations to avoid hydrate formation in pipelines and freezing in tanks, regulating equipment, and other equipment in the distribution system. Although a properly designed and operated dehydration system produces very dry propane, moisture can and does enter the transportation and distribution system at many points, such […]

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Vapor Pressure

Vapor pressure is a critical specification that must be observed for safe and efficient utilization of propane, butane, and butane/propane mixtures in domestic and commercial installations, and to comply with various regulations governing transport vessels and cylinders. The GPA vapor pressure specification limit for propane meets the requirements of U.S. Department of Transportation regulations by […]

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