Category: Gas Specifications

Odorization

Regulatory codes applicable to the distribution of natural gas and LP gas require these gases to be odorized such that the gas is readily detectable by a distinct odor, at one-fifth of the lower limit of flammability of the gas in .12 An excellent reference covering • Odorization regulations• Chemical and physical properties of odorants• […]

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Non-Specification Contaminants

Although the range of possible contaminants in LP-gas is very great, serious problems are rare, but can occur. The most serious contaminants encountered are ammonia, fluorides, and organic fluorides. NFPA 5812 stipulates that LP-gas “shall not contain ammonia,” because of its propensity to induce stress corrosion cracking in copper and brass fittings commonly used in […]

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Non-volatile Residue

The non-volatile residue specification imposes a rigid limit on extraneous contaminants boiling above 100°F, which may result in fouling of vaporizers used in liquid withdrawal systems. The principal sources of such contaminants are typically compressor oils, valve lubricants, plasticizers from rubber hoses, corrosion inhibitors, or other heavy petroleum products from pumps, pipelines, or storage vessels […]

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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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