ASTM D1835 PDF

More D H0 Standards Related Products Standard References Abstract This specification covers liquefied petroleum gases consisting of propane, propene propylene , butane, and mixtures of these materials. The products are intended for use as domestic, commercial and industrial heating, and engine fuels. Care must be taken to in sampling of the liquefied gases for test results to be significant. All four types of liquefied petroleum gases covered by this specification should conform to the specified requirements for vapor pressure, volatile residue, residue matter, relative density, and corrosion. This abstract is a brief summary of the referenced standard.

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Since the last three uses of those listed are in the category of specialty applications which involve special requirements, they are excluded from consideration in the specifications. In many cases it will be found that products meeting the specifications will also be usable in applications other than the ones for which they were designed. The following can be accepted as a general guide in the more common use applications of the three types of fuels: X1.

The composition of liquefied gases can vary widely depending upon the source and the nature of the treatment to which the products have been subjected. Important uses are, 1 as domestic, commercial, and industrial fuels, 2 as a carbon source material in metal treating operations, 3 as refinery raw materials for synthetic gasoline production, and 4 as petrochemical raw materials.

The nature 2 for all liquefied petroleum gas products. For that reason, limits are specified for residue content, copper corrosion, sulfur content, moisture content, and free water content to provide assurance of product dependability under the more extreme conditions of use.

Control of residue content is of importance in applications where the fuel is used in liquid or vapor feed systems where fuel vapors are withdrawn from the top of the LPG storage container. In either case, failure to limit the permissible concentration of residue materials may result in troublesome deposits or regulating equipment may become fouled, or both. The copper corrosion test will detect the presence of hydrogen sulfide, which is highly toxic. The copper corrosion limits also provide assurance that the LP-Gas will not contain H2S in such quantities as to present a health and safety hazard if it is known that the product does not contain corrosion inhibitors or other chemicals which diminish the reaction with the copper strip.

In addition, Test Method D is recommended as a field test and added safeguard to ensure that LP-Gas does not contain detectable amounts of hydrogen sulfide.

The limit on sulfur content minimizes sulfur oxide emissions and limits potential corrosion by exhaust gases from combustion of LPG. This measurement is a requirement only on the commercial and special duty propane types of liquefied petroleum gas. The purpose of moisture content control is to provide assurance that pressure reducing regulators and similar equipment will operate consistently without troublesome freeze-ups caused by the separation of dissolved water from the product.

These two types of products are normally used under ambient conditions which are mild and, as a consequence, the only requirement is vigilance to assure that no free water is present. Commercial propane is suitable for certain low severity internal combustion engine applications. The various mixtures find application as domestic, commercial, and industrial fuel in areas and at times when low ambient temperature conditions are less frequently encountered.

It is similarly used in industrial applications where problems of fuel vaporization are not present. Fuel products of this type will be less variable in composition and combustion characteristics than the other products covered by this specification.

Consequently, the important characteristics of these products can be defined and controlled by a relatively few simple measurements.

The specification test methods provided achieve the desired results. The significance of the various tests as they can apply to consumer problems is summarized here. It can be considered as a semiquantitative measure of the amount of the most volatile material present in the product.

It can also be used as a means for predicting the maximum pressures which may be experienced at fuel tank temperatures. Vapor pressure becomes more significant when it is related to volatility. Coupled with a vapor pressure limit, it serves to assure essentially singlecomponent products in the cases of commercial propane and commercial butane fuel types.

When volatility is coupled with a vapor pressure limit which has been related to gravity, as in the case of the commercial PB-mixture type of fuels, the combination serves to assure essentially two component mixtures for such fuels. When coupled with a proper vapor pressure limit, this measurement serves to assure that specialduty propane products will be composed chiefly of propane and propylene and that propane will be the major constituent.

It becomes of value only when related to vapor pressure and volatility. Since relative density is of importance in meeting transportation and storage requirements it is always determined D The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Related Interests.

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