ASTM D1142 PDF

Historical Version s - view previous versions of standard. More D Excess water vapor can cause corrosive conditions, degrading pipelines and equipment. It can also condense and freeze or form methane hydrates causing blockages. Water—vapor content also affects the heating value of natural gas, thus influencing the quality of the gas. This test method permits the determination of water content of natural gas.

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Standard Test Method for Water Vapor Content of Gaseous Fuels by Measurement of Dew-Point Temperature1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 2. Terminology 1. When a gas containing water NOTE 1—Some gaseous fuels contain vapors of hydrocarbons or other components that easily condense into liquid and sometimes interfere with vapor is at the water dew-point temperature, it is said to be or mask the water dew point.

When this occurs, it is sometimes very saturated at the existing pressure. With this attachment it is possible, in some 2. However, if the dew point of the condensable hydrocarbons is higher than the water vapor dew point, the existing pressure. Best results in 3. Significance and Use distinguishing multiple component dew points are obtained when they are 3.

At lower temperatures an ice point rather than a water dew point likely will be observed. The minimum dew point of any vapor that It can also condense and freeze or form methane hydrates can be observed is limited by the mechanical parts of the equipment. Apparatus safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- 4.

Published June Originally flowing gas comes in contact, to a temperature low enough to approved in Last previous edition approved in as D — 95 The thermometer well is integral with the. Cooling of rod F is accomplished by vaporizing a 4. The lower header is connected with the upper is deposited, is protected from all gases other than the gas header by numerous small holes drilled in the copper body under test. The apparatus may or may not be designed for use through which the vaporized refrigerant passes.

The chiller is under pressure. The 4. Observation of the dew deposit is made satisfactory for determining the dew point of gaseous fuels. Briefly, this apparatus consists of a metal chamber into and out 4.

Gas entering the apparatus through valve A is which C is cooled. Since stainless steel is a relatively poor deflected by nozzle B towards the cold portion of the apparatus, thermal conductor, the central portion of the mirror is thus C. The gas flows across the face of C and out of the apparatus through valve D. The arrangement for measuring the tempera- 2 ture of the target mirror, C, also should be noted. The Deaton, W. For accurate results, the fitting, I. The stud to which the stainless steel mirror is cooling and warming rates should approximate isothermal silver-soldered is a part of the base of the thermometer well, conditions as nearly as possible.

The most satisfactory method and as there is no metallic contact between the thermometer is to cool or warm the target mirror stepwise. Steps of about well and the cooling tube, other than through its base, the 0. When dew has rather than some compromise temperature influenced by the been deposited, allow the target mirror to warm up at a rate temperature gradient along the cooling tube as would be the comparable to the recommended rate of cooling.

The normal case if this type of construction were not used. The RTD will warming rate usually will be faster than desired. To reduce the include suitable electronics and display. Repeat the cooling and warming apparatus are reported2 to permit a determination with a cycles several times. The arithmetic average of the tempera- precision reproducibility of It is estimated that water dew points may be determined 6.

The pressure do not form during the determination. Procedure 6. Calculation 5. Do not take at a point 6. The temperature of the pipelines leading the which the determination was made. The temperature and the pressure at which it was determined see determination may be made at any pressure, but the gas Note 3 , as follows: pressure within the dew-point apparatus must be known with an accuracy appropriate to the accuracy requirements of the test.

The pressure may be read on a calibrated bourdon-type pressure gage; for very low pressures or more accurate measurements, a mercury-filled manometer or a dead-weight gage should be used. The rate of flow is not critical but should not be so great that there is a measurable or objectionable drop in pressure through the connecting lines and dew-point apparatus.

A flow of 0. The rate of cooling may be as rapid as desired in making a preliminary test. Precision and Bias Since the vapor pressure of subcooled liquid water is greater than ice at the same temperature, the weight per cubic foot of water vapor in 7.

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Jump to Page. Search inside document. Designation: D — 95 Reapproved Standard Test Method for Water Vapor Content of Gaseous Fuels by Measurement of Dew-Point Temperature1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

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IMPRESORA ZEBRA TLP 2844 PDF

264412852-Astm-d1142.pdf

Water Vapor Content of Gaseous Fuels by Measurement of Dew-Point Temperature1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Terminology 2.

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