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GB/T 17283-2014 English PDF (GB/T 17283-1998)

GB/T 17283-2014_English: PDF (GB/T17283-2014)
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GB/T 17283-2014English130 Add to Cart 0--9 seconds. Auto-delivery Determination of the water dew point of natural gas -- Cooled surface condensation hygrometers Valid GB/T 17283-2014
GB/T 17283-1998English359 Add to Cart 3 days [Need to translate] Determination of the water dew point of natural gas--Cooled surface condensation hygrometers Obsolete GB/T 17283-1998


BASIC DATA
Standard ID GB/T 17283-2014 (GB/T17283-2014)
Description (Translated English) Determination of the water dew point of natural gas--Cooled surface condensation hygrometers
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard E24
Classification of International Standard 75.060
Word Count Estimation 15,122
Date of Issue 2014/12/5
Date of Implementation 2015/5/1
Older Standard (superseded by this standard) GB/T 17283-1998
Adopted Standard ISO 6327-1981, MOD
Drafting Organization Southwest Oil and Gas Field Branch China Petroleum Gas academy
Administrative Organization National Gas Standardization Technical Committee
Regulation (derived from) Announcement of Newly Approved National Standards 2014 No. 27
Proposing organization Petroleum and Natrual Gas Corporation of China
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard provides a cooling surface condensation hygrometers method for the determination of gas water dew point. This Standard applies to natural gas and similar gas water dew point measurement. The treated water dew point range pipeline gas is gene

BASIC DATA
Standard ID GB/T 17283-1998 (GB/T17283-1998)
Description (Translated English) Determination of the water dew point of natural gas--Cooled surface condensation hygrometers
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard E24
Classification of International Standard 75.06
Word Count Estimation 9,960
Date of Issue 1998/3/20
Date of Implementation 1998/9/1
Adopted Standard ISO 6327-1981, MOD
Drafting Organization China National Petroleum Corporation, Natural Gas Research Institute of Sichuan Petroleum Administration
Administrative Organization Planning and Design Institute of China National Petroleum Corporation
Proposing organization China National Petroleum Corporation
Issuing agency(ies) State Bureau of Technical Supervision
Summary This standard specifies the water dew point hygrometer for natural gas measurement, the water dew point hygrometer is measured by the stability of the steam condensate or cooling mirror hygrometer to check the mirror detects on the condensate.


GB/T 17283-2014 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 75.060 E 24 Replacing GB/T 17283-1998 Determination of the water dew point of natural gas - Cooled surface condensation hygrometers (ISO 6327.1981, Gas analysis - Determination of the water dew point of natural gas - Cooled surface condensation hygrometers, MOD) ISSUED ON. DECEMBER 05, 2014 IMPLEMENTED ON. MAY 01, 2015 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of contents Foreword ... 3  1 Scope ... 4  2 Principles ... 4  3 Performances of apparatus ... 5  4 Sources of error - General precautions for operation ... 8  5 Elimination of hydrocarbon condensates ... 10  6 Accuracy... 11  Appendix A (Informative) Structure changes of this standard as compared with ISO 6327.1981 ... 12  Appendix B (Informative) Correction of water dew point ... 14  References ... 15  Foreword This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 17283-1998 “Determination of the water dew point of natural gas - Cooled surface condensation hygrometers”. As compared with GB/T 17283-1998, the main technical content the same. This standard, through re-drafting method, modifies and adopts ISO 6327.1981 “Gas analysis - Determination of the water dew point of natural gas - Cooled surface condensation hygrometers”; AND ISO 6327 had confirmed this in 2011. This standard has a greater structural adjustment as compared with ISO 6327.1981, AND in Appendix A it provides the clause number comparison list between this standard and ISO 6327.1981. The main technical differences between this standard and ISO 6327.1981 and the causes are as follows. - MODIFY the scope of application of standard; based on the scope of application of ISO 6327.1981 “The water dew point generally ranges from -25 °C ~ 5 °C”, ADD that “Under special environment, the water dew point range may be widened”; AND expand the scope of application of this standard for the purposes of adapting to the actual conditions of the natural gas production in China. This standard was proposed by China National Petroleum Corporation. This standard shall be under the jurisdiction of the National Natural Gas Standardization Technical Committee (SAC/TC 244). The main drafting organizations of this standard. China National Petroleum Corporation Southwest Oil and Gas Field Branch Natural Gas Research Institute, Chengdu Tianke Oil and Gas Engineering Co., Ltd. The main drafters of this standard. Zeng Wenping, He Bin, Gao Xiaogen. This Standard replaces the standard previously issued as follows. - GB/T 17283-1998. Determination of the water dew point of natural gas - Cooled surface condensation hygrometers 1 Scope This standard specifies the method of using the cooled surface condensation hygrometers to determine the water dew point of natural gas. This standard applies to the determination of the water dew point of natural gas and similar gases. The water dew point of the treated natural gas is generally in the range of -25 °C ~ 5 °C. Under the corresponding gas pressure, the water content range (volume fraction) is 50 × 10-6 ~ 200 × 10-6. In special circumstances, the water dew point range may also be wider. 2 Principles 2.1 Principle of the apparatus With this type of apparatus, which determines the water content of a gas by measuring the corresponding dew point, a surface (generally a metallic mirror), the temperature f which may be artificially lowered and accurately measured, is exposed to a sample of the gas being tested. The surface is then cooled to a temperature at which condensation occurs and is observed as dew. Below this temperature, condensation increases with time, whilst above it, condensation decreases or does not occur. This surface temperature is then (for practical applications) taken as the dew point of the gas flowing through the apparatus. 2.2 Determination of water vapor pressure The partial water vapor pressure in the gas samples is the saturated vapor pressure corresponding to the observed dew point, provided that the gas in the hygrometer is at the same pressure as the gas at the time of sampling. REFER to the relevant manual for the relationship between saturated water vapor pressure and temperature. It shall be noted that if methanol is present, this method determines the methanol in addition to water. However, if the methanol content is known, the The manual device can involve observation of condensation with the naked eye; if a photoelectric cell is used, the mirror is illuminated by a light source built into the test cell. The lamp and photoelectric cell can be arranged in various ways, provided that diffusion in the direction of the light source from the mirror is reduced by the polishing of the mirror. In any case, the mirror must be clean before use. In the absence of any condensation, the diffused light falling on the photocell must be reduced. The effects of light diffused from internal surfaces of the cell can be reduced by blackening these surfaces AND this precaution can be supplemented by an arrangement of the optical system so that only the mirror is illuminated AND the photocell views only the mirror. 3.4 Methods for cooling the mirror and controlling its temperature 3.4.1 General The following methods are used for reducing and adjusting the mirror temperature. The methods described in 3.4.2 and 3.4.3 require constant attention from the operator AND are not suitable for automatic devices. For automatic devices, two cooling methods are used. indirect contact with a coolant OR cooling by the thermoelectric (Peltier) effect as described in 3.4.4 and 3.4.5. In any case, the rate of cooling of the mirror shall not exceed 1 °C/min. 3.4.2 Solvent evaporation A volatile liquid in contact with the rear face of the mirror can be evaporated AND cooled by an air flow. Hand bellows are generally used for this purpose, BUT an adjustable source of low pressure compressed air or any other suitable pressurized gas is preferable. The liquid used can be ethylene oxide, a very efficient liquid giving cooling of the mirror of approximately 30 °C, without effort, when hand bellows are used. However, if toxicity is a risk, acetone can be used to obtain cooling of approximately 20 °C with hand bellows OR even greater cooling with compressed air or other suitable pressurized gas. 3.4.3 Gas cooling by adiabatic expansion The mirror can be cooled by discharging onto its rear face a gas which has just expanded through a nozzle. Compressed carbon dioxide, available from small cylinders, is often used for this purpose, BUT other gases such as compressed air, compressed nitrogen, propane, or halogenated hydrocarbons can also be used. Mirror temperatures of at least 40 °C below the gas sample temperature can be obtained. introduced into the test cell, can also induce an observed dew point different from the dew point which would correspond to the actual water vapor content. 4.1.2 Solid impurities If solid impurities are absolutely insoluble in water, they do not modify the observed condensation temperature, BUT can hinder condensation observation. In an automatic device, without a compensation device for such impurities, these tend to obstruct the operation of the device if the amount of condensate is low. Defects resulting from an excess of solid impurities on the mirror generally result in an unexpected increase of the mirror temperature for a few minutes AND call for dismantling of the device AND cleaning of the mirror. (It is essential for this purpose that the hygrometeric cell can be rapidly dismounted). It may be desirable to remove solid impurities by using a non-hygroscopic filter to avoid such difficulties. If a filter is used, even if it is stated to be non-hygroscopic, it shall be in equilibrium water the water vapor content of the gas; this is obtained by allowing gas to flow through it for a period of time before the test at a rate considerably higher than that to be used during the test. To prevent the influence of dust particles, some automatic devices are fitted with a “calibration sequence”. This consists of an optional superheating of the mirror, so as to remove all condensate, water and hydrocarbons, followed by a rebalancing of the measuring bridge. 4.1.3 Impurities in vapor form Hydrocarbons can condense on the mirror. In principle, these do no interfere because hydrocarbon surface tension is very different from that of water. They spread on the mirror AND form a continuous layer which does not diffuse light. Manual detection of condensates is, nevertheless, not easy because although the dew point is very much lower than the condensation temperature of hydrocarbons, only a few water droplets can be detected in a large hydrocarbon ... ......

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