This standard specifies the technical requirements, test methods and inspection rules for natural gas. This standard applies to commercial natural gas produced from gas fields and oil fields and transported through pipelines after pretreatment. GB 17820-1999 Natural Gas GB17820-1999 Standard download decompression password: www.bzxz.net

GB17820—1999wwW.bzxz.Net
Based on the industry standard SY7514-1988 "Natural Gas", this standard summarizes the practical experience of the past 10 years, refers to ISO13686-1998 "Natural Gas Quality Index" and foreign natural gas pipeline transportation specifications, classifies natural gas according to sulfur and carbon dioxide content, and puts forward technical requirements for natural gas to ensure the safe operation of gas pipelines and the safe use of natural gas, which is conducive to improving environmental quality and meeting the development needs of my country's natural gas industry.
Appendix A of this standard is the appendix of the standard.
Considering the current status of natural gas production and transportation in my country, natural gas in old gas fields and old pipeline areas will implement this standard from July 1, 2001.
This standard is proposed by China National Petroleum Corporation. This standard is under the jurisdiction of the Planning and Design Institute of China National Petroleum Corporation. The drafting unit of this standard: Natural Gas Research Institute of Sichuan Petroleum Administration Bureau. The participating drafting units of this standard: Survey and Design Institute of Sichuan Petroleum Administration Bureau. The main drafters of this standard are Chen Guangliang, Yuan Qingmin, Su Jianhua, Tang Meng, Chen Rongsong, Zhou Zhiqi and Zhang Shenyuan. 1 Scope
National Standard of the People's Republic of China
Natural gas
This standard specifies the technical requirements, test methods and inspection rules for natural gas. This standard applies to commercial natural gas produced from gas fields and oil fields and transported through pipelines after pretreatment. 2 Referenced standards
GB17820—1999
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T11060.1—1998 Determination of hydrogen sulfide content in natural gas Iodometric method Determination of total sulfur in natural gas Oxidative microcoulometry GB/T11061—1997
GB/T11062—1998
GB/T13609—1999
GB/T13610—1992
GB/T17283—1998
Heating value, density, relative density and Wobbe index of natural gas Calculation method of number Guidelines for natural gas sampling
Analysis of natural gas composition Gas chromatography
Determination of water dew point of natural gas Cooled mirror condensate hygrometer method GB50183—1993
Code for fire protection design of crude oil and natural gas engineering GB50251—1994
Code for design of gas pipeline engineering
3 Product classification and technical requirements
3.1 Natural gas is divided into Class I, Class II and Class III according to the content of sulfur and carbon dioxide. 3.2 The technical indicators of natural gas shall comply with the provisions of Table 1. 3.3 For natural gas used as civil fuel, the total sulfur and hydrogen sulfide content shall comply with the technical indicators of Class I or Class II gas. Table 1 Technical indicators of natural gas
High calorific value, MJ/m
Total sulfur (measured in sulfur), mg/m
Hydrogen sulfide, mg/m
Carbon dioxide, %(V/V)
Water dew point, ℃
≤100
≤200
<460
≤460
Under the pressure and temperature conditions at the natural gas junction, the water dew point of natural gas should be 5℃ lower than the lowest ambient temperature 1 The standard reference condition for gas volume in this standard is 101.325kPa, 20℃. 2 For natural gas transmission pipelines established before the implementation of this standard, there should be no free water in the natural gas under the pressure and temperature conditions at the natural gas junction. Free water means that no free water can be separated from natural gas by mechanical separation equipment. Approved by the State Administration of Quality and Technical Supervision on August 20, 1999 and implemented on March 1, 2000.
4 Test methods and inspection rules
GB 17820—1999
4.1 The calculation of high calorific value of natural gas shall be carried out in accordance with GB/T11062, and the determination of natural gas composition based on it shall be carried out in accordance with GB/T13610.
4.2 The determination of total sulfur content in natural gas shall be carried out in accordance with GB/T11061. 4.3 The determination of hydrogen sulfide content in natural gas shall be carried out in accordance with GB/T11060.1. 4.4 The determination of carbon dioxide content in natural gas shall be carried out in accordance with GB/T13610. 4.5
The determination of water dew point of natural gas shall be carried out in accordance with GB/T17283. 4.6 The sampling of natural gas shall be carried out in accordance with GB/T13609, and the sampling point shall be at the natural gas handover point specified in the contract. Transportation, storage and use
5.1 Under the pressure and temperature conditions of the natural gas handover point, there shall be no liquid hydrocarbons in the natural gas. 5.2 The solid particle content in natural gas shall not affect the transportation and utilization of natural gas. 5.3 During the transportation, storage and use of natural gas, it shall comply with the relevant provisions of GB50183 and GB50251. 2
A1 Hydrogen sulfide content in natural gas
GB17820—1999
Appendix A
(Appendix to the standard)
Safety instructions and others
The purpose of specifying the hydrogen sulfide content in natural gas is to control the corrosion of the gas transmission and distribution system and the harm to the human body. In wet natural gas, when the hydrogen sulfide content is not more than 6 mg/m3, there is no corrosion to metal materials; when the hydrogen sulfide content is not more than 20 mg/m3, there is no obvious corrosion to steel or the degree of corrosion is within the acceptable range of the project. A2 Total sulfur content in natural gas
The total sulfur content requirements of natural gas for different purposes are different. As a fuel, this requirement is determined by the degree of harm to the environment and human body caused by the combustion of sulfides contained in it to generate sulfur dioxide, and relevant standards and specifications have clear provisions. As a raw material, due to the different purification depths required for different processing, there is no uniform requirement for the quality of the mine. A3 Classification of natural gas
In order to make full use of the natural properties of natural gas as a mineral resource, according to different requirements and combined with the actual situation of my country's natural gas resources, this standard divides natural gas into three categories.
Class I and II gases are mainly used as civilian fuels. The controlled content of hydrogen sulfide in commercial natural gas in various countries in the world is mostly 5-23 mg/m3. Considering that water may be added during urban gas distribution and storage, especially during mixing and adjustment. In order to prevent corrosion of the gas distribution system and ensure the health of residents, this standard stipulates that the hydrogen sulfide content in Class I and Class II natural gas shall not exceed 6mg/m3 and 20mg/m3 respectively. Class III gas is mainly used as industrial raw materials or fuel.
A4 Natural gas odorization
As a civilian fuel, natural gas should have a detectable odor; natural gas without odor or insufficient odor should be odorized. The minimum amount of odorant should meet the requirement that when natural gas leaks into the air and reaches a concentration of 20% of the lower explosion limit, it should be detectable. Odorants are often prepared with mercaptans, sulfides or other sulfur-containing compounds with obvious odors. A5 Others
Taking into account the different requirements of individual users for natural gas quality and the reality that many existing users have built natural gas purification facilities, on the premise of meeting the relevant national safety and health standards, for natural gas outside the three categories, the supply and demand parties can use contracts or agreements to determine their specific requirements.
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