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JJF 1948-2021 English PDF

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US$529.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1948-2021: Calibration Specification for Gasoline Vapor Recovery Detectors
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1948-2021	529	Add to Cart	4 days	Calibration Specification for Gasoline Vapor Recovery Detectors	Valid

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Basic data

Standard ID: JJF 1948-2021 (JJF1948-2021)
Description (Translated English): Calibration Specification for Gasoline Vapor Recovery Detectors
Sector / Industry: Metrology & Measurement Industry Standard
Word Count Estimation: 23,259
Issuing agency(ies): State Administration for Market Regulation

JJF 1948-2021: Calibration Specification for Gasoline Vapor Recovery Detectors

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for Gasoline Vapor Recovery Detectors National Metrology Technical Specification of the People's Republic of China Specification for calibration of vapor recovery detectors Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Specification for calibration of vapor recovery detectors Focal Point. Liquid Flow Sub-Technical Committee of National Flow Measurement Technical Committee Main drafting unit. Hebei Institute of Metrology Supervision and Inspection China Institute of Metrology Guangdong Institute of Metrology Participating in the drafting unit. Hebei Metrology and Testing Technology Center Qingdao Metrology Technology Research Institute Qingdao Laoying Environmental Technology Co., Ltd. This specification entrusts the liquid flow sub-technical committee of the national flow measurement technical committee to be responsible for the interpretation The main drafters of this specification. Fang Jing (Hebei Institute of Metrology Supervision and Inspection) Wang Long (Hebei Provincial Institute of Metrology Supervision and Inspection) Gao Feng (China Institute of Metrology) Cui Houxiang (Guangdong Institute of Metrology) Participating drafters. Li Tongbo (Hebei Metrology and Testing Technology Center) Xia Chun (Qingdao Metrology Technology Research Institute) Chen Zhonghui (Qingdao Laoying Environmental Technology Co., Ltd.)

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and units of measurement(1) 3.1 Terminology (1) 3.2 Units of measurement (1) 4 Overview(2) 5 Metrology Characteristics(2) 5.1 Pressure measurement characteristics (2) 5.2 Flow measurement characteristics(2) 5.3 Timing error(3) 6 Calibration Conditions(3) 6.1 Environmental conditions (3) 6.2 Measurement standard device and supporting equipment (3) 7 Calibration items and calibration methods (3) 7.1 Pre-calibration check(3) 7.2 Pressure metering characteristics (4) 7.3 Flow measurement characteristics(5) 7.4 Timing error(7) 8 Expression of calibration results (7) 9 Recalibration interval(7) Appendix A Uncertainty Evaluation Example of Pressure Indication Error Measurement Results(8) Appendix B Example of Uncertainty Evaluation of Measurement Results of Cumulative Flow Indication Error of Detector(10) Appendix C Example of Uncertainty Evaluation of Measurement Results of Detector Instantaneous Flow Indication Error (13) Appendix D Vapour Recovery Detector Calibration Original Record Format (16) Appendix E Calibration Certificate (Inner Page) Reference Format (18)

Introduction

This specification is based on JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Specifications", JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Representation", JJF 1001-2011 "General Metrology Terms and Definitions" and other specifications. The main technical indicators of this specification refer to GB 20952 "Gas Station Air Pollutant Emission Standard", calibration method The formulation is based on JJG633-2005 "Gas Positive Displacement Flowmeter", JJG640-2016 "Differential Pressure Flowmeter" and Technical documents such as JJG875-2019 "Digital Manometer". This specification is published for the first time. Specification for calibration of vapor recovery detectors

1 Scope

This specification is applicable to the oil and gas recovery of which the flow measurement principle is differential pressure type and volume type, and the pressure measurement is digital pressure gauge. Calibration of the detector.

2 Reference documents

This specification references the following documents. JJG633-2005 Gas volumetric flowmeter JJG640-2016 Differential pressure flowmeter JJG875-2019 Digital pressure gauge GB 20952 Gas Station Air Pollutant Emission Standard For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Terminology and units of measurement

3.1 Terminology Terms defined in JJG633-2005, JJG640-2016, JJG875-2019 and GB 20952 and the following terms and Definitions apply to this specification. 3.1.1 Oil and gas gasolinevapor [GB 20952-2007, 3.2] Volatile organic compounds (non-methane total hydrocarbons) produced during refueling, unloading, and storage of gasoline at gas stations. The volatilized oil and gas are sealed and collected, and the oil and gas-air mixture is mixed by absorption, adsorption, condensation, etc. The process of separation and recycling. 3.2 Units of measurement The unit of measurement is shown in Table 1. Table 1 Units of measurement Quantity name unit unit symbol volume Cubic meters m3 flow Liters per minute L/min Cubic meters per [hour] hour m3/h ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1948-2021_English be delivered?

Answer: Upon your order, we will start to translate JJF 1948-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1948-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1948-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.