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JJF 1240-2010 English PDF

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Q: Should I purchase the latest version JJF 1240-2010?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1240-2010 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$399.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1240-2010: Calibration Specification for Gas Flow Calibration Facility by Means of Critical Flow Venturi Nozzles
Status: Valid

JJF 1240: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1240-2010	399	Add to Cart	3 days	Calibration Specification for Gas Flow Calibration Facility by Means of Critical Flow Venturi Nozzles	Valid
JJF 1240-1990	199	Add to Cart	2 days	O.T.N of the Primary Standard for the 1×1000N Force Standard Machine	Obsolete

Similar standards

GB/T 36126 JJF 1368 GB/T 1885 JJF 1250 JJF 1247 JJF 1230

Basic data

Standard ID: JJF 1240-2010 (JJF1240-2010)
Description (Translated English): Calibration Specification for Gas Flow Calibration Facility by Means of Critical Flow Venturi Nozzles
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Classification of International Standard: 17.120
Word Count Estimation: 17,112
Date of Issue: 2010-01-05
Date of Implementation: 2010-04-05
Quoted Standard: GB/T 21188; JJG 620-2008; JJG 643-2003; JJF 1001-1998; JJF 1004-2004; JJF 1059-1999
Regulation (derived from): AQSIQ Announcement No. 3 of 2010
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to critical flow venturi nozzle method the gas flow standard device (hereinafter referred to as the device) during the calibration and verification.

JJF 1240-2010: Calibration Specification for Gas Flow Calibration Facility by Means of Critical Flow Venturi Nozzles

---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 Gas Flow Calibration Facility by Means of Critical Flow Venturi Nozzles People's Republic of China National Metrology Technical Specifications Critical flow Venturi nozzle Gas Flow Standards at Issued on. 2010-01-05 2010-04-05 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Critical flow Venturi nozzle gas law Flow Standards at This specification by the State Administration of Quality Supervision, Inspection and Quarantine approved on January 5, 2010, and from From April 5, 2010 implemented. Focal point. the National Technical Committee on Metering flow capacity The main drafting units. China Institute of Metrology Participated in the drafting. Zhejiang Provincial Institute of Metrology Large national oil and gas flow metering stations Nanjing sub-station Liaoning Provincial Institute of Metrology Henan Institute of Metrology Dandong City-Bo Control Co., Ltd. This specification by the flow capacity of the National Technical Committee responsible for the interpretation of measurement The main drafters of this specification. Li Chunhui (China Institute of Metrology) Drafters participate. Xu Yinghua (China Institute of Metrology) Shen Wenxin (Zhejiang Institute of Metrology) Zhang Yuan (large national oil and gas flow metering stations Nanjing sub-station) Zhuang Tao (Liaoning Provincial Institute of Metrology) Yan Jiwei (Henan Institute of Metrology) Dingyue Chen (Dandong City-Bo Control Co., Ltd.)

1 Scope (1) 2. Referenced Documents (1) 3 Terms and Definitions (1) 4 Overview (2) 4.1 Composition (2) 4.2 works (2) 4.3 Purpose (2) 5 Metrological characteristics (2) 5.1 means the absolute pressure range (2) 5.2 means flow range (2) 5.3 nozzle discharge coefficient (3) 5.4 temperature measurement, pressure measurement instruments (3) Timer 5.5 (3) 5.6 humidity correction (3) 6 calibration conditions (3) Environmental conditions 6.1 (3) 6.2 Working medium conditions (3) 7 calibration items and calibration methods (3) 7.1 calibration items (3) 7.2 Calibration method (3) Expression 8 calibration results (4) 9 Recalibration interval (4) During the verification Appendix A (5) Appendix B humidity correction method (7) Appendix C Uncertainty assessment procedures (8) Appendix D positive pressure calibration device (10) Appendix E calibration certificate data sheet format (12) Critical flow Venturi nozzle Gas Flow Standards at

1 Scope

This instruction applies to school calibration of critical flow Venturi nozzle gas flow standard method (hereinafter referred to as the device) Verification and registration period.

2 Citations

GB/T 21188-2007/ISO 9300.2005 "with a critical flow Venturi nozzle Measurement of gas flow" JJG620-2008 "critical flow Venturi nozzle verification procedures" JJG643-2003 "standard table method flow standard device test procedures" JJF 1001-1998 "common measurement terms and definitions" JJF 1004-2004 "flow measurement terminology and definitions" JJF 1059-1999 "Evaluation and Expression of Uncertainty in Measurement" When using this specification the calibration should be noted that using the currently valid version of the documents cited.

3 Terms and Definitions

3.1 Critical Flow Venturi nozzle criticalflowVenturinozzle For measuring the gas flow rate, inlet aperture is gradually reduced and then gradually expanded to the throat, the larynx can meet the local sound Speed measuring tube (hereinafter simply referred to as nozzles). 3.2 throat throat The inner diameter of the smallest section of the nozzle. 3.3 flow coefficient dischargecoefficient, Cd Stagnation under the same parameters, flow through the nozzle of the actual mass flow qm with a one-dimensional ideal gas, isentropic flow through nozzles The ratio of the mass flow over qmi, and its expression is Cd = qmqmi 3.4 throat Reynolds throatReynoldsnumber, Rent In nozzle throat diameter d as feature sizes, using a nozzle inlet conditions stagnation gas dynamic viscosity μ0 computing Reynolds number is calculated to give the Rent = 4qmπdμ0 3.5 Critical backpressure than criticalback-pressureratio, pcr When stagnation certain parameters, the maximum mass flow through the nozzle, the static pressure at the nozzle exit its upstream Maximum pressure ratio of stagnation. 3.6 decompressing means negativepressurefacility ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1240-2010_English be delivered?

Answer: Upon your order, we will start to translate JJF 1240-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1240-2010_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1240-2010_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.

Question 5: Should I purchase the latest version JJF 1240-2010?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1240-2010 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.