|
US$1024.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 14513.3-2020: Pneumatic fluid power - Determination of flow-rate characteristics of components using compressible fluids - Part 3: Method for calculating steady-state flow-rate characteristics of systems
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 14513.3-2020 | English | 1024 |
Add to Cart
|
5 days [Need to translate]
|
Pneumatic fluid power - Determination of flow-rate characteristics of components using compressible fluids - Part 3: Method for calculating steady-state flow-rate characteristics of systems
| Valid |
GB/T 14513.3-2020
|
PDF similar to GB/T 14513.3-2020
Basic data | Standard ID | GB/T 14513.3-2020 (GB/T14513.3-2020) | | Description (Translated English) | Pneumatic fluid power - Determination of flow-rate characteristics of components using compressible fluids - Part 3: Method for calculating steady-state flow-rate characteristics of systems | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J20 | | Classification of International Standard | 23.100.01 | | Word Count Estimation | 54,564 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2020-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 14513.3-2020: Pneumatic fluid power - Determination of flow-rate characteristics of components using compressible fluids - Part 3: Method for calculating steady-state flow-rate characteristics of systems
---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.
Pneumatic fluid power - Determination of flow-rate characteristics of components using compressible fluids - Part 3.Method for calculating steady-state flow-rate characteristics of systems
ICS 23.100.01
J20
National Standards of People's Republic of China
Pneumatic use of compressible fluid element flow
Characterization Part 3.System steady-state flow
Calculation method of characteristics
(ISO 6358-3.2014, IDT)
2020-06-02 release
2020-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Contents
Foreword I
Introduction II
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Symbols and units 1
5 Calculation assumption 2
6 Calculation of series systems 4
7 Calculation of parallel systems 9
Appendix A (informative appendix) Calculation example of the series system 12
Appendix B (informative appendix) Calculation example of parallel system 21
Appendix C (Informative) Flowchart of Calculation Procedure 27
Appendix D (informative appendix) Components whose flow characteristics are not expressed in accordance with ISO 6358 36
Appendix E (informative appendix) Visual calculation results 46
References 51
Foreword
GB/T 14513 "Determination of flow characteristics of compressible fluid components for pneumatic use" is divided into the following three parts.
---Part 1.General rules and test methods for steady-state flow;
---Part 2.Alternative test methods;
--- Part 3.Calculation method of system steady-state flow characteristics.
This part is Part 3 of GB/T 14513.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
The translation method used in this section is equivalent to ISO 6358-3.2014 "Determination of flow characteristics of compressible fluid components for pneumatic use.
Part. Calculation method of system steady-state flow characteristics".
The Chinese documents that have a consistent correspondence with the normatively cited international documents in this section are as follows.
---GB/T 17446-2012 Glossary of fluid transmission systems and components (ISO 5598.2008, IDT)
This part is proposed by China Machinery Industry Federation.
This part is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee (SAC/TC3).
This section was drafted by. Bailing Pneumatic Technology Co., Ltd., Beijing University of Aeronautics and Astronautics, National Pneumatic Product Quality Supervision and Inspection Center, Zhejiang
Jiangyiri Pneumatic Technology Co., Ltd., Ningbo Jiaerling Pneumatic Machinery Co., Ltd., Zhongke Standard (Beijing) Technology Co., Ltd., Ningbo Sono Engineering
Industry Automation Equipment Co., Ltd.
The main drafters of this section. Shi Yan, Wang Shengping, Jiao Zhongliang, Xu Weiqing, Ren Zhisheng, Ren Cheli, Shan Junbo, Gao Yanling, Mao Xinqiang.
Introduction
In pneumatic systems, power is transmitted and controlled by compressed air in a closed loop. The components that make up the circuit have a solid
Some resistances, therefore, need to define and determine their flow characteristics to describe their performance.
ISO 6358.1989 is based on the contraction nozzle model and is used to determine the flow characteristics of pneumatic valves. The method includes two features
Characteristic parameters. sonic conductance C and critical pressure ratio b, which are used in the calculation of the recommended numerical approximation of flow characteristics. The method is based on static pressure testing
The results describe the flow characteristics of pneumatic valves, ranging from congestion to subsonic flow. GB/T 14513.1-2017 considers the gas flow
The effect of dynamic speed on pressure measurement uses stagnation pressure to replace the original static pressure.
Experience shows that many pneumatic valves with contraction-expansion characteristics do not fit well with the ISO 6358.1989 model. this
In addition, pneumatic components other than pneumatic valves also need to apply this method. However, for congested flow and subsonic flow regions, it is now necessary to use
Four parameters (C, b, m and Δpc) are used to define the flow characteristics.
This section uses a set of four flow characteristic parameters obtained from the test results. These parameters are described in order of decreasing priority
as follows.
---Sonic velocity conductance C is the most important parameter, which corresponds to the maximum flow rate (choked flow). This parameter is determined by the upstream stagnation condition.
- The critical back pressure ratio b, which represents the boundary between congestion flow and subsonic flow, is the second most important parameter. Its definition is different
The definition of the critical pressure ratio in ISO 6358.1989, which characterizes the ratio of downstream stagnation pressure to upstream stagnation pressure.
---Subsonic velocity index m, when necessary, can more accurately represent the characteristics of subsonic flow. For elements with fixed flow channels, m
The value is about 0.5.In this case, only two characteristic parameters C and b are needed. For other m with a large range
For components, the values of C, b, and m need to be determined.
---Δpc is the opening pressure. This parameter only applies to those pneumatic components that open with increasing upstream pressure, such as check valves and single valves
Directional valve.
In order to overcome the obvious violation of the compressible fluid theory, GB/T 14513.1-2017 made some changes to the test equipment. include
Increase the intake pressure measuring tube to meet the assumption that the inlet speed is ignored during the test and allow direct measurement of the inlet stagnation pressure.
Increase the outlet measuring tube to directly measure the downstream stagnation pressure to meet different pneumatic components. The difference between the upstream and downstream stagnation pressure of the element
Taste the loss of pressure energy.
In order to test components with a larger nominal diameter, as well as shorten the test time or reduce energy consumption, you can apply ISO 6358-2.2013
Specified methods, which include two alternative test methods. deflation test and inflation test.
This section specifies a method that uses simple numerical calculations, using the components and piping that make up the system without measurement
Flow characteristics to estimate the flow characteristics of the entire system. Normally, the flow characteristic parameters of the element are composed of Part 1 and Part 2
Certain; however, the flow characteristics of some components are not expressed according to the parameters defined in ISO 6358.This section has given the approximate equivalent flow
Math formula.
Pneumatic use of compressible fluid element flow
Characterization Part 3.System steady-state flow
Calculation method of characteristics
1 Scope
This part of GB/T 14513 specifies a method that uses simple numerical calculations.
The flow characteristics of traditional components and pipelines to estimate the flow characteristics of the entire system.
The formulas used in this section are used to describe the flow characteristics of compressed air through the element under subsonic flow and choked flow.
Note. The conductance of the tube, muffler and filter are affected by the inlet pressure, and their C and b values are only valid at the determined inlet pressure.
This section also applies to the calculation of equivalent flow characteristics of components not specified in GB/T 14513.
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 14513.1-2017 Determination of flow characteristics of compressible fluid components for pneumatic use Part 1.General of steady-state flow
Rules and test methods (ISO 6358-1.2013, IDT)
ISO 5598 Fluid Power Systems and Components Vocabulary (Fluidpowersystems and components-Vocabulary)
3 Terms and definitions
The terms and definitions defined in ISO 5598 and GB/T 14513.1-2017 apply to this document.
4 Symbols and units
The symbols and units used in this section shall comply with the provisions of GB/T 14513.1-2017 and Table 1.
Table 1 Symbols and units
Symbol description unit
bpipe Critical back pressure ratio for pipes or hoses-
Cpipe tube or hose sound velocity conductance m3/(s·Pa)(ANR)
d Inner diameter of pipe or hose m
L Length of pipe or hose m
λ Average friction factor of pipe or hose (depending on Reynolds number)-
ps2 Static pressure downstream of the pipe or hose Pa
T Absolute stagnation temperature K
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 14513.3-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 14513.3-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 14513.3-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 14513.3-2020_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+ countriesQuestion 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 [email protected]. 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.
|