The classification and advantages and characteristics of the standard throttling devices of SIKE systems in henan province
Henan SIKE measurement and control technology co., LTD., production standard throttle device is IS05167 and ISO9300 according to international standard, national standard GB/T2624-2006 technical conditions stipulated in the design, manufacture and use of the throttle device, without having to wet the flow coefficient and error can be determined. Now qualified in the closed pipe are: standard orifice, standard nozzle, standard venturi tube, standard bull, standard sonic nozzle, standard sonic nozzle, etc. There are: standard weir, triangular weir, rectangular weir, and wide roof weir. Generally, the process of designing, manufacturing, installing and using wet marks can be completed according to standard technical conditions.
The following conditions must be met:
1, determine the applicable scope, including medium, geometry size and flow conditions, fluid mechanics parameters (Reynolds number, viscosity, pressure, temperature, etc.), the thermodynamic parameters (property and state), the installation conditions, data acquisition mode and method of use;
2. Determined mathematical model, including flow formula and calculation of relationship coefficients, especially the calculation of flow coefficient;
3. Definite geometry conditions, pipeline diameter (closed pipe); Channel width (open channel);
4. Determine the installation conditions and affect the conditions of the flow on the site;
5. Calculated uncertainty calculation, the calculation of the uncertainty of the attachment (if necessary);
6. Determine the verification cycle to meet the time conditions of the performance of the flowmeter;
7. Do not need a wet mark to achieve the performance of the flowmeter.
Advantages:
1. The biggest advantage is that the economy is good, without the wet mark, it can save a lot of cost of verification.
2. Convenient design, manufacturing, installation and use, technical problems can be solved at any time by technical standards without causing differences;
3. Mature technology, easy to popularize, easy to master and easy to use;
4. Stable and reliable;
5. Simple structure, no moving parts, long working life;
6. Applicable to various media, including liquid, gas, vapor and polyphase;
7. Applicable to all sizes (within the standard range);
8. Applicable pressure and temperature are the highest in various flowmeters;
9. Has a long history and has the most comprehensive test data; The most thorough theoretical research; Maximum practical experience;
10. There are international standards and national standards.
Its characteristics are listed as follows:
1. Detailed the structure and technical requirements of throttling devices in the standard; The calculation formula of outflow coefficient and expansibility coefficient, application conditions and uncertainty calculation formula, etc. Calculation formula of pressure loss; Field use: the conditions of pulse valve value, restrain the full development of pipe flow measures, such as the length of the straight section of rules necessary to measure the flow adjustment and installation requirements of throttling and application of materials listed in the standard is the basic data of standard throttle device is applied, in full flow measurement standards is the most complete and mature.
2, standard throttle device has a wealth of information about deviates from the standard modification, such as AGA3 number listed in the bibliography information and ISO9300, international information on standard throttle device actually far more than these, we call these data standard throttle device of soft power, the national traffic monitoring standard throttling device in a soft power is second to none.
3, standard throttling device of experimental data is carried out all over the world, the reliability and credibility of data and completed by individual manufacturer or scientific research group is the only can not match, have complete whole society can ensure reliable without deviation system. Each oil measurement standards manual API5.7 "differential pressure flowmeter test agreement" with RG formula specified in the flow coefficient of the orifice plate test piece is flow standard device dynamic tracing value standard, in need of reliable orifice plate detection in the measurement of flow measurement value will play an important role.
4, in the standard throttle device focused throttling device of maturity is not the same, nozzle and venturi tube profile the throttle device is less than orifice, but profile has more advantages than orifice throttling device, such as loss of pressure is small, the flow measurement has good stability, applicable cleaning fluid, etc. This year, the application of these profile throttling devices has been taken seriously. Their potential USES are far from being used, and they are currently recommended in high temperature and high pressure steam measurement and miscible fluid measurement.
5,The flow in the venturi nozzle (commonly known as sonic nozzle) had a surge in recent years, application and experimental study on the formation, he was recognized as transfer standard of choice for gas flow measurement, ISO9300 new standards (2005 edition) to broaden its range of application, mainly is the low Reynolds number region, it can meet the requirement of city gas need transfer standard gas measurement. The other high standard factor nozzles can increase the gas flow measurement to a new height.