Gas flow meter scale method

Abstract: the amount of gas flow meter scale method information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. In the process of commodity trading without an important parameter of the amount of goods, natural gas as a commodity trading markets also cannot leave the quantity of goods. Need through the instrument measuring the size of the volume of gas, then its value is converted into money. If you don't know the natural. More flow meter manufacturers choose model price quote you are welcome to inquire, the article details below is gas flow meter scale quantity method. In the process of commodity trading without an important parameters & ndash; — — The quantity of goods, natural gas as a commodity trading markets also cannot leave the quantity of goods. Need through the instrument measuring the size of the volume of gas, then its value is converted into money. If you don't know the amount of gas can't to settle trade. Therefore there is no gas accurate measurement cannot be carried out as normal and commodity trading live metering of natural gas market involves many aspects of departments of national economy and people's life, is an important technical foundation of the national economy. The basic characteristics of measurement is a measure, but the measuring tool is not a product of the general, but has the uniformity, accuracy and a certain level of accuracy of measuring instruments, on the technology and management requirements of the legal system, measurement and higher than general measure. Metrological verification is carried out in accordance with the national metrological verification system tables dissemination process. Dissemination value was repetition will metrology units, through the metrological verification is passed to the next level of measurement standard, and work step by step in order to measuring instruments, zui final purpose is to guarantee the accuracy of the measured object is the value of the agreement. Measuring instruments through statutory metrological verification institutions after the table according to the national metrological verification system for metrological verification, can be traced back to the national standards of measurement, ensure accurate and reliable of the value. All law 'provisions of the state for compulsory verification of measuring instruments, are appointed by the metrological administrative department of the people's governments at or above the county level of the legal metrology institutions or authorized metrological verification institutions for which a fixed, regular check, namely strong measuring instruments users by the regulation overhaul period inspection to designated statutory metrological verification institutions or authorized metrological verification institutions entrusted for verification. Natural gas measurement is often expressed as a volume in our country, the legal units is m3. Gas is along with the temperature and pressure of gas volume change. For comparison, must provide a state as the standard. Regulations in our country is the status of the gas flow metering standards: absolute pressure of 0. 101325 mpa, the temperature is 293. 15K。 If there is no specified for the working status of gas flow rate, generally refers to under the standard condition of gas volume flow. Natural gas flow metering method are many, the available flow meter is very much also, according to the working principle of the roughly divided into the following three: 1) Differential pressure flowmeter: in the current measurement pipeline gas, more than 95% are still using the standard orifice differential pressure flowmeter, by indirect measurement through the standard orifice gas parameters such as pressure, differential pressure and temperature, according to the empirical formula to calculate the gas volume flow. Secondary instrument used to measure the amount of indirect, requires records or integrating function, so the differential pressure flow rate measurement system is roughly divided into two categories, namely, the CW dual bellows differential pressure, absolute pressure recorder ( With a glass rod thermometer) And computer automatic measuring system. Because of the standard orifice plate for each ( 2 ~ 3) Month need cleaning and verification once, orifice plate from the pipeline pressure device handling more frequently, in order not to affect the gas, take good zui pressure device adopts advanced orifice valve, straight pipe before and after to keep roughness not overweight, zui good anticorrosive processing, because these parts once installed, as long as no damage to the general no longer remove. 2) Volumetric flowmeter: also called gas lobed rotor meter, the roots flowmeter, it is a kind of typical displacement meter, usually for continuous measuring the amount of gas flowing through a pipe, The cumulative flow) 。 Its principle is between rotor and shell constitute a closed room, measuring room. Waist round rotor flowmeter is a pair of mutual conjugate curve of the waist wheel. With the waist wheel drive gear coaxial installation. When the current flow through timing, import and export form between differential pressure and promote the waist wheel rotation, waist round between the drive gear drive with each other. Waist wheel turn every week, discharge flow is a fixed value, the output is proportional to the waist wheel shaft revolutions. Therefore, as long as the known waist wheel and flowmeter shell of metering chamber volume, waist wheel rotation number, the volume of a gas flow rate can be calculated. Measure the waist wheel speed, can draw a flow per unit time, or an average of the instantaneous flow rate. The indications of the volumetric flowmeter is commonly the volume flow, under the condition of conversion to standard state using artificial calculation, temperature and pressure with long-term average or estimated values. 3) Speed meter, is a direct measurement in a closed pipe full pipe flow velocity for the principle of the flowmeter. Including the turbine flowmeter, vortex flowmeter and vortex precession flowmeter, ultrasonic flowmeter, etc. Due to the measured velocity is, in the cases of zui also showed after volume flow conditions. Now in the market have appeared in the real-time compensation of temperature and pressure using computer automatic intelligent vortex precession flowmeter.

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