The installation of the orifice meter scale and measurement error analysis

Abstract: the installation of orifice meter scale and measurement error analysis information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 。 Throttling element ( Standard orifice) The straight pipe before and after the installation of the throttling articles must be straight, bend shall not be visible to the naked eye. Throttling requires a enough long straight pipe before and after, should be in accordance with the national standard GBT2624 - 2006 with installed in a circular cross section differential pressure in the pipeline. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the installation of the orifice meter scale and measurement error analysis for details. 。 Throttling element ( Standard orifice) The straight pipe before and after the installation of the throttling articles must be straight, bend shall not be visible to the naked eye. Throttling requires a enough long straight pipe before and after, should be in accordance with the national standard GBT2624 - 2006 with installed in circular cross section of the differential gear measurement of fluid flow in full tube processing is zui is reasonable. But in actual engineering people often carried out in accordance with the top 10 d to 5 d after installation. Medium is gas, take partial pressure mouth set in a horizontal line should be 45 & deg; Position, so that the condensation crossing into the pressure tube. For high viscosity or corrosive medium, to retrofit isolator, through spacer pass differential pressure signal to transmitter. In liquid medium, guide should install gas collector pressure pipe zui highs. 2. The installation of the differential pressure transmitter take pressure points should guarantee a straight pipe, each side is greater than 5 d ( Pipe straight through) 。 Took the pressure on the steam pipe, pressure pipe, should be installed at the side of the pipe balance tank shall be installed in the lead, zui the high point of the pressure pipe drainage pipe shall be installed near the transmitter led pressure pipe joint. Take pressure points and the transmitter pipe distance should be more than 1 meter, transmitter installation position should be lower than take pressure point position. 3. Orifice flowmeter in use orifice meter measuring error analysis in practical application, if use undeserved, can make its measuring error increases, sometimes can reach about 10%. How to reduce the measurement error, need reasonable selection and accurate design calculation and processing manufacturing, more attention should be paid to the correct installation, maintenance, and conform to the conditions of use, such as to guarantee the actual measurement orifice meter has enough precision. The following is the analysis of measure error: ( 1) Flow calculation equation to describe the truthfulness of the flow state of uncertainty, as well as the pulsating flow, multiphase flow, vortex flow, asymmetric flow do not conform to the prescribed standards, such as if still in accordance with the original instrument constants calculated flow, the error with the actual flow, can be in accordance with the relevant calculation formula of modified or redesigned. （ 2) Measuring devices ( Such as components, secondary instrument, calculation and output devices, etc. ) Under the premise that satisfy the requirements of the standard, because the device itself and environment condition factors of uncertainty. 1) orifice plate installation is not correct. Orifice plate when installation hole center is different from the center line of the pipeline, will cause the measuring error, protruding objects such as pressure pipe blockage and gasket, is also a cause of this error. (2) the edge of the orifice inlet wear. Despite the standard orifice ISO5167 listed in the international standards and national standards GB2624 in our country, but it has its inherent weaknesses in the structure, it is in actual use are not durable. Period for the use of an orifice plate is ten years or more, but only 4 to 5 months after the installation of commissioning, the entrance to the edge of the sharp degree have been destroyed. In use, due to the effect of abrasion of the fluid, especially for high pressure, fluid or high velocity particles and high temperature steam, and so on, it will be faster to dull the edge of entrance, be ground into a round opening edge. The result is: under the same flow rate, fluid contraction was less, after the orifice differential pressure lowering, will form the growing negative flow error. The orifice exit flow beam zui small cross-sectional area after the entrance is abrasion has increased, if under the condition of calibration, nature will find the orifice flow coefficient has been increased, but is still used in use according to the standard formula calculated smaller coefficient, so there will be a growing negative systematic error. (3) scale on the surface of the orifice and circulation changes in the cross-sectional area. Because of throttling orifice flowmeter, use for a long time, dirty sewage will accumulate, upstream of the orifice differential pressure signal, directly affect the measuring accuracy. Dirt and orifice passivation can cause measuring deviation of 2 ~ 10% above. If measured medium is dirty, Containing tar) , before and after the orifice pressure ring room blocked, the pressure of the pressure change or no differential pressure, flow meter cannot work normally, can cause larger error of measurement or no flow display. （ 3) The uncertain factors of actual measured medium properties, such as component changes and error, sampling, analysis and the actual physical changes affect the normal work of the instrument and so on convection uncertainty of the value. （ 4) Zero drift and range Settings in the transmitter can also cause measurement error.

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