The error of the orifice meter scale production and the correction method

Abstract: the error of the orifice meter scale production and the correction method of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Orifice flowmeter measurement error causes and elimination methods: in a nutshell, measurement error is mainly caused by: 1 installation specification, 2, 3 process system maintenance time wrong operation or condition changes caused by three reasons for this. 1. 1. 。 Orifice plate installed is not standard though. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the error of the orifice meter scale production and the correction method of the article details. Orifice flowmeter measurement error causes and elimination methods: in a nutshell, measurement error is mainly caused by: 1 installation specification, 2, 3 process system maintenance time wrong operation or condition changes caused by three reasons for this. 1. 1. 。 Orifice plate installation irregularities while standard orifice throttling device design calculation is concluded through experiment, don't need the actual calibration can be put into use directly, but during the installation process is not possible, the following specification even errors, which may lead to a measurement error. Standard orifice plate surface of upstream and downstream of the reverse loading: before installation, should correctly identify the direction of the flow direction of medium in pipeline and the orifice, otherwise will lead to the measured value is low. This is because the workers' carelessness, eliminate way is when installing a orifice plate, make it says on the orifice plate. 。 +。 。 The surface at the upstream side of flow. 。 。 Different orifice plate is installed wrong location: particularly prone to this kind of situation in commissioning phase. In the trial stage, the process piping to scavenging for many times, frequent disassembling orifice. If the orifice size, slightly do not pay attention to errors will occur and change the orifice plate can be back to normal. Orifice plate piece of upstream and downstream surface damaged or orifice flange gaskets protruding pipe: in the transport orifice or construction personnel in the process of the orifice plate installation, easy to cause surface damage or a convex flange gasket pipe upstream and downstream, resulting in measurement errors. Elimination method is to improve the technical quality of the construction personnel and sense of responsibility. Construction personnel in the inspection hole carefully before install the orifice plate, if discover the orifice plate piece of upstream and downstream surface is damaged, should be replaced in a timely manner; The installation should avoid to damage the hole in the process of orifice plate; When installing the flange gasket, want to make the center line of the flange gasket and the center line of the pipeline. Straight pipe before and after the orifice plate is not in conformity with the requirements: the role of the straight pipe before and after the orifice plate is in order to guarantee the stability of the flow of the fluid in the pipeline, but often turn on due to the process piping, bifurcate, meet resistance, make the fluid from stable disturbance, resulting in measurement errors. Elimination method is in accordance with the requirements for the straight pipe before and after, reasonable design of the installation position of the throttle device. 2. 。 Differential pressure transmitter is not standard differential pressure transmitter installation bad environment, such as vibration, dust or has a strong corrosive medium. Elimination method is in accordance with the relevant technical regulations, choose suitable location to install the transmitter; If must be installed under the environment of special circumstances, should be in accordance with the actual situation to increase the protective measures, such as adding protective box or fixed bracket. 3. 。 Install non-standard pipeline role is mainly used to pass the pipeline orifice differential pressure. Installation is not standard cause pipeline pressure differential pressure transmitter, generate additional error, resulting in a measurement error. According to the relevant provisions of the general technology of laying pipe length should be between 3 ~ 50 m. Too short, pipeline flow measuring volatility; ; Too long, are produced by measuring hysteresis. When measuring the liquid flow, should guarantee the pipeline laying horizontal one. 。 12 grade, make the pipe full of liquid, lest produce measurement error. Elimination method is in accordance with the technical regulations and design and construction. In the measurement of steam flow, Chiang kai-shek pipeline suction side condensate can take high pressure end range. This kind of situation will produce additional static error. Elimination method for the correct installation condensing tank, to ensure the high pressure end. When designing way of selecting pressure pipeline, according to the measured medium is liquid, gas or steam is different, must be in accordance with the relevant principles of design. Besides should pay attention to in the direction of the pressure, still should according to the actual situation to increase gas collector, settler or condenser [ 6] 。 4. 。 Blockage or pipeline leakage measuring viscous crystallizable media, often due to reasons such as thermal conductivity, pressure pipe cut-off valve plug, the input to change the differential value of the differential pressure transmitter, measurement error is produced. Eliminate way is checking on time, opening up pollution clean or with the hand pump. When measuring high pressure or corrosive medium, often there will be a guide pipe or joint leak, cause loss of pressure, differential pressure deviation. Eliminate way is checking on time, plugging holes.

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