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　　Calculating the special requirements of orifice flowmeter,Xi'an Huaheng Instrument will introduce to you:the orifice flowmeter designed,manufactured and calibrated according to the national standard does not need real-flow calibration,has high accuracy,simple structure and low manufacturing cost,but the pressure loss is the largest in all standard throttling devices,and is not suitable for situations requiring small pressure loss.The standard orifice plate is widely used in petroleum and chemical industry.Industry,metallurgy,electricity and other industries.

 

 

　　生產(chǎn)節(jié)流裝置廠商都知道，在對(duì)孔板流量計(jì)和V錐流量計(jì)等節(jié)流裝置根據(jù)現(xiàn)場參數(shù)計(jì)算開孔直徑的時(shí)候，會(huì)涉及到這么一個(gè)問題，就是差壓變送器的最大差壓值如何選取的問題？差壓值如何選取，該選多大的？和很多因素有關(guān)，比如：不確定度，前后直管段等，所以說在計(jì)算孔板流量計(jì)和V錐流量計(jì)的開孔直徑時(shí)，千萬不能盲目的選取大的差壓，而要綜合考慮一些相關(guān)因素。

 

　　Manufacturers of throttling devices know that when calculating the diameter of orifice according to field parameters,such as orifice plate flowmeter and V-cone flowmeter,it will involve such a problem as how to select the maximum differential pressure of differential pressure transmitter.How to choose the differential pressure value and how large should it be?It is related to many factors,such as uncertainty,front and back straight pipe sections,etc.Therefore,when calculating the diameter of orifice plate flowmeter and V-cone flowmeter,we must not blindly select large differential pressure,but consider some related factors synthetically.

 

　　1、以上基本介紹的是選取差壓大的優(yōu)點(diǎn)，不過發(fā)展到了一定程度，必將相對(duì)的帶來一些弊端。熟悉孔板流量計(jì)和V錐流量計(jì)加工工藝的人應(yīng)該知道，當(dāng)差壓選取過大的時(shí)候，那么導(dǎo)致的直接后果就是開孔變的很小，那么相對(duì)的就是壓力損失也很大，孔板流量計(jì)本來壓力損失就很大，如果再加上這個(gè)的話，那么對(duì)整個(gè)工藝系統(tǒng)來說，由于這個(gè)壓力損失而造成的費(fèi)用是相當(dāng)可觀的；V錐流量計(jì)相比起來，稍微適中點(diǎn)。

 

　　1.The above basic introduction is to select the advantages of high differential pressure,but to a certain extent,it will bring some relative disadvantages.People familiar with orifice flowmeter and V-cone flowmeter processing technology should know that when the differential pressure is too large,the direct consequence is that the opening becomes very small,then the relative pressure loss is also very large,orifice flowmeter original pressure loss is very large,if this is added,then for the entire process system,the pressure loss caused by this pressure loss.The cost is considerable;the V-cone flowmeter is slightly moderate in comparison.

 

　　2、差壓值大時(shí)，β值變小，推薦使用的最小雷諾數(shù)較小。這樣的話，使得實(shí)際雷諾數(shù)有可能遠(yuǎn)大于推薦使用的雷諾數(shù)，于是流量系數(shù)趨于穩(wěn)定，測量精度也就提高。

 

　　2.When the differential pressure is large,the beta value decreases and the minimum Reynolds number recommended is small.In this way,the actual Reynolds number may be much larger than the recommended Reynolds number,so the flow coefficient tends to be stable and the measurement accuracy will be improved.

 

　　3、而對(duì)于差壓變送器來說，差壓大的比差壓小的更加穩(wěn)定。

 

　　3.For the differential pressure transmitter,the higher the differential pressure is,the more stable the lower the differential pressure is.

 

　　4、差壓值大時(shí)，所需要的最小直管段可以短些。

 

　　4.When the differential pressure is large,the minimum straight pipe section needed can be shorter.

 

　　針對(duì)這個(gè)特點(diǎn)，對(duì)于一體化孔板流量計(jì)說，考慮各方面經(jīng)濟(jì)的因素，應(yīng)該選取差壓最大的那個(gè)開孔值；而V錐流量計(jì)則相對(duì)好點(diǎn)了，對(duì)于現(xiàn)場流體是牛頓流體的話，本身V錐流量計(jì)的直管段要求就比較低，即使短些的話，相比而言的話，也不存在了。

 

　　In view of this characteristic,for the integrated orifice plate flowmeter,considering various economic factors,we should choose the opening value with the greatest differential pressure;for the V-cone flowmeter,it is relatively better.For the field fluid is Newtonian fluid,the straight pipe section of the V-cone flowmeter itself is relatively low,even if it is shorter,it does not exist in comparison.

 

PS:天津壓力變送器是什么，計(jì)算孔板流量計(jì)的特殊要求！

PS:What is Tianjin pressure transmitter? Special requirements for orifice flowmeter calculation!