| 天津压力变送器是什么，计算孔板流量计的特殊要求！ |
| 信息来源： 压力变送器 | 2019-05-18 点击量： 9253 |
计算孔板流量计的特殊要求，西安华恒仪表为您介绍：孔板流量计按国标规定进行设计、制造和检定的标准孔板无需实流标定，精度高、结构简单、制造成本低，但压力损失在所有标准节流装置中最大，不适用于要求压力损失小的情况，标准孔板广泛用于石油、化工、冶金、电力等行业。
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.
生产节流装置厂商都知道，在对孔板流量计和V锥流量计等节流装置根据现场参数计算开孔直径的时候，会涉及到这么一个问题，就是差压变送器的最大差压值如何选取的问题？差压值如何选取，该选多大的？和很多因素有关，比如：不确定度，前后直管段等，所以说在计算孔板流量计和V锥流量计的开孔直径时，千万不能盲目的选取大的差压，而要综合考虑一些相关因素。
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、以上基本介绍的是选取差压大的优点，不过发展到了一定程度，必将相对的带来一些弊端。熟悉孔板流量计和V锥流量计加工工艺的人应该知道，当差压选取过大的时候，那么导致的直接后果就是开孔变的很小，那么相对的就是压力损失也很大，孔板流量计本来压力损失就很大，如果再加上这个的话，那么对整个工艺系统来说，由于这个压力损失而造成的费用是相当可观的；V锥流量计相比起来，稍微适中点。
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、差压值大时，β值变小，推荐使用的最小雷诺数较小。这样的话，使得实际雷诺数有可能远大于推荐使用的雷诺数，于是流量系数趋于稳定，测量精度也就提高。
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、而对于差压变送器来说，差压大的比差压小的更加稳定。
3.For the differential pressure transmitter,the higher the differential pressure is,the more stable the lower the differential pressure is.
4、差压值大时，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.
针对这个特点，对于一体化孔板流量计说，考虑各方面经济的因素，应该选取差压最大的那个开孔值；而V锥流量计则相对好点了，对于现场流体是牛顿流体的话，本身V锥流量计的直管段要求就比较低，即使短些的话，相比而言的话，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:天津压力变送器是什么，计算孔板流量计的特殊要求！
PS:What is Tianjin pressure transmitter? Special requirements for orifice flowmeter calculation!
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