Selection of orifice flowmeter | Selection of orifice flowmeter

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1. Common types and pressure measurement methods of orifice flow meters

Changzhou Lingnaijian type and pressure measurement method of orifice flow meters

1. Common types of orifice flow meters Standard orifice plate Standard orifice plate is a type of standard throttling device with the most specifications, widely used in various fluid, especially gas flow measurement. The structure varies depending on the pressure, diameter, and pressure measurement method. According to commonly used pressure measurement methods, it can be divided into three types: corner joint pressure measurement, flange pressure measurement, and radial distance pressure measurement. However, standard orifice plates are prone to fouling and abrasion during application, which may cause changes in the coefficient of medium outflow and result in certain measurement errors. Circular perforated plates are suitable for media with high viscosity and relatively dirty conditions. The pressure tapping method is usually flange tapping. Eccentric orifice plates are suitable for flow measurement of fluid containing solid particles. The pressure tapping method is corner tapping. Eccentric orifice plates and circular orifice plates are only suitable for installation on horizontal or inclined pipelines and cannot be used on vertical pipelines. The built-in orifice plate integrates the orifice plate with the measuring tube and is generally used for small diameters (DN ≤ 50mm), hence it is also known as a small diameter orifice plate. The flow restriction orifice plate is used for pressure reduction and flow restriction in the process of fluid transportation. Li Wangxi uses the pressure loss characteristics of throttling components to achieve the purpo

2. The pressure tapping method of orifice flowmeter is divided into two forms: separate drilling pressure tapping port and ring chamber pressure tapping. The ring chamber structure is cumbersome, time-consuming, material intensive, and costly to process, and the pressure holes are prone to blockage and difficult to handle. But using a ring chamber structure can improve measurement accuracy by utilizing its pressure equalization effect. The pressure tap can be located on the pipeline, pipeline flange, or clamping ring. The distance between the axis of the pressure tap and the corresponding end face of the orifice plate is equal to half the diameter of the pressure tap or half the width of the pressure tap ring gap. (Note: This figure shows a form of corner joint pressure tapping, the specific structure may vary due to practical applications) Flange pressure tapping sets the pressure tapping port on the front and rear dedicated pressure tapping flanges, and the distance between the pressure tapping port and the end face of the orifice plate is 25.4mm, also known as the one inch pressure tapping method. The flange pressure tapping structure is simpler than corner joints and ring chambers, but requires a dedicated orifice flange and cannot be replaced by a regular flange. The radial pressure tapping is s

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