What are the main types of built-in orifice flow meters?

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1. Piping Regulations for Flowmeters

Piping Regulations for Flowmeters: Flowmeters are used in petrochemical plants to measure the flow of fluid in pipelines, and their piping design must comply with the following regulations:

1. General Provisions This regulation applies to the installation design of flow meters for measuring fluid flow in pipelines in petrochemical plants. Including the installation design of differential pressure flow meters (orifice plate, nozzle, Venturi tube, internal orifice plate type), volumetric flow meters (elliptical gear), area flow meters (rotor flow meters), turbine flow meters (gas turbine, liquid turbine), and vortex street flow meters (compensating type, pressure type, differential pressure vortex street). In addition to complying with this regulation, the piping design of flow meters must also comply with relevant piping material grade design regulations.

2. Installation position of piping for differential pressure flowmeter: Orifice plate, nozzle, Venturi tube, internal orifice plate and other throttling devices should be installed on horizontal pipelines. If vertical installation is required, it needs to be confirmed by the self-control professional.

. The length of the straight pipe section: The length of the upstream and downstream sections of the throttling device should meet the requirements of the self-control conditions. When self-control conditions are not available, piping can be carried out according to the reserved length table, and data outside parentheses should be used as much as possible to ensure zero measurement error. If necessary, data inside parentheses can be used, and the measurement error is ± 0.5%. Pressure tapping position: Horizonta Concealed orifice flowmeter

l or inclined pipeline: The pressure tapping position should avoid gas (for liquid measurement) or liquid and dirt (for gas measurement) in the measured fluid from entering the pressure conduit. Vertical pipeline: The position of the pressure tapping port can be arbitrarily selected on the plane of the pressure tapping device, but the two pressure tapping ports need to be in the same orientation. When the measured fluid is a liquid, the flow direction should be from bottom to top; When it is a gas, the flow direction can be arbitrary; When it is steam, the flow direction should be from top to bottom. Special orifice plate: Circular orifice plate: Only suitable for horizontal or inclined pipelines (for dirty liquids), the orientation of the pressure port is determined based on the value of m (m=f/F, where f is the opening area of the circular orifice plate and F is the cross-sectional area of the pipeline). Eccentric orifice plate: only applicable to horizontal pipelines, the eccentric inner circle is tangent to the circle formed by 0.98D20 (D20 is the inner diameter of the pipeline). When the medium contains a liquid containing gas, the tangent point is located at the top of the vertical centerline of the pipeline; When a gas or liquid contains solid particles, the tangent point is located at the bottom of the vertical centerline of the pipeline. Other requirements: The orientation of the pressure pipe should consider the space requirements for installing the orifice flange of the horizontal pipeline under the platform or floor slab. The installation position of the orifice plate should be close to the on-site instrument box, especially when the pressure pipe is made of special alloy steel. The orientation of the pressur

What are the main types of built-in orifice flow meters?

1. Piping Regulations for Flowmeters

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