Measuring Principle and Application of Orifice Flow Meter

Abstract: The measurement principle and application information of the orifice flowmeter are provided by the excellent flowmeter and flowmeter manufacturers. Orifice flowmeter working principle The fluid filled with the pipeline flows through the throttling device in the pipeline, causing local contraction near the throttling part, increasing the flow rate, and generating a static pressure difference between the upstream and downstream sides. Under the conditions of known relevant parameters, according to the original flow continuity. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the measurement principle and application details of the orifice flowmeter. The working principle of the orifice flowmeter The fluid filled with the pipeline flows through the throttling device in the pipeline, causing local contraction near the throttling part, increasing the flow rate, and generating a static pressure difference between its upstream and downstream sides. Under the condition of known relevant parameters, the relationship between differential pressure and flow rate can be derived according to the principle of flow continuity and Bernoulli equation to obtain flow rate. The basic formula is as follows: c - outflow coefficient dimensionless d - throttle orifice or throat diameter of the throttling piece under working conditions D - inner diameter of upstream pipeline under working conditions qm - mass flow Kg/sqv - volume flow m³/sß-Diameter ratio d/D Density Kg/m of dimensionless fluid³The expansion coefficient is dimensionless 4. The structure of the orifice flowmeter The throttling device is composed of throttling parts: standard orifice plate, standard nozzle, long diameter nozzle, 1/4 round orifice plate, double orifice plate, eccentric orifice plate, round hole Pressure-taking devices such as plate, conical inlet orifice plate: ring chamber, pressure-taking flange, clamping ring, pressure-guiding pipe and other connecting flanges (national standards, various standards and flanges of other design departments), fasteners . Scope of application of measuring tube throttling device and related technical indicators Throttling part name Applicable pipeline (DN mm) Applicable diameter ratio B (d/D) Application characteristics Outflow coefficient uncertainty Ec% Design standard angle connection Standard orifice ring chamber Formula 50－50050－500 0.2－0.750.2－0.75 Suitable for cleaning media Among them, GD structure is suitable for flow measurement under high temperature and high pressure conditions. 450-1000 (3000) 0.2-0.75 Flange pressure standard orifice plate 50-1000 0.2-0.75 Easy to remove dirt, suitable for various media 0.6-0.75 % ISO5167GB/T2624-93 Standard orifice plate for radial pressure taking 50-1000 0.2-0.75 Angle-connecting pressure taking standard nozzle (ISA1932 nozzle) 50-500 0.3-0.8 Small pressure loss, long life, especially suitable for steam flow measurement 0.8- 1.2% ISO5167GB/T2624-93 Long-diameter nozzle 50-630 0.2-0.8 Low pressure loss and long life, LGP type long-diameter nozzle assembly is suitable for high-parameter water and steam flow measurement 2.0% ISO5167GB/T2624-93 Classic Venturi tube machining type 100－800 0.2－0.8 The pressure loss is small, the required straight pipe section is smaller than the orifice plate and the nozzle 1.0% ISO5167GB/T2624－93 Rough welding iron plate type 200－1200 (2000) 0.4－0.7 1.5% Venturi nozzle 65－500 0.316－0.77 Same as above 1.2－1.75% ISO5167GB/T2624－93 1/4 round hole plate 25－150 0.245－0.6 Suitable for low Reynolds number 2.0－2.5% DIN BS conical inlet hole plate 25－250 0.1－0.316 Same as above 2.0% BS round cut Orifice plate 50－1500 0.32－0.8 It is suitable for the measurement of dirty, air bubbles or fluids containing solid particles. 1.5% DIN eccentric orifice plate 100-1000 0.46-0.84 1-2% ASME small orifice plate 12.5-40 0.2-0.75 Suitable for small pipeline flow measurement 0.75% ASME lens type orifice plate 12.5-150 0.2-0.75 Suitable for high pressure and low temperature Pipe flow measurement 0.6-0.75% ISO5167ASME end orifice plate greater than or equal to 15 0.2-0.62 1.5-2.0% double orifice plate 25-400 0.2-0.8 Suitable for large flow measurement orifice plate name, model, pressure taking method, nominal pipe diameter (mm ) Nominal pressure (MPa) Execution standard (structure) Standard orifice plate LGB fillet connection (pressure from ring chamber) 50～400 less than 10 GB2624K07 (blue chemical) DG LGB-Z fillet connection (drilling pressure) 400～2000 less than 1.6 LGB ring chamber (eight slots) 50～400 less than 32 Flow measurement manual LGB ring chamber (without flange welding) 50～275 less than 28.22 Flow measurement manual DG0711～0718 LGB-F flange pressure 50～800 less than 2.5 GB2624K06 (flange Chemical) LGB-F flange pressure 50～400 4.0～40 GB2624K06 (Lanhua) petrochemical LGB-J diameter pressure 50～760 less than 10 GB2624 standard nozzle LGP corner connection (ring chamber pressure) 50～400 less than 10 GB2624 Flow Measurement Manual LGP-Z Angle Connection (Pressure from Drilling) 400～500 Less than 1.6 LGP Ring Chamber (Eight Slots) 50～300 Less than 32 Flow Measurement Manual LGP Ring Chamber (High Pressure Lens Cushion Type) 15～150 Less than 32 LGP ring chamber (flangeless welding type)

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