Orifice plate hook up

The Orifice plate is differential pressure flow measurement device. When an orifice plate is placed in a pipeline carrying fluid, the orifice plate is installed perpendicular to the flow of the fluid to be measured. As all DP flowmeters, Orifice plate makes a restriction in the flow.

This restriction causes a pressure drop across the plate. This pressure drop is measured using a differential pressure sensor and when calibrated this pressure drop becomes a measure of flow rate. A differential pressure is generated across the orifice plate. The differential pressure sensor attached to upstream and downstream records the pressure difference between these two points which becomes an indication of the flow rate of the fluid through the pipe when calibrated.

A simple orifice meter attached to manometer is shown above. The differential pressure is transmitted to DP transmitters and the pressure difference is converted to flow rate. The flow rate is square root function of the pressure difference, Square root extractors are used to measure the flow rate. Options are available for unclean material or flows that contain liquid and gas of varying densities.

When measuring liquids the bore can be positioned at the top of the pipeline to allow the passage of gases. The same applies when allowing suspended solids to pass, by positioning the bore at the bottom and gaining a more accurate liquid flow measurement.

Half-circle bores are often used with light slurries or dirty gases. The pressure removal holes or slits are located in the aperture and mounting rings. The location of these pressure taps depends on the type of tap being used.

However, the taps are usually located in the adjacent flanges, or one diameter upstream and one-half diameter downstream. Types of Orifice plate: There are two main types of orifices for various applications: Concentric, square edged Eccentric or segmental square edged Concentric, square edged: This is the most common and basic type of orifice meter.

This device is typically a thin concentric sharp-edged orifice plate. Because of the simplicity, it is inexpensive to manufacture to very close tolerances. This also simplifies the ease in which it can be installed and replaced. This type of orifice plate is used to give increased stability in flow, and is about 10 times that for conventional plates Eccentric or segmental square edged: These are generally used when the process material contains foreign matter that may block the orifice in the case of a concentric configuration Advantages:


How do orifice plates work? An orifice plate installed in a line creates a pressure orifice plate thickness T is 3 mm, above DN, T is 6 mm. hcqn.tks are mm thick. hcqn.tk line sizes up to DN, carrier assembly thickness B is . Sep 10, The Orifice plate is differential pressure flow measurement device. An orifice is simply a smooth disc with a round, sharp-edged inflow aperture and mounting rings. Temperature measurement, hook up diagram,instrument data sheet,calibration procedure level transmitter,instrumentation engineers technique,unit .

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