For RTJ flanges , the plate is fixed on the plate holder. Download the datasheet. You want to get a quote, please click on the link and fill in the form. Note that our prices are digressive according to quantities. For more information or any specific request, please contact our services.
Design and sizing of restriction orifice may require review by specialist for stress and noise related evaluation. Though no internationally reputed codes and standards exist which directly address a restriction orifice but there are associated references and some are listed below:. Here is a description of a few common type of restriction orifice plate device used in Oil and Gas applications.
A single stage restriction orifice is usually a plate or a block with a bore orifice sized to the intended permanent loss of pressure. It is installed between the pipe flanges. Usually it is not a thin orifice plate; it is a thick orifice plate. Figure 1 Single stage Restriction Orifice Plate. A single stage multi-hole restriction orifice plate is used to abate the noise generated by the device due to high velocity through the bore which offers restriction to the incoming fluid.
The flow at the inlet is now channeled into several streams through the multiple holes and this reduces the noise which would be otherwise will be above the acceptable limit if a single hole device is used.
These devices are used where the pressure reduction ratio is very high and cannot be achieved by a single stage orifice plate. Additionally, restriction orifices, abbreviated " RO ", are often exposed to severe flow conditions associated with large pressure reductions and the related fluid conditions caused by liquids flashing to a gas, cavitation, and sonic choked flow.
In torturous applications, mimicking the design of measurement orifices is not sufficient. Orifice Plates are normally mounted between a set of Orifice Flanges and are installed in a straight run of smooth pipe to avoid disturbance of flow patterns from fittings and Valves.
For the common square edge concentric bore orifice, the bore and bevel is the standard method of limiting the plate edge thickness. Unless otherwise specified, plates will be beveled to the current accepted standards.
The quadrant edge bore is an orifice with the inlet edge rounded. Instead of beveling, the plate is counterbored to the desired edge thickness.
Thickness at the throat is equal to the radius. This bore is specifically designed for viscous fluids such as heavy crudes, syrups, and slurries with Reynolds Numbers below , Eccentrically bored orifice plates are plates with the orifice off-center, or eccentric, as opposed to concentric. Eccentric orifice plates are used in many industries including heavy and light chemicals, steel, paper, nuclear and petrochemicals.
Out of these, venturimeter is found to be the most accurate device for measurement of mass flow rate. Then we have to calculate the flow range of the orifice plate…. The plate thickness at the orifice edge should not be exceeded by any of the following parameters:. An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow in the latter two cases it is often called a restriction plate.
Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate. An orifice tab is welded on the orifice plate which extends outer of the line giving an indication of the orifice plate. Calculate cavitation index, Kd by equation 15 , and compare with minimum allowable value. This phenomena is well known as cavitation. One way to avoid cavitation in restriction orifice is to reduce pressure drop across RO so that the pressure dip is maintained as high as possible.
This results multiple restriction orifices to break the pressure drop in several steps. An Orifice Plate is used to measure flow, while a Restriction Orifice is used to drop upstream pressure of a system. It is similar to an orifice plate but is thicker. While passing the fluid through thick plate energy is lost in friction and heat resulting considerable pressure drop. An orifice is an opening or a hole, most often in the body, such as your mouth or your nostril.
We most often use orifice to describe a natural opening in our bodies, but it can an opening into any cavity, such as a hollowed out tree trunk, or the vent of a heating system. The amount of beveling required on plates of the same thickness decreases as the meter tube inside diameter ID increases.
0コメント