Orifice plate assemblies with rtj holder the plate holder assembly is a combination of plate holder and an orifice plate designed for ring tongue joint rtj flanges. The top countries of suppliers are china, hong kong s. Orifice flanges feature pairs of pressure tappings which are machined directly into the orifice flange. Commonly used for flow measurement due to their simplicity, reliability, and easy installation. The plate id41tification can be read through the clear plastic bag. This has the advantage of dispensing with any orifice carriers or pressure tappings in the pipe wall. In the case of a sharpedged orifice, the effective diameter is 0. The point where the fluid flow profile constricts to a minimum crosssectional. Consists of onepiece ss orifice plates shaped to fit the contour of the union seat balltocone, eliminating the need for gaskets. In red you will find an orifice calculation, feel free to substitute this numbers with your own ones. Daniel orifice plates and plate sealing units december 2017 table 4. With established standards for manufacturing, macweld orifice plates perform reliably under the most challenging installation and process conditions. Line sizes 12 and above require the seal to be vulcanized to the o.
Emco restriction plates for insertion between raised face flanges are used to restrict the flow in order to prevent damage on pipe line equipment on the upstream side in blow down systems, or to limit the flow pressure to avoid damage on equipment on the downstream side. The shape of the orifice flow meter and orifice above restriction is a common form and in general there is a difference in the profile of the hole of the second orifice. Jan 02, 2016 a photograph of an integral orifice plate and transmitter is shown here,in an application measuring the flow of purified oxygen gas through a copper pipe. Finish of plate the upstream and downstream faces of the orifice plate to a diameter equal to d3 shall have a. Design guide for multistage restriction orifices ros plates with 1 hole and n 3 holes technical report march 2016 with 4,255 reads how we measure reads. Orifice information is stamped on the unique handle. The simplest design of orifice plate is the squareedged, concentric orifice. Orifice plates for flow measurement and flow restriction. Looking at a side view of a squareedged concentric orifice plate reveals sharp edges 90 o corners at the hole. The differential pressure across the orifice plate is proportional to the square of the fluid velocity. Emco restriction plate series irb1 for rf flanges intech2000. Upon close examination of the orifice plate, the edge appears to have more of a rounded than a sharp edge quality. The bore and counterbore is a special method to limit the plate edge thickness. Practical guidelines for specifying orifice fittings.
Fpd190 differential pressure restriction orifice plates. The orifice plate is also approved by many organizations for. When the velocity increases, the pressure decreases and vice versa. A restriction orifice plate is a device used to restrict flow. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. An orifice plate measures the flow of a liquid or gas by the difference in pressure from the upstream to the downstream.
The orifice plate is also approved by many organizations for custody transfer of liquids and gases. Finish of throat the throat and outlet cone shall have a surface roughness ra. Orifice plate, orifice flange model flcop, flcfl, flcac. The default calculation involves air passing through a mediumsized orifice in a 4. A wide variety of restriction orifice plate options are available to you, there are 61 suppliers who sells restriction orifice plate on, mainly located in asia.
Download the datasheet pdf orifice plate assemblies with rtj holder. Our innovative orifice plate line includes a complete selection from 12 through 6 size range in both eccentric and concentric drilled plates as well as a solid plate design. A single stage restriction orifice is usually a plate or a block with a bore orifice sized to the intended permanent loss of pressure. Orifice ports are accurately machin ed f or precision measur ements. Each daniel orifice plate is packaga3 in clear pob. The plate is similar to the type 500 orifice plate but has a 2in. Practical guidelines for specifying orifice fittings this white paper provides detailed information on how to correctly specify an orifice fitting to meet oil and gas application. The device is mainly used when the transfer of hydrocarbons from one entity to other entity has to take place. By continuing to use the site, you agree to our privacy and cookie policy. In other cases full penetration joint to be applied. The following is an excerpt from bob kellers paper on orifice meter errors, which he will present at the canadian school of hydrocarbon measurement event in calgary, alberta on march 28, 2012.
Restriction orifice model flcrost, singlestep restriction. This type of orifice plate is manufactured by machining a precise, straight hole in the middle of a thin metal plate. Orifice plates are typically sandwiched between two flanges of a pipe joint, allowing for easy installation and removal. Design guide for multistage restriction orifices ros. Each set of reversed plate tests consisted of a baseline and a reverse plate. Model fop orifices are widely used in a wide range of pipe sizes from. Considered the most common primary element, meriams concentric orifice plates are precision bored to exact dimensions with a sharp upstream edge to ensure accuracy. Dynamic behaviour of flow through multistage restricting. Paddle type orifice plates series 520 series 520 the paddle type orifice plate series 520 is designed for use between orfice flange unions. This is beneficial in order to reduce noise and protect downstream equipment. By default, the calculator will show an orifice plate calculation example. Platz are lightly stamped to the follcwing information 520 mat4iai line size rating. Corner tapstaps located at the face of the orifice plate normally used in the line sizes smaller than 2.
To calculate the flowrate of a fluid passing through an orifice plate, enter the parameters below. Of all the pressurebased flow elements in existence, the most common is the orifice plate. An orifice meter is a device used for measuring the rate of fluid flow. Tabs help to acknowledge that an orifice plate is in the line and are engraved to indicate the hole diameter. Dynamic behaviour of flow through multistage restricting orifices. The orifice plate is available in standard material such as ss316, ss304, ss316l, monel, hastelloyc, etc. The plate holder has a function of holding the orifice plate and also a function as a gasket to prevent leakage of the process fluid. This issimply a metal plate with a hole in the middle for fluid to flow through. It reduces flow and pressure from the upstream side to the downstream side. The restriction orifice plate is used to limit the mass flow in process engineering plants. My opinion has been that an orifice plate is a component in terms of ped. A wide variety of orifice plate price options are available to you, there are 254 suppliers who sells orifice plate price on, mainly located in asia. In the process chemical plants, restriction orifices, such as single hole orifice, multiperforated orifice and cone type orifice are used to restrict the flow in the piping system. We manufacture orifice plates, restriction orifice plates, with or without carrier ring, meter run assemblies, integral orifice plates to suit customers requirements.
Here is a description of a few common type of restriction orifice plate device used in oil and gas applications. For this type of restriction orifice plate the flow quantity through the orifice plate will vary with the pressure before and after the orifice plate. A common operating problem is orifice plates installed backwards. Each orifice plate has model number and orifice diameter stamped on tab for easy identification and selection. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. Model 951 orifice plates concentricsegmentaleccentric the most common primary flow element is the concentric orifice plate, often called the sharpedged orifice plate. Restriction orifice plates and critical flow devices. Universal type orifice plate the universal type orifi ce plate is designed to be used in an orifi ce fi tting. Orifice plate 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. The solution in these cases is to devide the delta pressure in several steps, avoiding all the issues has to be generated by these factors.
Emco restriction orifice plate type irb1 for rf flanges. Pair this up with an orifice flange to provide a convenient, accurate method for installing orifice plates. When a fluid whether liquid or gaseous passes through the orifice, its pressure builds up slightly upstream of the orifice. While the restriction orifice hole has a straight profile. The orifice plate flow meter is commonly used in clean liquid, gas, and steam services. Instead of beveling at the normal 45 angle, the plate is. It is available for all pipe sizes but it is very costeffective for measuring flows in larger ones over 6 diameter. Restriction orifice plates as the headline implies two main types of flow limitation exist. This handle is designed to facilitate storage of the plate without damage to the orifice bore. Welding of tab tab may be integral with orifice plate up to and including 7 mm plate thickness.
The line size, flange rating, orfice bore, and plate material is stamped on the handle. Restriction orifice plates and critical flow devices their calculation, construction and application for pressure control and flow limitation flow measurement of liquid, gas and steam according to the differential pressure principle has been a recognized principle for many years using orifice plates, venturi tubes and flow nozzles. A fluid passing though an orifice constriction will experience a drop in pressure across the orifice. General specifications model fop orifice plate is a differential pressure type primary device used to produce a fluid flow restriction in a pipeline. Restriction orifice plate program restriction orifice program is specially designed to assist engineers for limiting the flow which is the intended purpose of reducing the flowing pressure or the rate of flow. Hardware installation for rosemount 1495 orifice plate. In case you need to convert fromto normal or standard flow rate use the links above. Orifice plates and plate sealing units miquelon meter. It uses the same principle as a venturi nozzle, namely bernoullis principle which says that there is a relationship between the pressure of the fluid and the velocity of the fluid. Design guide for multistage restriction orifices ros plates with 1 hole and n 3 holes technical report march 2016 with 4,271 reads how we measure reads. Generally the plate holder is of soft iron material. The task of properly sizing an orifice plate for any given application is complex enough to recommend the use of special orifice sizing computer software provided by orifice plate manufacturers. This change can be used to measure the flowrate of the fluid.
An orifice plate is an instrumentation device which is used for measuring the gas or liquid flow rate, reducing the pressure of flowing fluid or gas, and restricting the flow rate. Plates can be configured to work as recessed, pressed, or pressed with tab so you can identify the orifice size without breaking the union. If high delta pressures, a change in phase or sonic issues can occur, a complex design will be required. The vena contracta corresponds to the narrow throat of a venturi tube. Abb offers a variety of orifice plate bore profiles for restriction plates and these can be classified as follows. The orifice influences the flow field both upstream and downstream of the orifice plate. Klm technology group restriction orifice program is very useful to calculate proper orifice size, flow rate, and. Orifice flow calculation data sheet calculating an orifice diameter it is difficult to accurately calculate the flow of a gas or liquid through a tiny orifice due to the effect of the leading edge of the orifice. It is evident that the fully developed velocity profile becomes distorted as the flow approaches the upstream face of the orifice plate.
Flow measurement excellence the orifice plate is the most commonly used differential pressure device offering economical, simple and sufficient accuracy for many applications with. The location of vena contracta associated with the first orifice was found to be independent of. One type is the restriction orifice plate, which in construction and calculation follows the orifice plate, i. This plate creates a restriction in a pipe that causes a difference in pressure between the two sides. Pair a meriam orifice plate with an orifice flange to provide a convenient, accurate method for installing orifice plates. Orifice plate assemblies with rtj holder flow measuring. Depending on the service, these seals are made of nitrile, tfe, or stainless steel. 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. Pdf dimensions of restriction orifice plates for asme. It is precision molded and provides four metaltometal sealing surfaces 360 around the plate. Plates can be configured as recessed, pressed, or pressed with tab to identify size without breaking the union. This could for instance be after a control valve in order to divide the required pressure loss into two elements. Line sizes 210 require a removable orifi ce plate seal. Dimensions of restriction orifice plates for asme b16.
Measurement errors can be found throughout an orifice metering system. Figure 3a represents the velocity vectors for a single orifice of diameter ratio d r 0. Much test data has been compiled about orifice plates. Orifice plate sealing units dsc dual seal line sizes 2 to 16 inch the daniel dual seal is the most simple and practical orifi ce plate sealing device for normal fl owing streams.
It is known that if severe cavitation occurs at piping in which the restriction orifice is. This solution is called multistep restriction orifice. Orifice flow meter generally have a profile for the first pit straight, but then notched bevel with a slope of about 45. Restriction orifice unions consist of orifice plates that are onepiece stainless steel shaped to fit the contour of the union seat ball to cone, eliminating the need for gaskets. This is the most common tap configuration and is recognized by the latest aga specifications. Concentricity the centre of the orifice shall not differ from the centre of the plate by more than 0. Orifice plates cover a wide range of applications of fluid and operating conditions.
A little downstream of the orifice the flow reaches. Inserting the higher discharge coefficient value of 0. Tabbed orifice plates and clamps are also available. Design guide for multihole ro plates with n 3 holes. The point where the fluid flow profile constricts to a minimum crosssectional area after flowing through the orifice is called the vena contracta, and it is the area of minimum fluid pressure. There have been several papers written identifying the errors in flow for 4. Emco restriction plates for insertion between raised face flanges are used to restrict the flow in order to prevent damage on pipe line equipment on the upstream side in blow down systems. Orifice plates provide the most reliable and accurate flow measurement for gas, liquid and steam, across a verity of industries. Model 5 720 calibrated orifice flow meters are desig ned for measurin g flows of air or g ases at pressures up to 100 psig and temperatures to 700 of. The restriction orifice plate is mostly applied in noncritical flow limitation.