An orifice plate holder consisting of a set of orifice flanges or an orifice. The followingis an overview of primary orifice metering equipment. A submerged orifice structure is shown in figure 8. Rangeability of orifice plates comes around 4 to 1. Orifice plates are most commonly used primary elements for flow measurement in pipelines based on the principle of measurement of differential pressure. Eccentric orifice plates are used in marw in including heavy and light chemicals. Rtj plates have no moving parts and are suitable for high temperature and pressure applications. Orifi ce plates are manufactured in strict accordance to aga, isa, asme, api, and iso standards.
Download information about different types of orifice plates with hub connections. 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. To determine the coefficient of discharge of the orifice meter 1. The orifice under consideration was circular diameter 0. Single chamber orifice fittings are used if frequent orifice plate changes are required and if the flow to the orifice. Flowcalc32 ce is a windows orifice plate sizing program for calculation of various differential pressure flow measurement devices.
Markings all plates are marked with the line size, material of construction, bore size, reference temperature, and heat lot number. This chapter describes the main design specifications for orifice plates more precisely, orifice meters. Depending on the service, these seals are made of nitrile, tfe, or stainless steel. The simplest design of orifice plate is the squareedged, concentric orifice. Squareedged orifice plates may be installed in either direction, since the orifice plate. Orifice plates provide the most reliable and accurate flow measurement for gas, liquid and steam, across a verity of industries. Daniel, flange union, daniel industries orifice plate. Orifice plate, model flcop orifice flange, model flcfl. Orifice plate, orifice flange model flcop, flcfl, flcac. The eccentric and segmental orifice plates are used to measure flow rates of fluids containing suspended materials such as solids, oil mixed with water and wet steam. Pair this up with an orifice flange to provide a convenient, accurate method for installing orifice plates. The simplest form of orifice plate consists of a thin metal sheet, having in it a square.
The impact of the orifice plate deformation on the differential pressure value article pdf available in the european physical journal conferences 45. The orifice plate flow detector is the simplest of the flowpath restrictions used in flow detection, as well as the most economical. Orifice plates are typically sandwiched between two flanges of a pipe joint, allowing for easy installation and removal. Line sizes 210 require a removable orifi ce plate seal. Therefore we only employ state of the art manufacturing, iso 9001 quality control and skilled craftsmanship to exceed these. The sizing of multiholes orifice plates is achieved in our design office with the same software as the one used for sharpedge orifice plates.
The square edge on the hole in an orifice plate helps to minimize contact with the fastmoving fluid stream going through the hole. Line sizes 12 and above require the seal to be vulcanized to the o. By default, the calculator will show an orifice plate calculation example. Orifice plate free download as powerpoint presentation. For orifice plates, pressure loss is medium and it mainly depends upon the area ratio. The point where the fluid flow profile constricts to a minimum crosssectional area after. The program can be used to calculate orifice plates. An orifice meter is a fluid flow measuring device that produces a differential pressure to infer flow rate. Orifice sizing principles an orifice meter is a device used for measuring the rate of fluid flow. Installation study of effect on orifice plate 1 palani s, 2 deljin kuriackose, 3 shanmugan s and 4 ganapathy srinivasan r 1 associate professor, department.
For those who want to use an orifice plate or a venturi tube the standard iso. Avco controls orifice plates avco manufactures orifi ce plates from 1496 in line size. In red you will find an orifice calculation, feel free to substitute this numbers with your own ones. This can be accomplished for the cost and effort of revising the calculation, buying a new orifice plate, and reconfiguring the transmitter, activities. Orifice flanges are one of the most economical means of measuring flow, and daniel orifice flanges are manufactured to be the most accurate.
It is based on proven technology, has no moving parts and is suitable for hightemperature and highpressure applications. The rtj plates joins an integral gasket oval or octagonal ring for mounting between rtj flanges. One type is the restriction orifice plate, which in construction and calculation follows the orifice plate, i. Orifice plates are most commonly used primary elements for flow measurement in pipelines based on the principle of measurement of differential pressure created when an obstruction is placed in the fluid flow, due to increase in fluid velocity.
Training natural gas orifice measurement technicians meeting the demand mark b. This is beneficial in order to reduce noise and protect downstream equipment. This type of orifice plate is manufactured by machining a precise, straight hole in the middle of a thin metal plate. Characterization of hydraulic behavior of orifices. A standard orifice plate has a bevel or cone shape. In this post the effect of venturi meter and orifice plate. Small side has a sharp edge and the edge should face upstream to the flow. Orifice plates, sanitary white ptfe solid standard. L 1877macweld 6229353 24 lougar avenue, sarnia, ontario n7s 5n7. 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.
The anechoic termination assured that the measured impedance was due to the orifice and surrounding plate alone. The upstream side of the orifice plate usually has a sharp, square edge facing into the flow stream. Unless otherwise specified, the plates will be beveled to the smaller of 150 of the line id or 18 of the orifice bore. The plate is similar to the type 500 orifice plate but has a 2in. Flow metering company ltd acknowledge the demanding requirements of both customer and industry standards. Orifice plates are the most important and critical component when measuring flow rate by differential pressure. The meter consists of the following elements see figure 11. As an option, the customers tag information can also be included. Orifice flanges feature pairs of pressure tappings which are machined directly into the orifice flange.
At lower reynolds numbers, the discharge coefficient of square edge orifice plate may change by as much as 30%. At lower reynolds numbers, the discharge coefficient of square edge orifice plate. Orifice plates typically have an accuracy of 2 to 4% of full scale. Types of orifice plates the typical designs of orifice plates are. The orifice plate has a tab or printed label on one side where the specifications for the plate are stamped. Orifice plates are manufactured to stringent guidelines and tolerances for flatness bore diameter, surface finish, and imperfections in machining such as nicks and wire edges on the bore. All nuflo orifice plates are traceable to a mill test report.
A differential manometer is connected at both upstream and downstream side of the flow. As primary flow elements, orifice plates repre sent the most common solution. The rtj type orifice plate incorporates an integral gasket, either oval or octagonal ring, for mounting between ring type joint flanges. The working of orifice plates is based on the bernoullis principle which provides a direct relationship between the fluid liquid or gas pressure and its velocity. Details of the software products used to create this pdf file can be found in the general info relative to the. The incipient cavitation number was evaluated for chamfered orifices with single phase computational. Each orifice plate has model number and orifice diameter stamped on tab for easy identification and selection. Orifice plates cover a wide range of applications of fluid and operating conditions. Restriction orifice plate program contd this is one of the best stand alone restriction orifice plate program available. Restriction orifice plates and critical flow devices. As liquid flows through the pipe, the flow suddenly contracts as it approaches the orifice and then suddenly expands after the orifice. Calculation of expansibility factor of gas at its flow. The beta or diameter ratios of concentric orifice plates range from 0. When a fluid whether liquid or gaseous passes through the orifice, its pressure builds up slightly upstream of the orifice.
The types of orifice plates include concentric, eccentric, segmental, quartercircle and square orifice plate, etc 2. Types of orifice plates advantages and disadvantages. A text label printed on the paddle of any orifice plate customarily identifies the upstream side of that plate. Box 999, 645 keddco street, sarnia, ontario n7t 7k6 telephone 519 3362960 fax 519 3443181 4120 78. Consists of onepiece ss orifice plates shaped to fit the contour. The line size, flange rating, orfice bore, and plate material is stamped on the handle. Description of the orifice flange for the mounting of orifice plates or flow nozzles, instead of pipe flanges, special orifice flanges are used. The orifice plate is a relatively inexpensive component of the orifice flow meter. This has the advantage of dispensing with any orifice carriers or pressure tappings in the pipe wall. Orifice ports are accurately machin ed f or precision measur ements. A restriction orifice plate is a device used to restrict flow.
Integral orifice plates are another type of orifice plate used for low flow rates. Their bore diameter is calculated to generate the specified diflerential pressure at full scale flow rate. Either a certificate of conformance or a lot traceable certificate is available upon request at time of order. In fact, this allows squareedged orifice plates to be used for measuring bidirectional flow rates where the fluid flow direction reverses itself from time to time. Principal components of a single chamber orifice fitting. The maximum velocity and minimum static pressure occurs. Orifice flange, model flcfl annular chamber, model flcac. Sometimes a drain or vent hole is provided where plates meet the pipe to avoid accumulation gas and air bubbles in the tube.
Fillman, chief operating officer david woods, vp technical services coastal flow field services, inc. Plates can be ordered in standard stainless steel or optional monel. It reduces flow and pressure from the upstream side to the downstream side. It uses the same principle as a venturi nozzle, namely bernoullis principle which says that there is a relationship between. The orifice plate is described as a thin plate and with sharp edge, because the thickness of the plate material is small compared with the internal diameter of the measuring aperture bore and because the upstream edge of the measuring aperture is sharp and square. Orifice plates are used between orifice flanges and are part of an orifice meters. The standard material of construction is 316 stainless steel. Orifice plates are recommended for clean liquids, gases and lowvelocity steam flows. Compact orifice plate for the direct mounting of differential. Orifice plate flow measurement civil engineering free. Iso5167 standard the multiholes orifice plate is a nonstandardized flow element but is designed and manufactured according to iso5167 standard requirements. Paddle type orifice plates series 520 series 520 the paddle type orifice plate series 520 is designed for use between orfice flange unions. A box is provided downstream from the orifice to protect unlined canals from erosion. The bore oftheeccentric orifice normally isinscribad in a circle thatis of the pipe diameter.
When designing and configuring orifice plates, there are several factors which must be followed to ensure accurate and reliable measurement. Standard paddletype plates are also available for use in daniel. Orifice information is stamped on the unique handle. This is generally the most commonly used type of orifice plate with the orifice bore positioned along the pipe centreline. Orifice plates flow measuring instruments for industrial. Jan 02, 2016 squareedged orifice plates may be installed in either direction, since the orifice plate appears exactly the same from either direction of fluid approach. Orifice plate definition of orifice plate by merriamwebster. Orifice plates and plate sealing units miquelon meter. Daniel, flange union, daniel industries orifice plate created date. Plate size and thickness orifice plates are available in. Orifice plates and venturi tubes michael readerharris springer. Orifice plates are suggested for clean and dirty liquids and a few slurry services. Surge tank orifices allow introducing head losses between a surge tank and the. Practical guidelines for specifying orifice fittings.
An orifice meter is a device used for measuring the rate of fluid flow. Corner tapstaps located at the face of the orifice plate normally used in the line sizes smaller than 2. Of all the pressurebased flow elements in existence, the most common is the orifice plate. By continuing to use the site, you agree to our privacy and cookie policy. These conical entrance orifice plates are used for low reynolds number in the range of 80 to 2000 and give more constant or predictable discharge coefficient. System dynamics p 9 catalogue orifice plates ring type joint orifice plate rating and line size inches ring number diameter p dimension w dimension x dimension y diameter z. Qi z 2010 head loss coefficient of orifice plate energy dissipator journal of. Restriction orifice plates as the headline implies two main types of flow limitation exist. Orifice plates, venturis and nozzles all provide a simple means of inducing a pressure drop to the fundamental relation u k h 0. Orifice plates, sanitary standard orifice plates gvc. To ensure that the orifice is submerged or to cut off the. White ptfe solid gaskets are animalderived ingredient free and meet usp class iv, ep 3. The orifice plate is basically a thin metal plate 1.
This is a thin, flat circular plate with a circular hole concentric to the pipe. Anorifice plateis 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. This is the most common tap configuration and is recognized by the latest aga specifications. Orifice plates are the simplest type of primary flow elements. Part 2 of iso 5167 specifies orifice plates, iso 5167 2 orifice plates pdf. Orifice plates series orc flow type orifice plates bore diameter as specified by customer w t o. Head loss coefficient through sharpedged orifices hesso valais. Looking at a side view of a squareedged concentric orifice plate reveals sharp edges 90 o corners at the hole. As the headline implies two main types of flow limitation exist. 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. Apr 01, 2016 applications of orifice meter the concentric orifice plate is used to measure flow rates of pure fluids and has a wide applicability as it has been standardized. The stamping on the orifice plate should also face upstream. When sizing orifice plates, some new rules of thumb can be applied to significantly improve orifice plate turndown and accuracy, while gaining extended measurement range, in most applications.
The orifice plate s provided were designed and manufactured specifically for this project. Both the sides and the floor of this box should be set outward from the orifice a distance of at least two times the height of the orifice. Aga3 download compute and measure orifice plates for gas and liquid. An orifice meter consists of a flat plate that has a sharpedged hole accurately machined in it and placed concentrically in a pipe as shown in figure 12. Pdf the impact of the orifice plate deformation on the. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. There is no parts list and there is no recommended. Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate. Universal type orifice plate the universal type orifi ce plate is designed to be used in an orifi ce fi tting. They are basically a small tube that you can mount directly to the differential pressure transmitter. Pair a meriam orifice plate with an orifice flange to provide a convenient, accurate method for installing orifice plates. Standard orifice plates have a 45 bevel that is machined on the bore hole periphery. This handle is designed to facilitate storage of the plate without damage to the orifice bore. In the case of a sharpedged orifice, the effective diameter is 0.
Diflerential pressure flow meters are used in many technical applications. An option to purchase on some transmitters, and there is an orifice inside the tube that connects the high side cavity to the low side cavity. To order drilled orifice plates, please contact us. When a fluid passes through an orifice plate that is installed in a pipeline, it limits or restricts the fluid flow and the fluid thus is forced to converge and pass. Standard orifice plates, bunan black orifice plates, epdm black orifice plates, viton black orifice plates, silicone platinum orifice plates, ptfe white orifice plates, ptfe white solid orific. Venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. Iso 22476 2 2005, read pressure loss of orifice plates according to iso 51671, flow measurement and instrumentation on deepdyve, the largest online rental service for free file pdf book iso 5167 3 download at perfect pdf book library. Acoustic absorption characteristics of an orifice with a. Orifice plate definition is a disk containing a calibrated circular hole bolted between two abutting pipe flanges to regulate flow. A number of special designs are available, including counter bores to limit the plateedge thickness with no bevel. Orifice flange unions the original orifice plate holding device was the orifice flange union figure 3. The concentric orifice plate flow meter has a sharp squareedged concentric bore that provides an almost pure line contact between the plate and the fluid, with negligible friction drag at the boundary. This issimply a metal plate with a hole in the middle for fluid to flow through.
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