The gripping action keeps the tubing from slipping under pressure, which could be dangerous. Single-ferrules are usually used when the number of components can easily be reduced without compromising the reliability of the seal. This article discusses compression tubing as it compares with threaded pipe when it comes to efficiency, longevity, and ease of use. www.processingmagazine.com is using a security service for protection against online attacks. Ferrule Fittings keep the fibers perfectly aligned in the connector, which makes the connection precise. A dual-ferrule, also known as twin-ferrules, comprises two separate ferrules that attach: a front ferrule and a back ferrule. This hardened portion is then able to bite down into the softer metal of the tubing, providing grip. Because both ferrules in double ferrule fittings are holding on to the connected tube, these fittings will have a stronger mechanical grip on the tubes they are connected to, compared to single ferrule fittings. Even the most basic or miniaturized ferrule fittings can be suitable for pressures of up to 5000 psi. This allows for the use of un-flared tubing with these connectors. being used, plus an inner cone. By rggroup on February 27th, 2020 in Instrumentation. Nottingham, UK The angled front end of the ferrule compresses into the fitting body and grips the tubing. All rights reserved. It is not just a flexible material for structural material but also an ideal conductor of electricity. Often, these ferrule fittings are rated for pressures in excess of 6000 psi. Vibration can then flow from the back of the ferrule and through the nut/ body of the assembly with less interference on the gripping action on the front end of the ferrule. These fittings have two types, such as single ferrule and double ferrule. In general, both single and double ferrule fittings are manufactured in sizes between 1/16 of an inch and 2 inches. The reason behind their wide usage is the high working pressure rating which is typically above 6000 psi. Today we are talking about the difference between needle valves and ball valves. Single ferrule fittings have relatively less pressure rating as compared to its twin-ferruled equivalent. This double ferrule fittings can be utilized for tubing purpose with different widths and varying hardness levels. The design is more suitable for applications performed in high pulsation and vibration conditions. Ferrules in single ferrule fittings may sometimes be asymmetrical, unlike the symmetrical fittings found in double ferrule fittings. A dual-ferrule compression fitting is made up of four components, two of which comprise the ferrule itself. At a minimum, consider the following: Want to learn more? |, 2018 Titan Fittings. A pipe ferrule is one of the types of pipe fitting which are manufactured by using various materials. However, different applications require different types of ferrules. Many different factors in a compression fittings construction including size and material will have an impact on how that fitting performs and the kinds of conditions it will work best in. Write us: sales@sealexcel.com. Toronto HQ In industrial settings, lengths of tubes or pipes often need to be joined together. PTFE is a fluorocarbon solid that has contents of fluorine and carbon. RG Group has more than 60 years of experience as a provider of engineered solutions and stocks a variety of single and double ferrule fittings, manufactured out of a range of materials and suitable for a variety of industrial applications along with thousands of other industrial-grade products. Oops! Single ferrules may also provide better resistance to high vibrations, fluctuations in or cycling temperature or pulsation. You will be redirected once the validation is complete. 56 & 61, Veena Dalvai Industrial Estate, However, there are some applications where single ferrule fittings are more suitable. In double ferrule fittings, vibration and pulsation can affect the seals by allowing stress from these instances to concentrate at the non-isolated back ferrule grip. The double seal advantage on stainless steel tubing creates a highly-efficient seal that the single ferrule product cant compete with. When choosing the right tube fitting, it is critical that you understand the advantages and shortfalls of various fitting designs. Los Angeles, California This process is automatic. It is a type of ring or cap that is connected to an object to protect from splitting, damage, or wear. Single ferrule compression tube fittings are typically manufactured from either 316 stainless steel or brass, in part because these materials are resistant to corrosion. Despite its advantages, double ferrule fittings are generally the most preferred option than single ferrule fittings. By the end, you will have a better understanding of which one to use for what kind of application. Basic one-piece ferrules may not be suitable for very high levels of pressure. Both ferrules will be constructed out of the same basic components a threaded compression nut and the fitting body and either a single ferrule or a pair of front and back ferrules. Thank you! They are regularly used in process measurement and control systems in aerospace, defense, chemical processing plants, medical equipment and oil & gas industries. Registered Office & Unit-I : By comparison, single ferrules only feature one ferrule. Both types of movement arent particularly desirable and can cause various issues like galling of the ferrule, which can result in permanent leaks or components that are stuck together. or (United National Extra Fine) threads and sizing is determined by the outside diameter of the tubing being used. Each of the different components of the fittings can be manufactured from different materials typically, however, the ferrule and nut are made of some kind of common corrosion-resistant metal, like stainless steel. Our Tube Fitting Essentials training course provides an in-depth look at the advantages and disadvantages of various tube fitting designs and manufacturing processes, as well as a number of other connection types commonly encountered in todays fluid systems. | Privacy Policy. Proper selection, handling and installation of tubing are essential for reliable tubing system performance, In some cases, lubrication is required on the threads of the mating nut to prevent galling, The tubing needs to becarefullycut,deburred,chamferedand free of defects or scratches,before installation, The application and materials used in the manufacture of the fittings, make corrosion a consideration during system design, They are more expensive than non-instrumentation style fittings, They are readily available and offer a large variety of sizes, shapes, combinations and materials, Double ferrule compression fittings make a strong and leak-safe seal when installation steps are properly followed, They have greater vibration resistance then other instrumentation fittings like Cone and Thread fittings, They are extremely reliable and safe in systems with low to high pressure ratings, They perform equally well on thick and thinner walled tubing, Because of their flexibility, reliability and relative ease of installation, double-ferrule compression fittings are a standard choice in overall instrumentation system design. Please enable cookies on your browser and try again. The pressure rating depends on wall thickness and construction, both of which are related to the size of tubing. there are more than 11 ways a person can incorrectly install the ferrules. Single ferrule fittings use a lone ferrule to create a seal and grip the tubing. One ferrule (the sealing ferrule) seals the fitting and helps to hold it in place while the other (the locking ferrule) only helps to hold the fitting in place. The specialization of the front and rear ferrules resulted in better sealing performance and greater tube grip than single ferrule designs. The inside ferrule is called the locking ferrule, while the one on the outer side is called the sealing ferrule. In a compression fitting with a single ferrule, the nut can transfer torque to the ferrule as it is being tightened, which can cause the ferrule to compress asymmetrically over time. Other specialized ferrules, like heat-treated ferrules, are sometimes used in fittings that need to be rated to more extreme levels of pressure. Mostly manufactured from 316 stainless steel or brass, single ferrule tube fittingsare available in sizes ranging between 1/16 to 2 inches. This means that even miniaturized single ferrule fittings can be effective in pipe systems moving gases like compressed CO2 or hydrogen, which is common in aerospace applications. As discussed earlier, both pieces have their specified roles to create the ultimate sealing product. Our Superlok tube fittings use a patented technology thats not available on any other tube fitting. This is because less rigid materials may not be able to resist the force placed by the ferrule upon the tubing or piping. Ferrule fittings improve upon traditional fittings by adding in ferrules metal rings or caps that are designed to help the fitting properly seal metal-to-metal connections and hold them in place. for our newsletter and get the latest news. Since it is a large investment, focusing on details will help you, Aluminum is versatile. These compression fittings especially single ferrule fittings are also easy to install or remove in most cases and only require the tightening or loosening of the fitting nut. Much care goes into the design of both single and double ferrule designs. Cleveland, Ohio Subsequently, double ferrule fittings have a slight disadvantage compared to the single ferrule for these vibration and pulsation applications. API 682 - Plan 13 Flush, from Chamber to Suction solution, API 682 - Plan 14 Flush, Combination of Plans 11 and 13 solution, API 682 - Plan 22 - Cooled Flush with Strainer, API 682 - Plan 23 Cooled Flush Recirculated through Seal Chamber solution, API 682 - Plan 31 Flush with Cyclone Separator solution, API 682 - Plan 32 External Flush solution, API 682 - Plan 41 Cooled Flush with Cyclone Separator solution, API 682 - Plan 75 Condensing Leakage Collection solution, API 682 - Plan 76 Noncondensing Leakage Collection solution, API 682 - Plan 72/76 Buffer Gas and Noncondensing Leakage Collection, API 682 - Plan 52 Buffer Fluid Seal Pot solution, API 682 - Plan 53A Barrier Fluid Seal Pot Pressurized by Nitrogen solution, API 682 - Plan 53B Barrier Fluid Pressurized by Barrier Accumulator solution, API 682 - Plan 53C Barrier Fluid Pressurized by Piston Accumulator, API 682 - Plan 54 Barrier Fluid Pressurized by External System solution, API 682 - Plan 55 Barrier Fluid Circulated by External System, API 682 - Plan 62 Quench from External Source, API 682 - Plan 65A Leakage Collection with Reservoir, API 682 - Plan 65B Leakage Collection with Reservoir, Tube Fitting Installation and Safety Training, Process Analyzer Sampling System Training. Toronto, Canada Will the fitting provide the tube grip necessary to contain system pressure and pressure and temperature fluctuations? However, if youre using the double ferrule method, there are more than 11 ways a person can incorrectly install the ferrules. These fittings prominently enable consistent leak-tight connections, due to strong mechanical grip. Some instruments or facilities have been made using single ferrule fittings. This prevents an uneven transfer of torque and protects the system from leakages. The basic design consists of four main pieces: nut, front ferrule, back ferrule and the body. Corporate Headquarters Hence, the pressure rating of a tube in a particular operation varies based on these factors. Generally speaking, dual-ferrule designs are better suited for compression fittings that are made for high-pressure applications. In situations where accurate assembly is key or large numbers of fittings need to be installed, single ferrule fittings may be the superior option. Click here to learn more about this amazing patented solution. Pipingmart is B2B portal specializes in industrial, metal and piping products. Tube fittings generally come in two varieties; single or double ferrule. Similarly, the type of tubing is significant too. This back-end ferrule compression action protects the front of the single ferrule in an attempt to isolate tube vibration from affecting the front end tube bite. Compression tube fittings are essential components used in a wide variety of industrial applications, especially in situations where tubes or pipes are under very high pressures and need to be joined in such a way that prevents leaks. In this case, the single-ferrule performs two functions simultaneously: it both seals the fitting and locks it in place. Comparably, fittings with two ferrules are called a double ferrule fittings. The seal is made between the front ferrule and the cone. Everything You Should Know About Thermal Insulation for Piping. isolate tube vibration from affecting the front end tube bite. Single ferrule designs will also work reliably even when the ferrule is manufactured out of softer materials, like brass or plastic. These fittings are designed in a manner that makes it almost impossible to install them incorrectly. Most significantly, when working with a piping system, it is easy to get confused about whether to use single-ferrule or dual-ferrule for your compression fitting. While it may seem like a subtle difference, one of the biggest factors is how many ferrules that compression fitting uses one or two. Users may thus prefer use of these fittings for such applications. These can be used for both thick- and thin-walled tubings and for hard and soft tubings. Describe what youre looking for and well let you know if we have what you need. If youre interested in working with RG Group,contact us today. When a double ferrule fitting is installed, any action or torque should be in the fitting, rather than the tube, meaning that the installation of the fitting will be less likely to cause any wear or damage to the tubing. This is because in a compression fitting with a single symmetrical ferrule, its possible for the nut to transfer torque to the ferrule as it is tightened. This design creates a sequential grip on the tube. As a result, double ferrules are often recommended over single ferrule compression tube fittings, regardless of the conditions these fittings will face. There are mainly two different typessingle ferrule and double ferrule tubings. Single ferrule fittings are best in situations where installation needs to be kept as simple as possible or when replacing fittings in a system that previously used single ferrule fittings. One ferrule seals the fitting while the other one holds it in place. The two-piece, double ferrule product incorporates a better sealing technology than the single ferrule system. The gripping action of the rear ferrules prevents tubing blow-out when the system is pressurized. A look into the different construction types of stainless steel instrumentation tubing, focusing on the differences between seamless and welded. A double ferrule compression fitting is the most common instrumentation style fitting. Cleveland, USA Different industrial plants use stainless steel compression tube fittingsfor a range of applications. However, neither type of ferrule fitting is specific to any one industry, and both can be valuable in any power fluid design. USA The number of ferrules a fitting has can greatly affect its performance including the pressures it can stand up to and the kind of grip it will have on the tube it is connected to. Something went wrong while submitting the form. 2022 Swagelok Chicago | Milwaukee | St. Louis. Many compression fittings applications have high vibration and pulsation factors to consider. Xuzhou, China, USA Toll Free: (888) 331-1523 www.processingmagazine.com is using a security service for protection against online attacks. When installing a single ferrule to the body, is only one way a person can install it incorrectly. Single ferrules are easy to install as not installing a ferrule would be hard to miss. Theyre also made to withstand a variety of conditions like high pressures, cycling or fluctuating temperatures and in vacuums. Double ferrule fittings are rated for higher pressures than comparable single ferrule fittings. Parker Hose & Fitting Store Montoursville. When making a selection, it is important to be aware how a fittings ferrule design will impact its performance. 6 Common Solutions for Labor Shortages in the U.S. These ferrule fittings make grip by the back ferrule and create a seal by the front ferrule. Double ferrules come with a front ferrule that compresses into the fitting body and a smaller, freely rotating back ferrule that can easily decouple the nut from the front ferrule. Utilizing this patented technology, we guarantee Superlok tube fittings to be leak-free for life. Sarah is our four star customer care team general. Both double and single ferrule fittings are used to join together lengths of tubing or piping in such a way that creates a seal while preventing any vibration or movement of the tube or fitting, effectively holding the created joint in place. One of these ways includes a chance that one of the two-part pieces could go missing, leaving only one piece to be installed into the body incorrectly. International, Birmingham, UK Emailor call 866.901.0151. The development of the single ferrule tube fitting provided many advantages over other connections of the time. These fittings often need to stand up to extreme conditions like high pressures, vibrations and cycling temperatures. Depending on the nature and purpose of the compression fitting application, either single-ferrule or dual-ferrule can be used. Upon installation, the addition of tubing makes it a five-component connection. All rights reserved. Winnipeg These have fewer pieces than most other types of fittings. Both single and double ferrule fittings are manufactured in a wide variety of end connections and configurations so that its possible to join tubes together for most industrial needs. Yuhuan, China Making the correct choice will ensure that your piping system does not become subject to leakages or damage. Today together with copper, Aluminium, PTFE, i.e., polytetrafluoroethylene, is an essential and adequate material for gaskets. 13823 Santa Fe Crossings Dr, Edmond, OK 73013. Both types of fittings are mainly used with the connector to join the fiber cable to another cable or a transmitter as well as the receiver. The tubing is held in place by the swaging action caused by the tightening of the nut, which forces the front and back ferrules to bite into the tubing, firmly holding it in place. Its primary advantage was that it required no special tools for installation. Questions on choosing the right fitting for your application? Please enable JavaScript on your browser and try again. Cullen Crawford of the Crawford Fitting Company introduced the first flareless fitting design in the 1940s with a two-ferrule design. These fittings are designed to hold two or more lengths of piping or tubing together or to cap off one end of a pipe or tube, while also keeping them sealed against high levels of outside pressure. Also, share latest information and news related to products, materials and different types grades to help business dealing in this industry. Single-ferrule designs tend to work best when manufactured from soft materials like plastic and brass. hbspt.cta.load(1793404, '8e094a54-e5d8-42df-ad9e-f758ad467dfe', {}); Brennan has locations worldwide, including 13 strategically located distribution centers. These fittings are sometimes also designed with a longer thread area, which will help to evenly distribute the pressure placed on the fitting among the two ferrules.
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