A compression fitting is a fitting used in plumbing related and electric conduit systems to join two tubes or thin-walled pipes with each other. In instances in which two pipes made of different components are to be joined (most commonly Pvc material and copper), the fittings is going to be made of one or maybe more compatible components suitable for the connection. Compression fixtures for affixing tubing (piping) commonly have ferrules (or olives within the UK) in them. Installationpartssupply Providing OEM’s and Professional Beverage Installers with Commercial Grade Installation Supplies since 95. Check out our collection of compression fitting plastic tubing.

Compression fittings are used thoroughly in hydraulic, gas, and water techniques to allow the connection of tubing to threaded components like valves and resources.[1] Compression fixtures are fitted to a variety of programs, including plumbing systems in confined spaces where copper pipe could be difficult to solder without having making a flame risk, and thoroughly in hydraulic industrial applications. A major advantage is the fact that fittings allow easy disconnection and reconnection.

In little dimensions, the compression fitted is made up of an outer compression nut as well as an internal compression ring or ferrule (occasionally known as an “olive”) that is usually manufactured from brass or copper or steel. Ferrules differ in shape and material but are most commonly in the form of a ring with beveled sides. To work properly, the ferrule should be oriented properly, when it comes to copper olives they may be normally barrel formed which means they should not be fitted incorrectly, but in which this is not so especially in Hydraulic and stress programs the ferrule is fitted to ensure that the lengthiest sloping face of the ferrule faces out of the nut.

If the nut is tightened, the ferrule is compressed between the nut and the receiving fitting; causing each finishes of barrel shaped copper olives to get clamped round the pipe when the center of the ferrule bows away from the pipe, with regards to hydraulic design ferrules they now have one end which is bigger having a 45 degree chamfer which tapers away (from installation contact with all the nut) and also the little end typically has two internal biting edges, for programs demanding greater stress, that permeate the outside size from the pipe, the fittings must be tightened to guidelines depending on DIN2353 as to not exceed the stretchy limit of the metal ferrules, The result is the fact that ferrule closes the space between the pipe, nut, and receiving fitting, therefore forming a strict joint. The clamping assistance of the pipe from the force on the taper at both ends assist in preventing motion of the pipe inside the fitting, but it is merely the taper in the receiving fitting alone that must seal off totally, because when it does seal (to both pipe and also the compression fitting) then no fluid can get to the nut threads or perhaps the taper in the nut finish to result in any leakages. As a result some similar fittings can be produced employing an olive with only one taper (or a repaired cone closed to the pipe) where sealing in that taper prevents liquid from getting to the nut.

Bigger sizes of compression fitted do not have one particular nut to compress the ferrule but a flange using a diamond ring of bolts that executes this task. The bolts must be tightened uniformly.

Thread sealants such as joint compound (pipe dope or thread seal off adhesive tape such as PTFE tape) are unneeded on compression fitted threads, as it is not the thread that closes the joint but alternatively the compression from the ferrule in between the nut and pipe. However, a tiny amount of plumber’s grease or lighting essential oil put on the threads can provide lubrication to help make sure an effortless, steady tightening up of the compression nut.

It is essential to avoid more than-tightening the nut or else the reliability of the compression fitting will likely be affected by the extreme force. If the nut is overtightened the ferrule will deform improperly creating the joints to fall short. Indeed, overtightening is easily the most common cause of leaks in compression fixtures. An excellent rule of thumb is always to tighten up the nut initially yourself till it really is too hard to go on and after that tighten the nut one half-transform much more with the aid of the wrench; the specific amount differs with the dimensions of the fitting, being a larger one demands much less tightening up. The fitting is then analyzed: if minor weeping is observed, the fitted is steadily tightened till the weeping stops.

The reliability in the compression fitted is dependent upon the ferrule, that is easily susceptible to damage. Therefore care should be taken to when dealing with and tightening the fitted, even though when the ferrule is damaged it is actually easily replaced.

Kinds of fittings

There are 2 types of compression fitting, standard (English type-A/non-manipulative) and flare fittings (British kind-B/cunning). Regular fittings need no alterations for the tubes. Flare fixtures require adjustment of the tubes having a unique tool. Regular fittings are generally used for water, hydraulic and compressed atmosphere connections, while flare fixtures can be used as gas and pressure lines.

A regular fitting could be set up employing an regular wrench to tighten up the surrounding nut. To get rid of it, a specific puller is usually utilized to slip the nut and ferrule off the pipe. When the ferrule is tough to remove it may be vulnerable with a reduce, treatment being taken to not nick the pipe while cutting.


Compression fixtures are popular because they do not need soldering, therefore they are relatively fast and simple to make use of. They might require no special tools or skills to operate. They work on greater demands along with toxic gases. Compression fittings are specifically valuable in installations that could require periodic disassembly or partial removal for upkeep etc., because these joint parts may be damaged and remade without having affecting the reliability of the joint.[contradictory] Also, they are utilized in situations when a heat source, particularly a soldering torch, is forbidden, or where it is difficult to remove remains of water from within the pipe which stop the pipe heating up to enable soldering.


Compression fittings are not as sturdy as soldered fixtures. They are usually utilized in programs in which the fitting will never be disturbed and not put through flexing or bending. A soldered joints is very tolerant of flexing and bending (like when pipes knock or shake from sudden stress changes). Compression fixtures are much much more sensitive to these powerful stresses. They are also bulkier, and may be looked at much less great looking when compared to a nicely soldered joint. Compression fixtures function dwgtgh when tightened once and not disturbed.[contradictory] Some compression connectors may never be reused, for instance a ferrule ring kind. It may not be reused as soon as they have been compressed. This connector is immediately positioned on the pipe as well as the nut is tightened compressing the ferrule between the pipe and the entire body of the fitting. Compression of the ferrule also brings about deformation in the copper tubes. When a compression type link has to be redone, generally the compressed copper/ferrule would need to be cut off along with a new ferrule will be used on a clear low-compressed bit of pipe end. This is to ensure a drip evidence sound connection.

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