A compression fitting is a fitting utilized in plumbing related and electrical conduit systems to join two tubes or thin-walled pipes with each other. In instances in which two pipes made of different materials have to be joined (most often Pvc material and copper), the fixtures will likely be made of one or more suitable components right for the connection. Compression fittings for affixing tubing (piping) commonly have ferrules (or olives within the UK) in them. Installation Parts Supply.com carries a complete line of plastic tube compression fittings

Compression fittings are used thoroughly in hydraulic, gas, and water systems to permit the bond of tubes to threaded components like valves and tools.[1] Compression fittings are suitable for many different applications, including plumbing related systems in restricted areas where copper pipe would be hard to solder without having making a flame risk, and thoroughly in hydraulic industrial programs. A major benefit is that the fittings allow simple disconnection and reconnection.

In little dimensions, the compression fitting is made up of an outer compression nut as well as an inner compression diamond ring or ferrule (occasionally known as an “olive”) which is typically made from brass or copper or steel. Ferrules differ in good shape and material but are most commonly inside the model of a ring with beveled sides. To function properly, the ferrule must be focused correctly, when it comes to copper olives they may be normally barrel formed which means they should not be fitted incorrectly, but where this is not so specifically in Hydraulic and stress applications the ferrule is fitted such that the lengthiest sloping face in the ferrule faces away from the nut.

If the nut is tightened, the ferrule is compressed involving the nut and also the getting fitted; causing each finishes of barrel formed copper olives to become clamped around the pipe when the middle of the ferrule bows away from the pipe, when it comes to hydraulic style ferrules they currently have one finish that is bigger using a 45 degree chamfer which tapers out (from set up contact with the nut) as well as the small end typically has two inner biting edges, for programs challenging higher stress, that penetrate the surface diameter of the pipe, the fixtures has to be tightened to guidelines depending on DIN2353 as never to surpass the stretchy limit from the steel ferrules, The effect would be that the ferrule closes the area involving the pipe, nut, and getting fitting, therefore developing a strict joint. The clamping assistance in the pipe by the force in the taper at each ends aid the prevention of motion of the pipe within the fitting, however it is only the taper at the receiving fitted itself that should seal completely, since if this does seal off (to the pipe and also the compression fitted) then no fluid can arrive at the nut threads or even the taper on the nut finish to lead to any leakages. Because of this some comparable fittings can be made utilizing an olive with only one taper (or a repaired cone sealed towards the pipe) where sealing at this taper prevents fluid from getting to the nut.

Bigger sizes of compression fitted do not have a single nut to compress the ferrule but a flange having a ring of mounting bolts that executes this task. The bolts need to be tightened evenly.

Line sealants including joint substance (pipe dope or line seal off tape such as PTFE adhesive tape) are unneeded on compression fitting threads, since it is not the line that closes the joint but instead the compression from the ferrule between the nut and pipe. Nevertheless, a tiny amount of plumber’s grease or lighting oil placed on the threads can provide lubrication to aid ensure an even, consistent tightening up from the compression nut.

It is critical to prevent more than-tightening the nut or else the integrity from the compression fitted will likely be compromised through the extreme pressure. When the nut is overtightened the ferrule will deform improperly causing the joint to fail. Certainly, overtightening is regarded as the common reason for leakages in compression fixtures. A great principle is to tighten up the nut first by hand till it really is too hard to carry on then tighten up the nut one fifty percent-turn more using the aid of a wrench; the actual amount differs with the dimensions of the fitting, as being a bigger one requires much less tightening up. The fitted is then analyzed: if minor weeping is noticed, the fitted is gradually tightened up until the weeping prevents.

The integrity of the compression fitting depends on the ferrule, that is effortlessly vulnerable to damage. Thus treatment ought to be taken to when handling and tightening up the fitted, even though in the event the ferrule is ruined it really is easily replaced.

Types of fittings

There are 2 varieties of compression fitting, standard (British type-A/low-cunning) and flare fittings (British type-B/manipulative). Regular fittings need no alterations to the tubes. Flare fittings require adjustment of the tubes having a unique tool. Regular fixtures are typically employed for water, hydraulic and compressed air connections, whereas flare fixtures can be used for gas and high stress lines.

A standard fitted can be installed using an regular wrench to tighten the nearby nut. To get rid of it, a specific puller is usually employed to slip the nut and ferrule off the tube. In the event the ferrule is tough to eliminate it can be vulnerable with a reduce, treatment becoming taken to not nick the pipe whilst cutting.


Compression fixtures are well-known as they do not need soldering, therefore they are relatively simple and fast to utilize. They might require no special resources or skills to function. They work at higher demands and with toxic gases. Compression fixtures are specifically beneficial in installs that could require occasional disassembly or partial removal for upkeep etc., as these joints can be broken and remade without impacting the integrity of the joints.[contradictory] They are also utilized in situations in which a heat source, particularly a soldering torch, is forbidden, or where it is sometimes complicated to remove remains of water from in the pipe which avoid the pipe warming up to permit soldering.


Compression fittings are certainly not as robust as soldered fixtures. They may be typically found in applications in which the fitting will not be disturbed rather than put through flexing or bending. A soldered joints is very tolerant of flexing and twisting (such as when pipes knock or shake from sudden pressure modifications). Compression fittings are much more understanding of these powerful pressures. They are also bulkier, and could be looked at less attractive compared to a nicely soldered joint. Compression fixtures function dwgtgh when tightened as soon as and never disrupted.[contradictory] Some compression connectors may not be reused, for instance a ferrule ring kind. It could not be reused as soon as they are compressed. This connector is directly positioned on the pipe and the nut is tightened compressing the ferrule between the pipe and the body from the fitted. Compression of this ferrule also brings about deformation in the copper tubing. In case a compression type link needs to be redone, most of the time the compressed copper/ferrule would need to be cut off and a new ferrule will be applied to a clear non-compressed part of pipe finish. This is to make sure a drip proof sound connection.

Compression Fittings For Plastic Tubing – Superior Catering Bulk Supplier..

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