A 3 16 high pressure compression fitting is a fitting used in plumbing and electrical conduit systems to join two tubes or thin-walled pipes together. In instances where two pipes made of dissimilar components should be joined (most frequently Pvc material and copper), the fixtures will likely be made of one or more suitable materials right for the connection. Compression fixtures for affixing tubes (piping) generally have ferrules (or olives in the UK) in them.

Pressure fixtures are employed thoroughly in hydraulic, gas, and water techniques to permit the bond of tubing to threaded components like valves and tools.[1] Compression fixtures are suited to a variety of applications, like plumbing techniques in restricted areas in which copper pipe could be difficult to solder without developing a fire risk, and thoroughly in hydraulic industrial applications. A significant advantage is the fact that fittings permit easy disconnection and reconnection.

In little sizes, the compression fitting is composed of an external compression nut plus an internal pressure ring or ferrule (sometimes known as an “olive”) that is certainly typically made from brass or copper or metal. Ferrules vary fit and material but are most frequently within the model of a ring with beveled sides. To work properly, the ferrule must be focused properly, inside the case of copper olives these are normally barrel formed and also this indicates they cannot be installed incorrectly, but where this is not so especially in Hydraulic and high stress applications the ferrule is installed to ensure that the lengthiest sloping face in the ferrule faces from the nut.

When the nut is tightened, the ferrule is compressed between the nut and also the getting fitting; leading to both ends of barrel shaped copper olives to get clamped around the pipe when the middle of the ferrule bows away from the pipe, inside the case of hydraulic style ferrules they now have one finish that is bigger having a 45 level chamfer which tapers away (from set up connection with the nut) and the little end generally has two internal biting edges, for applications demanding higher stress, that permeate the surface diameter in the pipe, the fittings must be tightened to recommendations according to DIN2353 as not to surpass the stretchy restrict in the steel ferrules, The result would be that the ferrule closes the space involving the pipe, nut, and receiving fitted, therefore developing a tight joints. The clamping support from the water pipe from the force in the taper at each ends assist in preventing movement in the water pipe within the fitted, however it is just the taper in the receiving fitting itself that must seal completely, since when it does seal (to the water pipe and also the pressure fitted) then no liquid can reach the nut threads or even the taper on the nut end to result in any leaks. Because of this some comparable fixtures can be made using an olive with only one taper (or perhaps a fixed cone closed for the water pipe) where the sealing in that taper prevents fluid from getting to the nut.

Bigger dimensions of compression fitted do not possess one particular nut to compress the ferrule but a flange with a ring of mounting bolts that executes this. The bolts have to be tightened uniformly.

Line sealants such as joints compound (pipe dope or line seal adhesive tape like PTFE adhesive tape) are unneeded on compression fitting threads, as it is not the thread that seals the joints but alternatively the compression from the ferrule in between the nut and water pipe. However, a tiny amount of plumber’s oil or light oil applied to the threads will give you lubrication to aid make sure an effortless, consistent tightening in the compression nut.

It is critical to avoid over-tightening up the nut or else the reliability in the pressure fitted will likely be compromised by the excessive force. In the event the nut is overtightened the ferrule will deform incorrectly causing the joint to fall short. Certainly, overtightening is easily the most typical reason for leakages in pressure fittings. A good principle is to tighten up the nut first by hand until it is actually too hard to carry on then tighten up the nut one half-transform much more using a wrench; the actual quantity varies with the dimensions of the fitting, as a bigger one demands less tightening. The fitting will then be analyzed: if minor weeping is observed, the fitting is steadily tightened until the weeping stops.

The reliability in the pressure fitted is dependent upon the ferrule, which is easily prone to harm. Therefore treatment should be taken to when handling and tightening up the fitted, even though in the event the ferrule is damaged it is effortlessly replaced.

Types of fittings

There are two varieties of pressure fitting, regular (British type-A/non-cunning) and flare fixtures (English type-B/manipulative). Standard fittings need no modifications for the tubes. Flare fittings require modification in the tubes with a unique device. Regular fittings are typically used for water, hydraulic and compressed air connections, while flare fittings can be used for gasoline and high stress outlines.

A standard fitted can be set up utilizing an regular wrench to tighten up the surrounding nut. To get rid of it, a specialized puller is often used to slide the nut and ferrule off the tube. If the ferrule is hard to get rid of it can be weakened using a cut, care becoming come to not nick the water pipe whilst reducing.


Compression fittings are popular because they do not require soldering, therefore they are comparatively simple and fast to make use of. They might require no special tools or skills to operate. They work at higher demands and with harmful fumes. Compression fixtures are especially valuable in installations that may need periodic disassembly or part removal for upkeep and so on., as these joints can be damaged and remade without having affecting the integrity from the joint.[contradictory] They are also used in situations where a heat source, particularly a soldering torch, is prohibited, or where it is sometimes complicated to get rid of continues to be of water from in the water pipe which stop the water pipe warming up to allow soldering.


Compression fixtures are certainly not as robust as soldered fixtures. They may be typically used in applications in which the fitting is definitely not disrupted rather than subjected to flexing or bending. A soldered joints is extremely tolerant of flexing and bending (including when pipes knock or shake from unexpected pressure changes). Pressure fittings are far much more sensitive to these type of frzzdy pressures. Also, they are bulkier, and may be regarded as much less great looking compared to a neatly soldered joints. Pressure fixtures work best when tightened once and not disturbed.[contradictory] Some pressure connections may never be used again, such as a ferrule diamond ring type. It can do not be used again as soon as they have been compressed. This connector is directly positioned within the pipe and also the nut is tightened compressing the ferrule between the pipe and the entire body from the fitted. Pressure of this ferrule also leads to deformation in the copper tubing. If a pressure type connection needs to be redone, more often than not the compressed copper/ferrule will need to be stop and a new ferrule is going to be used on a clear low-compressed part of pipe finish. This is to assure a leak evidence sound connection.

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