A brass tubing and fittings is a fitting used in plumbing and electrical conduit techniques to join two tubes or thin-walled pipes together. In instances where two pipes made from different components should be joined (most frequently PVC and copper), the fittings is going to be manufactured from one or more suitable components right for the connection. Compression fittings for attaching tubes (piping) generally have ferrules (or olives in the united kingdom) in them.

Pressure fittings are used extensively in hydraulic, gas, and water techniques to enable the bond of tubes to threaded elements like valves and tools.[1] Compression fittings are fitted to a variety of programs, such as plumbing techniques in confined spaces where copper pipe could be hard to solder without having creating a fire risk, and extensively in hydraulic commercial applications. An important benefit would be that the fittings permit simple disconnection and reconnection.

In little dimensions, the pressure fitting is made up of an outer pressure nut and an internal pressure diamond ring or ferrule (occasionally called an “olive”) that is typically made of brass or copper or steel. Ferrules differ fit and materials but are most commonly in the shape of a diamond ring with beveled sides. To work properly, the ferrule must be oriented correctly, inside the case of copper olives these are usually barrel formed which indicates they should not be installed wrongly, but in which this is simply not so especially in Hydraulic and high stress applications the ferrule is fitted in a way that the longest sloping face from the ferrule encounters out of the nut.

Once the nut is tightened, the ferrule is compressed involving the nut and the getting fitting; leading to each finishes of barrel formed copper olives to get clamped across the water pipe when the midst of the ferrule bows from the pipe, within the case of hydraulic style ferrules they now have one finish which can be bigger having a 45 degree chamfer which tapers away (from set up exposure to the nut) as well as the little end generally has two inner biting sides, for programs challenging higher pressure, that penetrate the outside diameter of the pipe, the fixtures has to be tightened to guidelines as per DIN2353 as not to surpass the elastic limit from the steel ferrules, The end result is the fact that ferrule seals the space involving the water pipe, nut, and receiving fitting, thereby developing a good joints. The clamping support of the pipe through the force in the taper at each finishes assist in preventing motion from the pipe within the fitted, however it is merely the taper in the getting fitted itself that should seal completely, since if it does seal (to both the water pipe as well as the compression fitted) then no fluid can reach the nut threads or perhaps the taper in the nut finish to result in any leaks. Consequently some comparable fixtures can be produced utilizing an olive with only one taper (or perhaps a repaired cone sealed towards the pipe) where closing at that taper stops fluid from getting to the nut.

Larger sizes of compression fitting do not have one particular nut to compress the ferrule but a flange having a diamond ring of mounting bolts that performs this. The bolts have to be tightened uniformly.

Thread sealants like joints substance (pipe dope or thread seal tape such as PTFE adhesive tape) are unneeded on compression fitted threads, because it is not the thread that seals the joints but instead the compression of the ferrule involving the nut and pipe. However, a small amount of plumber’s oil or light oil applied to the threads will provide lubrication to help make sure a smooth, consistent tightening up from the pressure nut.

It is essential to avoid more than-tightening the nut otherwise the reliability in the compression fitting will be compromised through the extreme force. In the event the nut is overtightened the ferrule will deform improperly creating the joints to fall short. Indeed, overtightening is regarded as the common cause of leakages in compression fittings. An excellent guideline would be to tighten up the nut initially by hand until it is too difficult to go on and after that tighten up the nut one fifty percent-turn more with the aid of a wrench; the specific amount varies with the size of the fitted, being a bigger one demands less tightening. The fitted will then be tested: if minor weeping is noticed, the fitted is gradually tightened until the weeping stops.

The integrity in the compression fitting depends on the ferrule, which is effortlessly susceptible to damage. Therefore treatment should be come to when dealing with and tightening the fitted, even though in the event the ferrule is damaged it really is easily changed.

Types of fixtures

There are two varieties of compression fitted, standard (British kind-A/non-manipulative) and flare fittings (British type-B/manipulative). Standard fixtures need no modifications for the tubes. Flare fixtures need modification of the tubes using a unique tool. Standard fittings are typically utilized for water, hydraulic and compressed air connections, while flare fixtures are used for gas and high pressure lines.

A typical fitting can be set up employing an regular wrench to tighten up the nearby nut. To remove it, a specialized puller is usually used to slip the nut and ferrule off of the tube. If the ferrule is hard to remove it can be vulnerable with a cut, care being delivered to not nick the water pipe while reducing.


Compression fittings are well-known because they do not need soldering, so they are comparatively fast and simple to utilize. They might require no special tools or skills to function. They work at higher demands along with toxic gases. Compression fittings are especially beneficial in installs that may require periodic disassembly or part removal for upkeep and so on., as these joint parts can be damaged and remade without having affecting the integrity in the joint.[contradictory] Also, they are utilized in situations where a heat source, particularly a soldering torch, is prohibited, or where it is not easy to get rid of continues to be of water from within the water pipe which prevent the water pipe heating up to enable soldering.


Pressure fixtures usually are not as sturdy as soldered fittings. They are usually found in programs where fitting will never be disturbed and never subjected to flexing or twisting. A soldered joints is extremely tolerant of flexing and twisting (including when pipes knock or shake from unexpected pressure changes). Pressure fixtures are far much more responsive to these type of frzzdy pressures. Also, they are bulkier, and may be considered much less aesthetically pleasing compared to a nicely soldered joint. Compression fixtures work best when tightened once and never disrupted.[contradictory] Some pressure connectors may do not be reused, such as a ferrule ring type. It can do not be reused once they have been compressed. This connector is immediately placed over the water pipe and also the nut is tightened compressing the ferrule involving the water pipe and the body from the fitting. Pressure of this ferrule also results in deformation in the copper tubing. When a compression kind link needs to be redone, generally the compressed copper/ferrule will need to be shut down along with a new ferrule is to be used on a clear non-compressed bit of water pipe end. This really is to assure a leak evidence sound connection.

3/16 Compression Fitting – New Light On A Important Idea..

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