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Connection Methods for Tube Fitting

10/8/2013 4:36:55 PM | by Anonymous


Tube fitting is the occupation for repairing, installing tubes or tubing systems that convey the gas, liquid and occasionally solid materials. This work involves in preparing and selecting tubes or pipes and then joining them together by various means such as the locations and repair of leaks.


Tube fitting work can be done in many different settings such as hydraulics, manufacturing, refineries, power plant construction, nuclear powered super carriers and other steam systems. Tube fitters are sometimes simply called as “fitters”. They work with a variety of pipes and tubing materials which include several types of copper, iron, plastic, steel and aluminium. Tube fitting is specialized in fire prevention and is called the sprinkler fitter but in a separate trade.


A fitting is usually used in pipe plumbing systems that connect the straight pipe and tubing sections to adapt to the different shapes or sizes and for other purposes such as measuring or regulating fluid flow. The term plumbing is generally used to describe conveyance of gas, water or liquid waste in ordinary domestic or commercial environments whereas the piping is often used to describe the high performance conveyance of fluids in specialized applications such as high flow, high pressure, hazardous materials and high temperature.


The term for tubing is sometimes used for light weight piping especially for tubes that are flexible enough to be supplied in coiled form. The uncommon types of fittings require time, money, materials and tools to install so that they are consider as a non-trivial part of plumbing and piping systems.


The work for installing a tube or pipe system involves making reliable connections and leak proof. Additionally, most tube fitting requires mechanical support against gravity and other forces such as earthquakes and wind loads. Depending on the connection technology used, some basic skills may be sufficient or professional licensure and specialized skills may be required. Some of the connection methods are fastener, solvent welding, threaded pipe and compression fittings.


Fastener is a hardware device that can mechanically joins or affixes two or more objects together. They are usually attached to tubes and fittings to mechanical supports in buildings; however, they are not to interconnect the actual tubes to each other. The type of fasteners that are commonly used with piping include the machine bolt with nut, powder actuated tool and stud bolt with nut.


Threaded pipe is a pipe with a screw thread at both ends for assembly. Steel pipe is also often joined using the threaded connection where the tapered threads are cut into the end of the tube segment and the sealant is applied in the form of thread seal tape. They are widely used in many businesses and homes to convey propane fuel or natural gas and they are popular choice in fire sprinkler systems due to their high heat resistant. However, assembling threaded steel pipe will take some skill and need to plan carefully to allow lengths of pipe to be screwed together in proper sequence.


Solvent welding is applied to other plastic piping and to partially dissolve and fuse the adjacent surfaces of fitting and piping. They are usually used with a sleeve type joint to connect the tube and fittings that are made of the same material. Unlike the regular welding of metals, the solvent welding is relatively easy to perform although there is a need to produce reliable joints. They are typically used for plastics that are toxic, flammable or carcinogenic.


Another type of connection method is the compression fittings. They consist of a tapered concave conical seat and a hollow barrel shaped of compression ring as well as a compression nut which is threaded onto the body of the fitting and tightened it to make a leak proof connection. These fittings are typically made of plastic, brass or other materials may be used. Compression connections are advantageous in many cases as they are the easiest to install using any basic tools.

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