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Knowledge About Pipe Fittings

Views: 3     Author: Wang     Publish Time: 2024-02-22      Origin: Site

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Type of fittings

Pipe fittings are a general term for the parts in the pipeline system that connect, control, change direction, divert, seal, support and other functions. In order to transport liquid or gas, various pipes must be used. In addition to steel pipes for straight pipes, various pipe fittings are also used: elbows must be used when the pipes turn, large and small heads must be used when the pipes are reduced in diameter, and large and small heads must be used when the pipes are bifurcated. Tee must be used, and flanges must be used when connecting pipe joints. In order to achieve the purpose of opening the transmission medium, various valves must be used. In order to reduce the impact of thermal expansion, contraction or frequent vibration on the pipeline system, expansion valves must be used. Festival. In addition, on the pipelines, there are various joints, plugs, etc. connected to various instruments and meters. We are accustomed to refer to other fittings in the pipeline system except straight pipes as pipe fittings. According to different processing methods, pipe fittings can be divided into two types: butt welded pipe fittings and forged pipe fittings.

Butt welding fittings

Butt weld is to connect pipes and fittings ends by butt welding process. Also known by welded pipe fittings (butt weld fittings). It has ends in beveled or plain, dimensions normally from 3/4'' to 24''. Manufactured according to ASME B16.9. Material in carbon, alloy and stainless steel. Butt weld fittings can withstand pressures and temperatures in very harsh environments. They are generally considered to be the most robust welding fixture, no matter what industry is using them. However, they do take a considerable time to fit and a highly skilled installer is needed who can weld them correctly on site.

  • Welded connection offers a more robust, a stronger and a more leak-proof piping connection.

  • The nature of the continuous metal structure provides added strength to the overall piping system.

  • The smooth inner surface and gradual directional changes provide a seamless flow, thus minimising pressure drops and turbulence inside the pipe.

  • Provide the option of various different turn radiuses due to the manufacture of Short Radius fittings, Long Radius fittings and 3R Elbows.

  • Cost effective compared to the counterpart fittings in the threaded or socket weld varieties.

  • They have a long service life and are cost effective to purchase and deploy.

  • Butt weld fittings can withstand corrosion and erosion more effectively than its socket weld and threaded equivalents.

  • A welded system uses comparatively less space that the other alternatives.

Forged fittings

ASME B16 standard includes the pipes and fittings material in cast iron, cast bronze, wrought copper and steel. ASME B16.11 (covered by ASME B16), it is used in connecting with equipment in other volumes of ASM B16 series. Forged steel fittings named by their manufacturing processes forging, which to heat the carbon or alloy steel in a transforming temperature and modes the heated parts into the desired shape. Then use machining process to make a forged steel fittings. Forged pipe fittings is in high quality which with higher strength and could bear high pressure. To this fittings you should pay attention to have a uniform wall thickness since they have to be through threading process or machined to socket weld end. There are many advantages of forged fittings as opposed to butt welding fittings. These are as follows:

  • Due to the tight grain structure a forged fitting is mechanically stronger than a casted one.

  • Forged products are not susceptible to cavities, cold pour problems, porosity or shrinkage.

  • Forged fittings can use less expensive alloys but still retain very high strength.

  • The microstructure of forgings means it has more wear resistance and therefore is less likely to become brittle.

  • Forged fittings can withstand higher pressures in more extreme conditions.

  • Forged fittings have a longer and typically more reliable life expectancy than casted fittings.

  • Forged fittings are usually less expensive than casted ones.


Products of fittings

Elbow: The elbow is designed to change the direction of the fluid in the piping system. It has a long radius (LR) and a short radius (SR) type, and has different degrees covers to: 45 degree, 90 degree and 180 degree.

Tee: The tee (equal tee and reducing tee) has a 90 degree branch and a straight line pipe that will provide a connection to install another device for the pipeline systems.

Reducer Tee: The same structure of the T shape, but the size of the 90 degree branch is smaller than the diameter of the straight line pipe. Therefore to install a smaller size pipe or fittings.

Reducer: Reducer can adjust the flow rate and speed. One end welded with a large diameter pipe and another end with a smaller OD pipe. It has two types, Concentric and Eccentric Reducer.

Cap: Pipe End Caps are usually welded to the pipe end or mounted on the external thread of the pipe end to cover the pipe fittings. To close the pipeline so the function is the same as the pipe plug.


When it comes to optimizing component selection, visiting a fitting supplier is usually a smart idea because the structure and material requirements of fittings are application-specific. Tube fittings, on the other hand, are most commonly used with hydraulic or pneumatic systems. The first step in choosing the sort of fittings that are appropriate for the application is to identify the core system type.

Hydraulic applications include the transportation of liquid fluids such as water and other chemical solvents. Hydraulic fittings must have liquid-tight seals and are typically resistant to rust and other chemical damage. Gas transportation is engaged in pneumatic applications. Pneumatic fittings must have exceptionally tight seals and be chemically resistant to avoid gas loss. Tube fittings are used in several different applications, including structural design. Because these fittings do not transmit fluids, they must have excellent physical integrity but do not need to seal.

There is no end to applications of pipe fittings so long there is no end to the applications of pipes . While the list of piping applications continues to expand, its strength, flexibility, very good flow rates and high chemical resistance are qualities which are uniquely suited for the movement or transfer of liquids, steam, solids and air from one point to another. With piping, pipe fittings have many other uses like as follows:

  • The transfer of extremely hazardous materials such as chemical and waste.

  • Protection of sensitive equipment from high pressures.

  • Protection from corrosion and other extreme weather conditions.

  • Resistance to household and industrial chemicals.

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
Tel: +86 19339900211
Add: Stainless steel Market 289, Xinwu District , Wuxi, China
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