Pipe Nipples

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In the piping and plumbing industry, a piping nipple is a pipe fitting, consisting of a short straight piece of pipe, usually provided with male pipe thread at both ends, for connecting two other female threaded fittings or pipes. It is one of the most popular categories of pipe fittings. Pipe Nipples are commonly used as adapters from one connection type to another. Pipe nipples are mainly used in low-pressure piping systems. They are used to fit straight end hose or pipe. The working pressure of pipe nipples will vary with the size and construction of the pipe, temperature, and product being conveyed. Pipe nipples are available in the widest variety of wall thicknesses and materials in the industry.
Pipe nipples are fabricated by cutting a specified length of pipe and applying the desired end connections. The pipe nipple dimensions and material follow from pipe specifications based on ASME code B16.11. Pipe nipples come in seamless, threaded, grooved, barbed, bent or welded construction.
The length of pipe nipple is usually specified by the overall length including threads. Pipe Nipples can come in any specified length, but most commonly range between close to 12”. A close pipe nipple is the shortest piece of pipe necessary to allow for fully threaded end connections, where there is no smooth surface between threads. Threads used on nipples are BSP, BSPT, NPT, NPSM and Metric.
Fig. 1: Various types of Piping Nipples
The basic purpose of a swage nipple is to bringing the flow of fluids from one pipe size to another. These are available with plain, beveled, or threaded ends.
In pipe nipples where there is a little space between both the threaded ends, there may have a hexagonal section in the center for a wrench to grasp the nipple. These nipples are called as “hexagonal nipple”. This hexagonal section in the middle functions like a nut that can be gripped by a normal wrench, providing a greater mechanical advantage than normally rounded pipe nipple. A hexagonal nipple with more distance between the threaded ends is called a “long hex nipple”.
For ping systems which require a change in pipe dimension, “reducing nipple” or “unequal nipple” is used. Reducing nipple takes a female fitting with a larger connection and attaches it to a smaller one. Care should be taken when using these parts since a reduction in pipe diameter can mean more pressure and a greater flow rate in the smaller pipe/fitting.
For piping systems which require pipe connection to tubing, “hose nipple” is used. Hose nipple features a male threaded connection on one end and a hose barb on the other end. The hose barb may be the same size as the pipe connection or it may be of reduced size.
For piping systems which require to be connected to welded pipes or fittings, “welding nipple” is used. Welding nipple has a threaded connection on one end and a normal cut pipe at the other end. The unthreaded end of the pipe provides more surface area for the use of welding materials to make a stronger connection. One main benefit of welding nipple is that once the unthreaded end is connected, connecting pipes or other fittings to the threaded end becomes much easier.
Fig. 2: End Connections of Pipe Nipples
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I am a Mechanical Engineer turned into a Piping Engineer. Currently, I work in a reputed MNC as a Senior Piping Stress Engineer. I am very much passionate about blogging and always tried to do unique things. This website is my first venture into the world of blogging with the aim of connecting with other piping engineers around the world.
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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
Iron and Steel Pipe and Pipe Fittings
Iron and steel are more economical than stainless steel. They are compatible and can be used interchangeably.
Stainless Steel Pipe and Pipe Fittings
Stainless steel has very good to excellent corrosion resistance.
Brass and Bronze Pipe and Pipe Fittings
Brass and bronze have good corrosion resistance. They are often used in drinking water and plumbing applications. Brass and bronze are compatible and can be used interchangeably.
Aluminum has good corrosion resistance and is lightweight.
Copper-Nickel Pipe and Pipe Fittings
Copper-nickel has excellent resistance to stress cracking and has better corrosion resistance than most stainless steel alloys. It can stand up to corrosive environments, such as salt water applications.
Plastic pipe and pipe fittings are lighter in weight than metal pipe and pipe fittings. They are typically for low- to medium-pressure applications up to 1,000 psi.
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