Threaded pipe and elbow

National Pipe Thread is a U.S. standard for tapered (NPT) or straight (NPS) threads used to join pipes and fittings. ANSI/ASME standard B1.20.1 covers threads of 60-degree form with flat crests and roots in sizes from 1/16-inch to 24-inch Nominal Pipe Size. The taper angle for all NPT threads is 3/4 inches per foot. The 1/8-, 1/4-, 3/8-, 1/2-, 3/4-, 1-, 1 1/4-, 1 1/2-, and 2-inch sizes are commonly used, appearing on pipe and fittings by most U.S. suppliers. Smaller sizes than those listed are occasionally used for compressed air. Larger sizes are used less frequently because other methods of joining are more practical at 3 inches and above in most applications. Image File history File links Malefemalepipe. ... Image File history File links Malefemalepipe. ... United States is the current Good Article Collaboration of the week! Please help to improve this article to the highest of standards. ... Pipe is a tube or hollow cylinder for the conveyance of fluid. ... The American National Standards Institute (ANSI) is a private, non-profit standards organization that produces industrial standards in the United States. ... The American Society of Mechanical Engineers (ASME) is a professional body, specifically an engineering society, focused on mechanical engineering. ... Nominal Pipe Size (NPS) is a set of standard pipe sizes used for pressure piping in North America. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial and U.S. customary unit of length. ...

Nominal Pipe Size is loosely related to the inside diameter of schedule 40 pipe. Because of the pipe wall thickness, the actual diameter of the threads is larger than the NPS, considerably so for small NPS. Other schedules of pipe have different wall thickness but the OD (outer diameter) and thread profile remain the same, so the inside diameter of the pipe is therefore different from the nominal diameter. Nominal Pipe Size (NPS) is a set of standard pipe sizes used for pressure piping in North America. ... Pipe is a tube or hollow cylinder for the conveyance of fluid. ...

Threaded pipes can provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid. These threads are now used in materials other than steel and brass, including PVC, nylon, bronze and cast iron. A liquid will assume the shape of its container. ... -1... In physical chemistry, and in engineering, steam refers to vaporized water. ... Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. ... Polyvinyl chloride Polyvinyl chloride, (IUPAC über Polychloroethene) commonly abbreviated PVC, is a widely used thermoplastic polymer. ... Nylon represents a family of synthetic polymers, a thermoplastic material, first produced on February 28, 1935 by Gerard J. Berchet of Wallace Carothers research group at DuPont. ... Assorted ancient Bronze castings found as part of a cache, probably intended for recycling. ... Cast iron usually refers to grey cast iron, but can mean any of a group of iron-based alloys containing more than 2% carbon (alloys with less carbon are carbon steel by definition). ...

The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to straight thread fittings or compression fittings in which the threads merely hold the pieces together and do not provide the seal. However a clearance remains between the crests and roots of the threads, resulting in a leakage around this spiral. This means that NPT fittings must be made leak free with the aid of thread seal tape or a thread sealant compound. (The use of tape or sealant will also help to limit corrosion on the threads, which can make future disassembly nearly impossible.) // Compression fittings are used in plumbing to join two tubes or thin-walled pipes together. ... Thread seal tape –commonly known as Teflon tape or plumbers tape- is a polytetrafluoroethylene (PTFE) film cut to specified widths for use in sealing pipe threads. ...

There is also a semi-compatible variant called NPTF or Dryseal, designed to provide a more leak-free seal without the use of teflon tape or other sealant compound. NPTF threads are the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path. Threaded pipe and elbow National pipe thread (NPT) is a U.S. standard for tapered threads used around the world to join pipe and fittings. ...

Sometimes NPT threads are referred to as MPT (Male Pipe Taper), MNPT, or NPT(M) for male (external) threads and FPT (Female Pipe Taper), FNPT, or NPT(F) for female (internal) threads. An equivalent designation is MIP (Male iron pipe) and FIP (Female iron pipe). In electrical and mechanical trades and manufacturing, each of a pair of mating connectors or fasteners is conventionally assigned the designation male or female. ... In electrical and mechanical trades and manufacturing, each of a pair of mating connectors or fasteners is conventionally assigned the designation male or female. ...

Pipe thread sizes

References

1. Oberg, Erik, Franklin D. Jones, Holbrook L. Horton, and Henry H. Ryffel (2000). ed. Christopher J. McCauley, Riccardo Heald, and Muhammed Iqbal Hussain: Machinery's Handbook, 26th edition, New York: Industrial Press Inc.. ISBN 0-8311-2635-3.

Machinerys Encyclopedia, 1917 Boiler, Machinerys Encyclopedia, 1917 Machinerys Handbook for machine shop and drafting-room; a reference book on machine design and shop practice for the mechanical engineer, draftsman, toolmaker, and machinist (the full title of the 1st edition) is a classic reference work in mechanical engineering...

See also

• AN thread
• Pipe (material)
• Threaded pipe
• Plumbing
• Pipe fitting
• RIDGID, manufacturer of pipe threaders
• Taps and dies
• British standard pipe thread

The AN thread is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. ... Pipe is a tube or hollow cylinder for the conveyance of fluid. ... A threaded pipe plug; note that the threaded portion is slightly conical and so touches the calipers at only two points. ... The plumber wrench for screwing various pipes Plumbing, from the Latin for lead (plumbum), is the skilled trade of working with pipes and tubing for potable water systems and for drainage of waste. ... Pipe fitting is the occupation of installing or repairing piping or tubing systems that convey liquid, gas, and occasionally solid materials. ... RIDGID is the popular name of the Ridge Tool Company of Elyria, OH. Founded in the 1920s as a manufacturer of professional plumbing and HVAC tools, they have relatively recently branched out into more general-purpose hand tools and power tools. ... Taps and dies are generally metalworking tools for the creation (cutting) of screw threads in metal parts. ... The British standard pipe thread (BSP thread) is a family of standard screw thread types that has been adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread. ...

External links

• Newman Tools Inc. and J.W. WINCO, INC. show the Whitworth form BSP or ISO pipe thread.