Pipe end

A pipe end is the description of how the section of pipe ends.

Pipe end
Specical end such as socket and spigot with O-ring etc.

Understanding pipe ends is important when designing a piping system since it would be inappropriate for the designer to specify a threaded connection for a large diameter pipe or to specify a welded end when connecting to a threaded component.

There are four main types of pipe ends: threaded, beveled, plain end or grooved end.


Threaded end

Typically used on pipe 3" and smaller, threaded connections are referred to as screwed pipe. With tapered grooves cut into the ends of a run of pipe, screwed pipe and screwed fittings can easily be assembled without welding or other permanent means of attachment. In the United States, the standard pipe thread is National Pipe Thread (NPT). The reason for this is that as NPT connections are assembled, they become increasingly more difficult for the process to leak. The standard taper for NPT pipe is 3/4" for every foot. Threaded End is abbreviated on drawings as TE.

Threaded fittings have threads that are either male or female. Male threads are cut into the outside of a pipe or fitting, while female threads are cut into the inside of the fitting. As screwed pipe and fittings are assembled, two pieces are pulled together. The distance that is pulled together is called the thread engagement.


Bevel end

A bevel is a surface that is not at a right angle (perpendicular) to another surface. The standard angle on a pipe bevel is 37.5° but other non standard angles can be produced. Beveling of pipe or tubing is to prepare the ends for welding. However, it can also be used for deburring the cut ends for safety or aesthetic reasons. Bevel End is abbreviated on drawings as BE.

The beveling process is generally automated. This is because a pipe beveling machine can cut the bevel much faster than hand grinding, flame cutting or turning the pipe on a lathe. Further, the automated process ensures that there is an accurate and consistant pipe bevel each time. The automated process is much safer as operating personnel are not exposed to the same hazards as a person beveling the pipe.

This is the most commonly used end and is used on pipe, pipe nipples, and swage nipples.

Beveling can applied to the face of any size or diameter of pipe.


Grooved end

A grooved end fitting has a groove or shoulder along the edge. This fittings groove allows for a seal without the need for welding.

The grooved pipe end means there is a processed groove on the end of a pipe or fitting. The grooved pipes or fittings are joint by victaulic couplings or other grooved,mechanical pipe fittings.

The groove connection is easily to assemble and disassemble,and used widely in HVACR and firefighting field piping systems.

Grooved end pipe

Plain end

A plain end pipe is a pipe that has been cut at 90° perpendicular to the pipe run. The reason pipe would be specified as plain end rather than beveled end is when the pipe will be used in a Socket Weld connection or for use with a Slip-on Flange.


Abbreviations

Common abbreviations for the types of pipe ends are as follows. In general, these are used to describe pipe Nipple and Coupling on drawings.

  • Bevel End (BE)
  • Bevel Both Ends (BBE)
  • Bevel Large End (BLE)
  • Bevel One End (BOE)
  • Bevel Small End (BSE)
  • Bevel for Welding (BFW)
  • Buttweld End (BE)
  • End of Pipe (EOP)
  • Flange One End (FOE)
  • Plain End (PE)
  • Plain Both Ends (PBE)
  • Plain One End (POE)
  • Thread End (TE)
  • Thread Both Ends (TBE)
  • Thread Large End (TLE)
  • Thread One End (TOE)
  • Thread Small End (TSE)
  • Threads Only (TO)
  • Threads per Inch (TPI)

ASME standars




Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.



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