Pipe Coupling VS Olets

What is a pipe coupling?

A coupling (or coupler) (used in piping or plumbing) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed or soldered (copper, brass etc.) together.
20170531105852 27297 - Pipe Coupling VS Olets
Alternatively it is a short length of pipe with two female National pipe threads (NPT) (in North American terms, a coupler is a double female while a nipple is double male) or two male or female British standard pipe threads.
If the two ends of a coupling are different (e.g. one BSP threaded and one NPT threaded), then it is usually referred to as an adapter. Another variation is one plain socket and one threaded socket. Yet another variation would be 3/4″ NPT to 1/2″ NPT.
When the two ends use the same connection method but are of a different size, the terms reducing coupling or reducer are used.

A pipe coupling is any fitting or device used to join two or more pipes in such a way that continuity is maintained between them. The body of a pipe coupling is typically made of the same or similar materials as those used to construct the pipes it joins. They may be rigid or flexible depending on the amount of movement the pipe is subjected to and may per permanent or removable fixtures. A pipe coupling can be stepped or reduced in internal diameter to accept pipes of different sizes, be T or cross shaped to join more than two pipes, or angled to form bends. Pipe couplings may also include peripheral features or equipment such as inspection openings, flow meters, or valves.

Most pipe installations require that several lengths of pipe be joined together or cut to facilitate changes in direction and crossing of obstacles. This requires a fairly quick method of connecting the sections while maintaining the integrity of the pipes in the process. These couplings may be permanent by nature or, if possible disassembly is desirable, of a removable design. Permanent pipe couplings generally make use of soldering or brazing in the case of steel or copper pipes or adhesives in the case of PVC pipes. These permanent joints, if correctly installed, offer excellent rigidity and sealing characteristics where no future changes in the piping are foreseen.

Removable pipe couplings are most often of a threaded design which allows them to be screwed onto the pipes to be joined. The most simple of these is a basic pipe section slightly larger than the pipes to be joined and cut with an internal thread. The ends of the pipes are also threaded, and the coupling is simply sealed with hemp or sealing tape and screwed onto both pipes. More complex removable pipe couplings are of a two-part design where one part is attached to each pipe and then screwed together to complete the joint. These types of couplings are often used on high pressure copper gas pipes and flexible hydraulic or pneumatic hoses.

pipe coupling is also often used to facilitate changes of pipe routing, crossing of obstacles, and penetration of walls. These couplings are typically elbow or U shaped but may include several variants featuring different angles of deflection. Step-down or reduction pipe couplings featuring different end diameters are used to join pipes of dissimilar sizes. Adaptor fitting may also be used to join pipes of different materials and feature separate end fittings suitable for both materials. Where more than two pipes are to be joined Y, T, or cross shaped couplings are common methods of achieving the joints.

Pipe couplings may also include other features such as inspection or maintenance access points. These are typically screw-on caps that allow for visual inspections or the insertion of rods used to remove blockages. Flow meters and other analytical attachments are frequently built into a pipe coupling to ease installation. Pipe couplings may also include mechanisms such as shut-off and pressure release valves.

What are Olets?

The pipe olet is also called the pipe socket, the saddle, and the saddle pipe joint. Reinforced pipe fittings mainly used for olet connection, instead of using reducer tee, reinforcing plate, reinforcing pipe section and other pipe connection types, it is safe and reliable, reduces cost, simple construction, improves medium flow channel, series standardization, and convenient design and selection. Such outstanding advantages, especially in high pressure, high temperature, large diameter, thick wall pipelines, are increasingly used, replacing the traditional olet connection method.
The main body of the olet is made of high-quality forgings, and the materials are the same as the pipe materials, such as carbon steel, alloy steel and stainless steel. Both the olet and the main pipe are welded, and the connection of the olet or other pipe (such as short pipe, wire plug, etc.), instrument and valve has three types: butt welding connection, socket welding connection and screw connection. Commonly used manufacturing standards for olet stations are MSS SP-97, GB/T19326 and other standards.

Available Olet Fittings are :

  1. Weldolet (WEL)
  2. Threadolet (TOL)
  3. Sockolet (SOC)
  4. Elbolet (ELO)
  5. Insert Weldolet
  6. Brazolet
  7. Coupolet
  8. Nipolet
  9. Flexolet
  10. Latrolet (LOL)
  11. Sweepolet
  12. Weldoflange
  13. Nipoflange

Pipe Coupling VS Olets

pipe coupling vs olets - Pipe Coupling VS Olets

  1. The olet table is used to open the olet on the main pipe wall; the connection form with the main pipe is welding, and the connection mode with the olet may be butt welding, socket welding or thread; the main pipe and the olet connected by the olet table are vertical or oblique Cross relationship.
  2. The pipe Coupling is used for the connection at the pipe joint of the two pipes; the connection mode of the two pipes to the pipe Coupling is socket welding or thread; the two pipes connected by the pipe Coupling have the same axial direction.
  3. For pipe diameter
  • Sockolets: refers to the socket welding pipe table for pipe diameter DN15~DN40, see standard MSS-SP-97
  • Weldolet: refers to the butt welding pipe table for pipe diameter DN50 or above, see standard MSS-SP-97
  • Threadolet: Threaded pipe stand for pipe diameter DN15~DN40, see standard MSS-SP-97
  • Full coupling, socket welding, for pipe diameter DN15~DN40, see standard ASME B16.11, GB/T 14383-2008
  • Half coupling, socket welding, for pipe diameters DN15~DN40, see standard ASME B16.11, GB/T 14383-2008

The olet station is widely used in foreign countries in recent years. The reinforcing pipe fittings used for olet connection replace the traditionally used reducer tee, reinforcing plate and reinforced pipe section, etc., which are safe and reliable, reduce the cost; simple construction Improve the medium flow channel; serialization standardization, convenient design and other outstanding advantages, especially in high pressure, high temperature, large diameter, thick wall pipe.

Source: China Pipe Coupling Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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Please notice that you might be interested in the other technical articles we’ve published:

  • How to get high quality pipe nipples

  • The difference between pipe nipple and pipe coupling

  • What is a Pipe Nipple

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