Weldolet

Weldolet

A Weldolet is a type of pipe fitting used for branch connections on pipes.

What does MSS SP-97 mean?

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It is designed to fit over the run pipe and be welded onto it, with a branch pipe connected to the other end. This creates a strong and permanent connection between the pipes, making it an efficient and durable solution for piping systems.

A Weldolet is the most common type of branch connection, typically welded onto the outlet pipe. The ends are beveled to facilitate the welding process, classifying the Weldolet as a butt-weld fitting. Weldolets are crafted to reduce stress concentrations and offer integral reinforcement.

Branch connection fittings encompass more than just tees and laterals; they also include Weldolets. Weldolets are welded branch connections designed to match or surpass the schedule of the pipe used. Each is labeled with an outlet size and the pipe sizes it can be welded to. For instance, if marked as 5-3×3/4", it has an outlet size of 3/4" and fits pipe sizes 3", 3 1/2", 4", 5", with a maximum gap of 1/32" for the largest size. Regardless of your pipe size, there is an Olet available for the job. Olets with a size of 4 inches or smaller are designed to fit various pipe sizes, while those with a size of 5 inches and larger are designed for specific pipe sizes. A flat base is available for connecting to pipe caps and vessel heads.

Stainless steel butt welding weldolet

Stainless steel butt welding weldolet

A Weldolet creates a 90° branch connection and is available in full size or reducing options for a straight section of pipe. The designation of a Weldolet is based on the run length and the branch length. For instance, a 6-inch Weldolet on a 10-inch pipe would be labeled as a 10x6 Weldolet. Weldolets are engineered to minimize stress concentrations and provide integral reinforcement without the need for additional weld reinforcement.

Weldolet is olet pipe fittings that can supply an outlet from a larger pipe to a smaller pipe in piping & tubing systems. The Weldolet Forged Pipe Fittings are the most common type of olet branch connection fittings which is ideal for high pressure and high-temperature applications. ASME B16.11 Weldolet can easily be installed on run pipe and welded with buttweld techniques.

Weldolet Buttweld Pipe Fittings expedite installation and demand less space. We produce these branch connection pipe fittings, known as olets, in various material grades such as Stainless Steel, Carbon Steel, Alloy Steel, Nickel Alloy, and more. Weldolet pipe fittings find significant utility in lengthy connection pipe fittings within various industries.

An installed weldolet

An installed weldolet

Weldolet installation

Weldolet installation involves the following key steps:

  1. Preparation: Ensure the main pipe is clean and free of any contaminants. Verify that the Weldolet and the main pipe are of compatible materials.
  2. Cutting: Cut an opening in the main pipe where the Weldolet will be installed. The size of the opening should match the Weldolet's outlet size.
  3. Beveling: Bevel the edges of the opening and the Weldolet to facilitate welding and ensure a smooth transition.
  4. Fitment: Position the Weldolet over the opening, ensuring it aligns properly. The beveled edges should match, providing a suitable welding surface.
  5. Tack Welding: Tack weld the Weldolet in place. Double-check alignment and measurements before proceeding with full welding.
  6. Welding: Complete the welding process, ensuring a secure and leak-free joint. Follow welding procedures and standards for the specific materials used.
  7. Inspection: Conduct a visual inspection to ensure the weld is uniform and free from defects. Non-destructive testing may be performed for critical applications.
  8. Post-Weld Treatment: If required, perform any post-weld treatments such as stress relieving or heat treatment according to material specifications.
  9. Testing: Conduct pressure testing or other relevant tests to verify the integrity of the installed Weldolet and the overall pipeline.

Weldolet dimensions

Integrally Reinforced Forged Branch Outlet Fittings – Socket Welding, Threaded, and Buttwelding Ends.

MSS SP-97

Fittings manufactured to this Standard Practice are designed to make a fully reinforced branch connection in accordance with applicable piping code requirements, when attached, at an opening in a run pipe by means of a full penetration weld.

This classification refers to its beveled outlet that is butt-welded to the branch pipe during installation. The weldolet is ideal for replacing a tee on 90-degree branches with a reinforced connection that protects the branch pipe by reducing stress concentration due to its shape and size.

pressure NPS A B C D
STD 1/2″ 19.05 34.93 23.81 15.88
STD 3/4″ 22.23 41.28 30.16 20.64
STD 1″ 26.99 50.8 36.51 26.19
STD 1 1/4″ 31.75 60.3 44.45 34.93
STD 1 1/2″ 33.34 73 50.8 41.28
STD 2″ 38.1 88.9 65.09 52.39
STD 2 1/2″ 41.28 103.19 76.2 61.91
STD 3″ 44.45 122.24 93.66 77.79
STD 3 1/2″ 50.8 136.53 98.43 90.49
STD 4″ 50.8 152.4 120.65 101.6
STD 5″ 57.15 180.98 141.29 128.59
STD 6″ 60.3 215.9 169.86 153.99
STD 8″ 69.85 263.53 220.66 201.61
STD 10″ 77.79 319.09 274.64 254
STD 12″ 85.73 377.83 325.44 304.8
STD 14″ 88.9 409.58 357.19 336.55
STD 16″ 93.66 463.55 407.99 387.35
STD 18″ 103.19 527.05 473.08 438.15
STD 20″ 117.48 585.79 509.59 488.95
STD 24″ 136.53 708.03 638.18 590.55
XS 1/2″ 19.05 34.93 23.81 15.88
XS 3/4″ 22.23 41.28 30.16 20.64
XS 1″ 26.99 50.8 36.51 26.19
XS 1 1/4″ 31.75 61.91 44.45 34.93
XS 1 1/2″ 33.34 73 50.8 41.28
XS 2″ 38.1 88.9 65.09 52.39
XS 2 1/2″ 41.28 103.19 76.2 61.91
XS 3″ 44.45 122.24 93.66 77.79
XS 3 1/2″ 50.8 136.53 98.43 90.49
XS 4″ 50.8 152.4 120.65 101.6
XS 5″ 57.15 180.98 141.29 128.59
XS 6″ 77.79 225.43 169.86 153.99
XS 8″ 98.43 269.88 220.66 193.68
XS 10″ 88.9 327.03 265.11 254
XS 12″ 100.01 385.76 330.2 304.8
XS 14″ 104.78 423.86 363.54 330.2
XS 16″ 112.71 479.43 419.1 381
XS 18″ 119.06 536.58 473.08 431.8
XS 20″ 127 593.73 528.64 482.6
XS 24″ 139.7 708.03 638.18 584.2

Fittings may be made to special dimensions, size, shape, tolerances, or of other wrought material by agreement between the manufacturer and the purchaser.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

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