Branch Connection Fitting

Written by Jerry Ratzlaff on . Posted in Pipe Fittings

Branch connections are not just tee's and lateral's, they are also weldolets. Weldolets® are welded branch connections that are designed to match or exceed the schedule of the pipe used. Each is marked with an outlet size and the pipe sizes that it can be welded to. If stamped 5-3x3/4" it will have an outlet size of 3/4" and fit pipe sizes 3", 3 1/2", 4", 5" and having a maximum gap between the pipe and olet of 1/32" for the largest size.

If you're looking for other types of branch connections besides O'lets, click here.

Whatever your pipe size, an olet can be found to do the job. 4 inch and smaller are designed to fit numerous sizes of pipe, 5 inches and larger are designed for each specific size of pipe. A flat base is available for connecting to pipe caps and vessel heads.

ThreadedSocket
  • Class 3000 - for use with Sch. 80 pipe.
  • Class 6000 - for use with Sch. 160 pipe.
  • Class 3000 - for use with Sch. 80 pipe.
  • Class 6000 - for use with Sch. 160 pipe.

Unless otherwise specified, the following trademarked names are registered to Bonney Forge. These fittings may be available for sale under different names. It is up to the user to ensure that the fitting meets applicable codes, such as ANSI/ASME B16.9, ANSI/ASME B16.25 or MSS SP-97.

Abbreviations

  • ELO - elbolet
  • LOL - latrolet
  • SOL - socolet
  • TOL - threadolet
  • WOL - weldolet

Types of branch connections

Threaded Elbolet on an elbowThreaded Elbolet on an elbow

Elbolet

An Elbolet® is used on 90° long radius elbows, short radius elbows and can be used on 180° returns. However, an Elbolet on a short radius elbow is not used often. It typically is used for Thermowell and instrumentation connections but can be used as a drain connection when room isn't available for using a Weldolet. The Elbolet is available with buttweld, socketweld or threaded connections.

For dimensions and available sizes of the Elbolet, view the datasheet.

 

 

Sockolet

A Sockolet® is the same basic design as a "weldolet" or "threadolet" where the major difference is that a Sockolet has a socket for welding versus a buttweld connection that a Weldolet has. This makes a 90° branch and comes in full size or reducing for a straight piece of pipe. Sockolets are available in Class 3000, 6000 and 9000 for high pressures.

For dimensional information and available sizes, view the Sockolet datasheets:

DSC05310Threadolet

A Threadolet® is the same basic design as a "weldolet." However the main difference is the fitting has a female threaded connection to mate to the branch connection. This makes a 90° branch and comes in full size or reducing for a straight piece of pipe.

Typically, it is in the size range of 1/2" to 2" and is welded over a hole either drilled or burned in the pipe.

For dimensional information and available sizes, view the Threadolet datasheets:

An installed WeldoletAn installed Weldolet

Weldolet

A Weldolet® makes a 90° branch connection and - comes in full size or reducing for a straight piece of pipe. A weldolet is designated by the run length by the branch length. For example a 6-inch weldolet on a 10-inch pipe would be a 10x6 Weldolet. A weldolet is designed to minimize stress concentrations and provide integral reinforcement without the need for reinforcing the weld.

For dimensional information and available sizes, view the Weldolet datasheets:

Specialty Olets

Brazolet

A Brazolet® is a fitting that resembles a Weldolet and is designed for use on KLM pipe (ASTM_B88) and iron pipe size ('''IPS''') brass or copper tubing. It is available with socket or threaded connections.

Coupolet

A Coupolet® is a fitting that is designed for use in fire protection sprinkler systems and other low pressure piping applications. It comes with NPT female threads for 300# service.

Expanded Olet

A Expanded Olet® is designed to be used when the branch pipe is larger than run pipe. It can replace the need for two fittings a tee and concentric reducer.

Flanged Olet

A Flanged Olet® is a combination of a Weldolet® and flange, available in classes 150 thru 2500 and any combination flange type.

Flexolet

A Flexolet® and Weldolet® are basically the same but with one difference. The Flexolet® has a straight through bore and the Weldolet® has a tapered bore.

Insert Weldolet

A Insert Weldolet® is designed to be welded flush with the pipe and can replace a reducing tee or reinforcing plate.

Latrolet

A Latrolet® is similar to a Weldolet that makes a 45° reducing branch on a straight run of pipe. End connections of a Latrolet can be buttwelded, socket welded or threaded.

Nipolet

A Nipolett® is a Weldolet® with a nipple and comes with either a plain or threaded end. It's a one piece fitting that can be used for drains, vents or taps.

Sweepolet

A Sweepolet® is almost like a pipe saddle but has been manufactured in such a way as to minimize pipe stresses and stress concentration factors. The weld is able to be inspected by typical weld inspection techniques such as radiography and ultrasound inspections.

For dimensional information on the Sweepolet, view the datasheet.

How to Order

  • Specify Size
    • Outlet size
    • Run or Header
  • Specify Style
    • Weldolet (buttweld)
    • Thredolet (threaded)
    • Sockolet (socket)
    • Elbolet, Latrolet, Sweeploet, Insert Weldolet, Nipolet, ect.
  • Indicate Class or Schedule/Pipe Wall
    • Class 3000 or 6000 - Threaded or Socket
    • STD, XS, Sch 160/XXS, ect. - Buttweld
  • Select Material
    • Carbon steel
    • Stainless steel
    • Other
  • Specify Design Code (if available)

Standards

ASME Standards

  • ASME B16.9 - Factory-Made Wrought Buttwelding Fittings

MSS Standards

  • MSS SP-97 - Integrally Reinforced Forged Branch Outlet Fittings - Socket Welding, Threaded, and Buttwelding End