Forged Olets (Weldolet, Threadolet, Sockolet, Elbolet, etc) are used to create an outlet from a run pipe (the “header size”) to a branch pipe (the “outlet size”). Branch fittings are manufactured by forging steel and may have welded or threaded connections. Forged Olets have been introduced on the market by Bonney Forge more than 70 years ago, and have become, since then, very popular for reinforced pipe branches.
Weldolet, Threadolet, Sockolet fittings are manufactured in a wide range of sizes, types, nominal diameters, and, classes, and in a wide range of materials such as carbon steel, stainless steel, chrome-moly, and nickel alloys.
The standard MSS SP 97 covers the dimensions, the finishing, the tolerances, the testing methods and procedures, the marking, the material grades, and the minimum tensile strength requirements for 90-degrees integrally reinforced forged branch outlet fittings (welded and threaded). Branch connections manufactured to the MSS SP 97 standard have to ensure a reinforced joint between two pipes.
Let’s now review some of the most common types of branch connections.
A Weldolet is a popular branch connection which falls under the buttweld fittings family.
When using a Weldolet, the branch connection is made by welding the fitting onto the outlet of the run pipe (Weldolet has beveled ends at both sides). The other end of the Weldolet can then be welded with the branch pipe and create the 90-degrees reinforced pipe deviation.
A Weldolets minimizes the stress concentration on the branched connection and provides an integral reinforcement.
Weldolets can have the same or a higher, schedule than the schedule of the run pipe.
Weldolets are available in multiple forged material grades, as ASTM A105, A350, A182. Click on this link to look at the weldolet dimensions (center of the run to weldolet face, equal and reducing weldolet sizes and heavey wall weldolets).
How to install a Weldolet: Bonney Forge
A Sockolet is similar to a Weldolet, with the difference that the branched pipe sits, and can be welded, on the socket present in the inner part of the fittings. Fillet welds are used to connect the branch pipe to a Sockolet, instead of a butt welding connections (used for Weldolet). Similarly to a Weldolet, the fitting is welded on the run pipe.
SOCKOLET VS. WELDOLET
Sockolets are classified as “socket fittings” and are available in classes 3000#, 6000# and 9000#.
They are used for 90 degrees branched reinforced pipe connections and can be size on size (the bore of the fitting matches the bore of the run pipe) or reducing (the fitting has a smaller bore size).
Sockolet class 3000 Size on Size
|Outlet Size (NPT)||A||B||C||D||E||Approx. Weight (lb)|
|3/4||1 1/16||1 5/8||1 3/16||0.824||15/32||0.25|
|1||1 5/16||2||1 7/16||1.049||23/32||0.45|
|1 1/4||1 5/16||2 3/8||1 3/4||1.380||9/16 0.65|
|1 1/2||1 3/8||2 7/8||2||1.610||21/32||0.85|
|2||1 1/2||3 1/2||2 9/16||2.067||15/16||1.40|
|2 1/2||1 9/16||4 1/16||3||2.469||3/4||2.25|
|3||1 3/4||4 13/16||3 11/16||3.068||15/16||3.75|
|3 1/2||1 11/16||5 3/8||4 7/16||3.548||11/16||4.30|
|4||1 7/8||6 1/16||4 3/4||4.026||1 1/16||6.60|
|5||2 7/16||7 1/4||5 1/4||5.047||1||9.00|
|6||2 11/16||8 11/16||6 1/16||6.065||1 3/16||15.50|
- Class 3000 to be used with schedule 80 pipes
- Dimensions and tolerances in accordance with ASME B16.11 and MSS SP-97
- Flat sockolets are used on welding caps, elliptical heads and flat surfaces
- Each outlet size is available to fit any run curvature.
Sockolet class 6000 Size on Size
|Outlet Size (NPS)||A||B||C||D||E||Approx. Weight (lb)|
|1/2||1 1/4||1 23/32||3/4||0.466||7/8||0.50|
|3/4||1 7/16||1 61/64||1||0.614||7/8||0.80|
|1||1 9/16||2 7/16||1 5/16||0.815||15/16||1.30|
|1 1/4||1 5/8||2 23/32||1 1/2||1.160||13/16||1.60|
|1 1/2||1 11/16||3 1/4||1 15/16||1.338||7/8||2.00|
|2||2 1/16||4 1/32||2 3/4||1.689||1 3/16||5.15|
- Class 6000 to be used with schedule 160 pipe.
- Dimensions and tolerances in accordance with ASME B16.11 and MSS SP-97
- Flat sockolets are used on welding caps, elliptical heads and flat surfaces.
- Outlet combinations fit a number of run pipe sizes, and fittings are marked accordingly
A Threadolet is similar to a Weldolets, but the branched pipe is in this case screwed on the fitting and not welded. The threaded end is generally of the NPT type (National Pipe Thread, the American standard).
Thredolets belong to the family of “threaded fittings” and are available in classes 3000# and 6000#. A Threadolet is used, generally, to branch the run pipe with a small diameter branch pipe.
Latrolets are used to branch a pipe at 45 degrees. They are available with butt weld connections to meet demanding reinforcement requirements or with socket weld/threaded connections in classes 3000# or 6000#.
Elbolets are used with 90 or 180 degrees long radius and short radius (more rarely) elbows for thermowell and instrumentation connections or as a drain connection when there is too little space for using a Weldolet.
Elbolets are available with butt weld connections or with socket weld/threaded connections in classes 3000# or 6000#.
|Nominal Size of Elbow (NPS)||Outlet Size (NPS)||CL 3000 Threaded and Socket Weld
Sch. Standard and XS Buttweld
|CL 6000 Threaded and Socket Weld
Sch. 160 and XXS Buttweld
|36 – 3/4||1/4||1 1/2||1 19/32||1 1/2||1 19/32|
|36 – 3/4||3/8||1 1/2||1 19/32||1 1/2||1 19/32|
|36 – 3/4||1/2||1 1/2||1 19/32||1 23/32||1 7/8|
|36 – 1||3/4||1 23/32||1 7/8||2 1/4||2 1/4|
|36 – 2||1||2 1/4||2 1/4||2 7/8||2 1/2|
|36 – 2||1 1/4||2 7/8||2 1/2||3 1/8||2 11/16|
|36 – 2||1 1/2||3 1/8||2 11/16||4 3/16||3 1/4|
|36 – 3||2||4 3/16||3 1/4||–||–|
|*2 1/2||4 3/16||3 1/4||bw only||bw only|
|*3||5 1/16||3 7/8||bw only||bw only|
|*4||6 5/8||4 13/16||bw only||bw only|
|*6||9 3/8||6 1/2||bw only||bw only|
|*8||13 5/16||8 1/16||bw only||bw only|
|*10||17 1/32||10 3/8||bw only||bw only|
|*12||19 5/8||11 1/8||bw only||bw only|
- Class 3000 to be used for schedule 80 pipes
- Class 6000 to be used for schedule 160 pipes
- Dimensions and tolerances acc. to ASME B16.9, ASME B16.25 and, MSS SP-97.
- Dimensions and tolerances in accordance with ANSI/ASME B16.11
- Threaded ends in accordance with ANSI/ASME B1.20.1
Nipolets are used for valve take off, drains and vents and are manufactured in lengths between 3 1/2 to 6 1/2 inches and for XS and XXS schedules. A Nipolet is welded onto the run pipe and are manufactured with socket weld or threaded outlets on the branched side.
Sweepolets are contoured, integrally reinforced, butt weld branch connections suited for low stresses and long fatigue service. The weld on the run pipe side can be easily inspected with radiographic examination (RX or RT), ultrasounds (UT) and other non-destructive testing methods.
HOW TO ORDER WELDOLET, THREADOLET, SOCKOLET
The following indications are necessary when ordering a branch connection:
- Fitting type
- Weldolet (for buttweld connections)
- Thredolet (for threaded connections)
- Sockolet (for socket weld connections)
- Elbolet, Latrolet, Sweeploet, Insert Weldolet, Nipolet, Brazolet and so on
- Bore sizes
- Outlet size
- Run or Header
- Schedule (butt weld branch connections) and pressure rating (threaded and socket weld connections)
- Class 3000 or 6000 – Threaded or Socket
- Schedule STD, XS, 160, XXS
- Material Grade
- Carbon steel
- Stainless steel
- Nickel Alloys
- Design Code: ASME B16.9/MSS SP 97
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