How to install a Weldolet: Bonney Forge

 

SOCKOLET

Sockolet MSS SP97

A Sockolet is similar to a Weldolet, with the difference that the branch pipe is connected to the run pipe, via the fitting, with a socket weld connection as per ASME B16.11. Likewise Weldolets, Sockolets are used to make a 90-degree pipe branch. Sockolets may be “size on size” or “reducing”.

Fillet welds are used to connect the branch pipe to the branch side of the Sockolet. On the pipe run side, a Sockolet requires a welded connection.

What is the difference between a Sockolet and a Weldolet?

Sockolets belong to the “socket fittings” family and are available in classes 3000#, 6000# and 9000#, whereas Weldolets are buttweld fittings. Sockolets are used for lower pressure applications, and smaller pipe diameters, than Weldolets.

 

THREDOLET

Threadolet MSS Sp97

Thredolets are used for low-pressure 90-degree pipe branches. The branch pipe is screwed on the Thredolet, which is welded on the run pipe. The threading is generally of the NPT type and conforms to the ASME B1.20.1 specification.

Thredolets belong to the “threaded fittings” family and are available in classes 3000# and 6000#. Threadolets are used for smaller pipe sizes and low-pressure applications.

 

 

LATROLET

Latrolet branch connection

Latrolets 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#.

ELBOLET

Elbolet fitting

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#.

 

NIPOLET

Nipolet

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 is manufactured with socket weld or threaded outlets on the branch pipe side.

SWEEPOLET

Sweepolet MSS SP97
Sweepolets are contoured, integrally reinforced, buttweld branch fittings used for low stress and long fatigue service. The welded connection on the run pipe side can be easily inspected with radiographic examination (RX or RT), ultrasounds (UT) and other non-destructive tests.

OLETS DIMENSIONS

WELDOLET

The dimensions of Weldolets are explained in this article.

SOCKOLET DIMENSIONS

Sockolet class 3000 “Size on Size”

Sockolets dimension1Sockolets dimension 2

Outlet Size (NPT) A B C D E Approx. Weight (lb)
1/2 1 1 3/8 15/16 0.622 17/32 0.15
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

Notes: 

  • 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”

Sockolets dimension1Sockolets dimension 2

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
    Notes:

  • 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

ELBOLET DIMENSIONS

Butt weld elbolet

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
C E C E
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
Order
to
Specific
Elbow
Sizes
*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
Notes:
  • 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

HOW TO ORDER BRANCH FITTINGS

Suppliers of Weldolets, Thredolets, Sockolets, and other branch fittings need the following information to identify the needed product:

  • Header run pipe size (which is generally expressed as a range of possible sizes, example 36-22)
  • Branch pipe size (the NPS of the connecting pipe to the run pipe, example 6 inches)
  • Branch pipe schedule (which can be STD, XS, 160, XXS) for buttweld types of connections (rating shall be provided for socket weld and NPT threaded Olets)
  • Style of branch fitting (Weldolet, Thredolet, Nipolet, Sockolet, etc)
  • Material Grade (example A105, A350 LF2, A182 F304)


EXAMPLE: 36-22 | 6 INCH Sch. STD | Weldolet | ASTM A105

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