What is a weldolet?

What is a weldolet?

A Weldolet has beveled ends at both ends and is, therefore, welded onto the run pipe on one side and onto the branch pipe on the other side. Weldolets are used to create a 90-degrees (reinforced) pipe branch. The shape of the weldolet ensures little stress concentration on the branched pipe, providing an integral reinforcement.
On the branch pipe side, Weldolets may have the same schedule of the run pipe or a higher schedule. It Comes in full size or reducing size (Full size is when you take branch of the same size as run pipe size for example 3 inch to 3 inch. And reducing size is when branch size is less than run pipe size 3 inch to 1 inch)
Weldolet’s end is suited for the butt welding connection.
Weldolet branch connection fittings are used for a variety of metal pipes such as stainless steel, chrome-moly and several other alloys.

Schedule of both the Run and Branch
Weldolet welding technique
Weldolet Dimensions
Half coupling, welded branch pipe, and weldolet
How to order a weldolet

Specifying the Schedule of both the Run and Branch

Generally the schedules of the run pipe and branch pipe are identical and thus specification of the equivalent schedule Weldolet assures the proper fitting being used.

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Example:
16″ Standard weight x 6″ Standard weight is specified as a 6″ standard weight fitting.
Where the schedule of the run is greater or less than the schedule of the branch, it is essential that both schedules be specified since (a) The Weldolet’s reinforcing characteristics are a function of the run pipe wall thickness, which in turn designates the schedule of the basic Weldolet fitting to be used;(b) The wall thickness of the outlet or branch end must match the wall thickness of the branch pipe.
Example:
16″ Extra strong x 6″ Standard weight
16″ Standard weight x 6″ Extra strong
Special care is suggested to avoid confusing schedule 40 and standard weight as being identical (above 10″ schedule 40 is heavier) and schedule 80 and extra strong (above 8″ schedule 80 is heavier).
Example:
8″ Schedule 80 x 4″ Schedule 80 fitting or extra strong fitting.18″ Schedule 80 x 4″ Schedule 80 is a considerably heavier fitting, because the reinforcement is for 18″ schedule 80 pipe with a wall thickness of approximately 1″.
The Weldolet is available in standard code designs for all combinations of run wall thicknesses up through 3.1/2″ thickness and branch wall thicknesses up through double extra strong. Designs for thicknesses greater than these can be developed on request.

The pressure level of the olet is determined by the wall thickness of the main pipe. When the wall thickness of the main pipe and the branch pipe are different, the wall thickness of the main pipe and the branch pipe should be specified. The main wall thickness is used to determine the olet pressure level Basis. The side wall thickness of the branch pipe is consistent with the wall thickness of the branch pipe.

Weldolet welding technique

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Welding set up

Ready to weld: Every fitting is shaped to fit the pipe and self-aligning.
The outlet is machine-beveled for quick easy butt-welding of branch pipefor shop or field fabrication.
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Lay out: the template is inside of the fitting.
Cut hole: the hole in the run pipe on reducing sizes can be cut out either before or after the fitting is welded on. The hole can be cut with drill or a hole saw. Welding the fitting to run pip prior to cutting the hole helps prevent distortion of the run pipeand can be done generally on outlet size over two inches.

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Space for welding: The weldolet is raised off the run pipe to establish proper weld gap by placing spacers, e.g. welding rods under the fitting. This provides a uniform welding gap between the curvature of the run and base of fitting.

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Tack weld: The base joint is tack welded, preferably at four points, each half way between the crotch and skirt sections of fitting. The spacers are the removed.

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Longitudinal section: Wide bases or footings at crotch section distribute internal and external stresses. Gradual changes of section eliminate stress concentration. Funnel shaped opening provides improved flow direction.

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Transverse section: Note the blending of the skirt section weldolet to the run pipe to avoid abrupt change in intersection. Throat of weld at this point is designated by the welding bevel.

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Stringer bead: The stringer bead is applied completely around the base of the fitting. The established weld gap assures full penetration.

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Reinforcing beads: Reinforcing welds should be made at the crotch bevel areas of the fitting to provide maximum weld at the crotch tapering to minimum at the skirt. Particular are should be taken to weld only the bevel portion of the fitting. This eliminates the unnecessary use of continuous passes and prevents the erroneous practice of welding up to the rib on the skirt portion of fitting. A continuous cover bead should be added to fill the bevel and provide a smooth tapered weld.

Welding sequence

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Especially note

When using the charts in MSS SP-97 when the pipe wall schedule actually being used is heavier than listed in the chart you need to use the next higher chart dimensions. This is based on on Table 1 and note (a) where since our run pipe schedule is Sch 80 (wall thickness=0.938″) and not XS (wall thickness=0.500″) you need to use the SCH 160 class fittings and dimensions which means we need to use the105mm dimension. Purchase and Inspection materials should know this principle .

Multiple outlet headers requiring all full size openings are subject to distortion because of the large number of holes that have to be cut in close proximity to one another. To eliminate the possibility of distortion occurring when using weldolets in this type of installation we recommend that a strap be left in the center of the hole, by cutting out two half moon section (as shown in sketch). This strap acts as a support until after the weldolet has been installed and is then cut out.

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Weldolet welding often occurred issue: non-penetration
For 4″ and above, it could be welded at  both side, even there is some difficulty with back gouging and back welding. But for 3″ and blower, it is not accessible with back gouging and back welding, the reason is:

  • 1) The torch size welding at back side is impossible access, and sometimes the torch could not access the bevel well at some angle.
  • 2) The ID of weldolet and opening in run pipe has some deviation.
  • 3) The bevel curve of weldolet do not fit pipe well.

Once found non penetration, need to cutting off the weldolet, reweld it from the run pipe to achieve penetration as could as possible.  1~2 mm non-penetration is acceptable. If more than 2mm non-penetration, back side need be welded.
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Weldolet receive and inspection

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Alignment and tack weld

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Weldolet welding

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Weldolet Dimensions Charts

Weldolet – Dimensions for Run Center to Face of Olet Weldolet – Insert, ANSI, FCS Weldolet – Heavy Wall, ANSI, FCS
Weldolet – Size to Size and Flat, ANSI Sch STD, FCS Weldolet – Reducing and Flat, ANSI Sch STD, FCS Weldolet – Size to Size and Flat, ANSI Sch XS, FCS
Weldolet – Reducing and Flat, ANSI Sch XS, FCS Weldolet – Size to Size and Flat, ANSI Sch 160/XXS, FCS Weldolet – Reducing and Flat, ANSI Sch 160/XXS, FCS

Weldolet – Dimensions for Run Center to Face of Olet

This is for the weldolet dimensions L1, L2 and L3.
The root gap is not included in this dimension.
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Run Pipe Size (NPS) Pipe Schedule Number L Dimension Outlet Size
1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
3/8 STD L1 1 1
XS L2 1 1
1/2 STD L1 1 1/16 1 1/16 1 3/16 1 3/16
XS L2 1 1/16 1 1/16 1 3/16 1 3/16
S160 & XXS L3 1 1/2
3/4 STD L1 1 3/16 1 3/16 1 1/4 1 1/4 1 7/16
XS L2 1 3/16 1 3/16 1 1/4 1 1/4 1 7/16
S160 & XXS L3 1 5/8 1 3/4
1 STD L1 1 5/16 1 5/16 1 3/8 1 3/8 1 1/2 1 1/16
XS L2 1 5/16 1 5/16 1 3/8 1 3/8 1 1/2 1 11/16
S160 & XXS L3 1 3/4 1 7/8 2 1/8
1 1/4 STD L1 1 7/16 1 7/16 1 9/16 1 9/16 1 11/16 1 7/8 2 1/16
XS L2 1 7/16 1 7/16 1 9/16 1 9/16 1 11/16 1 7/8 2 1/16
S160 & XXS L3 1 15/16 2 1/16 2 5/16 2 9/16
1 1/2 STD L1 1 9/16 1 9/16 1 11/16 1 11/16 1 13/16 2 2 3/16 2 1/4
XS L2 1 9/16 1 9/16 1 11/16 1 11/16 1 13/16 2 2 3/16 2 1/4
S160 & XXS L3 2 1/16 2 3/16 2 7/16 2 11/16 2 15/16
2 STD L1 1 13/16 1 13/16 1 15/16 1 15/16 2 1/16 2 1/4 2 7/16 2 1/2 2 11/16
XS L2 1 13/16 1 13/16 1 15/16 1 15/16 2 1/16 2 1/4 2 7/16 2 1/2 2 11/16
S160 & XXS L3 2 5/16 2 7/16 2 11/16 2 15/16 3 3/16 3 3/8
2 1/2 STD L1 2 1/16 2 1/16 2 3/16 2 3/16 2 5/16 2 1/2 2 11/16 2 3/4 2 15/16 3 1/16
XS L2 2 1/16 2 1/16 2 3/16 2 3/16 2 5/16 2 1/2 2 11/16 2 3/4 2 15/16 3 1/16
S160 & xxs L3 2 9/16 2 11/16 2 15/16 3 3/16 3 7/16 3 5/8 3 7/8
3 STD L1 2 3/8 2 3/8 2 1/2 2 1/2 2 5/8 2 13/16 3 3 1/16 3 1/4 3 3/8 3 1/2
XS L2 2 3/8 2 3/8 2 1/2 2 1/2 2 5/8 2 13/16 3 3 1/16 3 1/4 3 3/8 3 1/2
S160 & XXS L3 2 7/8 2 7/8 3 3 1/4 3 1/2 3 3/4 3 15/16 4 3/16 4 5/8
3 1/2 STD L1 2 5/8 2 5/8 2 3/4 2 3/4 2 7/8 3 1/16 3 1/4 3 5/16 3 1/2 3 5/8 3 3/4
XS L2 2 5/8 2 5/8 2 3/4 2 3/4 2 7/8 3 1/16 3 1/4 3 5/16 3 1/2 3 5/8 3 3/4
4 STD L1 2 7/8 2 7/8 3 3 3 1/8 3 5/16 31/2 3 9/16 3 3/4 3 7/8 4
XS L2 2 7/8 2 7/8 3 3 3 1/8 3 5/16 3 1/2 3 9/16 3 3/4 3 7/8 4
S160 & XXS L3 3 3/8 3 1/2 3 3/4 4 4 1/4 4 7/16 4 11/16 5 1/8
5 STD L1 3 7/16 3 7/16 3 9/16 3 9/16 3 11/16 3 7/8 4 1/16 4 1/8 4 5/16 4 7/16 4 9/16
XS L2 3 7/16 3 7/16 3 9/16 3 9/16 3 11/16 3 7/8 4 1/16 4 1/8 4 5/16 4 7/16 4 9/16
S160 & XXS L3 3 15/16 4 1/16 4 5/16 4 9/16 4 13/16 5 5 1/4 5 11/16
6 STD L1 3 15/16 3 15/16 4 1/16 4 1/16 4 3/16 4 3/8 4 9/16 4 5/8 4 13/16 4 15/16 5 1/16
XS L2 3 15/16 3 15/16 4 1/16 4 1/16 4 3/16 4 3/8 4 9/16 4 5/8 4 13/16 4 15/16 5 1/16
S160 & XXS L3 4 7/16 4 9/16 4 13/16 5 1/6 5 5/16 5 1/2 5 3/4 6 3/16
8 STD L1 4 15/16 4 15/16 5 1/16 5 1/16 5 3/16 5 3/8 5 9/16 5 5/8 5 13/16 5 15/16 6 1/16
XS L2 4 15/16 4 15/16 5 1/16 5 1/16 5 3/16 5 3/8 5 9/16 5 5/8 5 13/16 5 15/16 6 1/16
10 STD L1 6 6 6 1/8 6 1/8 6 1/4 6 7/16 6 5/8 6 11/16 6 7/8 7 7 1/8
XS L2 6 6 6 1/8 6 1/8 6 1/4 6 7/16 6 5/8 6 11/16 6 7/8 7 7 1/8
12 STD L1 7 7 7 1/8 7 1/8 7 1/4 7 7/16 7 5/8 7 11/16 7 7/8 8 8 1/8
XS L2 7 7 7 1/8 7 1/8 7 1/4 7 7/16 7 5/8 7 11/16 7 7/8 8 8 1/8
14 STD L1 7 5/8 7 5/8 7 3/4 7 3/4 7 7/8 8 1/16 8 1/4 8 5/16 8 1/2 8 5/8 8 3/4
XS L2 7 5/8 7 5/8 7 3/4 7 3/4 7 7/8 8 1/16 8 1/4 8 5/16 8 1/2 8 5/8 8 3/4
16 STD L1 8 5/8 8 5/8 8 3/4 8 3/4 8 7/8 9 1/16 9 1/4 9 5/16 9 1/2 9 5/8 9 3/4
XS L2 8 5/8 8 5/8 8 3/4 8 3/4 8 7/8 9 1/16 9 1/4 9 5/16 9 1/2 9 5/8 9 3/4
18 STD L1 9 5/8 9 5/8 9 3/4 9 3/4 9 7/8 10 1/16 10 1/4 10 5/16 10 1/2 10 5/8 10 3/4
XS L2 9 5/8 9 5/8 9 3/4 9 3/4 9 7/8 10 1/16 10 1/4 10 5/16 10 1/2 10 5/8 10 3/4
20 STD L1 10 5/8 10 5/8 10 3/4 10 3/4 10 7/8 11 1/16 11 1/4 11 5/16 11 1/2 11 5/8 11 3/4
XS L2 10 5/8 10 5/8 10 3/4 10 3/4 10 7/8 11 1/16 11 1/4 11 5/16 11 1/2 11 5/8 11 3/4
24 STD L1 12 5/8 12 5/8 12 3/4 12 3/4 12 7/8 13 1/16 13 1/4 13 5/16 13 1/2 13 5/8 13 3/4
XS L2 12 5/8 12 5/8 12 3/4 12 3/4 12 7/8 13 1/16 13 1/4 13 5/16 13 1/2 13 5/8 13 3/4
Run Pipe Size (NPS) Pipe Schedule Number L Dimension 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3
Outlet Size
 Run Pipe Size (NPS) Pipe Schedule Number L Dimension Outlet Size
3 1/2 4 5 6 8 10 12 14 16 18 20 24
3/8 “STD L1
XS L2
1/2 STD L1
XS L2
S160 & XXS L3
3/4 STD L1
XS L2
S160 & XXS L3
1 STD L1
XS L2
S160 & XXS L3
1 1/4 STD L1
XS L2
S160 & XXS L3
1 1/2 STD L1
XS L2
S160 & XXS L3
2 STD L1
XS L2
S160 & XXS L3
2 1/2 STD L1
XS L2
S160 & XXS L3
3 STD L1
XS L2
S160 & XXS L3
3 1/2 STD L1 3-7/8
XS L2 3 7/8
4 STD L1 4 1/8 4 1/4
XS L2 4 1/8 4 1/4
S160 & XXS L3 5 9/16
5 STD L1 4 11/16 4 13/16 5 1/16
XS L2 4 11/16 4 13/16 5 1/16
S160 & XXS L3 6 1/8 6 1/2
6 STD L1 5 3/16 5 5/16 5 9/16 5 11/16
XS L2 5 3/16 5 5/16 5 9/16 6 3/8
S160 & XXS L3 6 5/8 7 7 7/16
8 STD L1 6 3/16 6 5/16 6 9/16 6 11/16 7 1/16
XS L2 6 3/16 6 5/16 6 9/16 7 3/8 8 3/16
10 STD L1 7 1/4 7 3/8 7 5/8 7 3/4 8 1/8 8 7/16
XS L2 7 1/4 7 3/8 7 5/8 8 7/16 9 1/4 8 7/8
12 STD L1 8 1/4 8 3/8 8 5/8 8 3/4 9 1/8 9 7/16 9 3/4
XS L2 8 1/4 8 3/8 8 5/8 9 7/16 10 1/4 10 1/16 10 5/16
14 STD L1 8 7/8 9 9 1/4 9 3/8 9 3/4 10 1/16 10 3/8 10 1/2
XS L2 8 7/8 9 9 1/4 10 1/16 10 7/8 10 11/16 11 1/16 11 1/8
16 STD L1 9 7/8 10 10 1/4 10 3/8 10 3/4 11 1/16 11 3/8 11 1/2 11 11/16
XS L2 9 7/8 10 10 1/4 11 1/16 11 7/8 11 11/16 12 1/16 11 15/16 12 7/16
18 STD L1 10 7/8 11 11 1/4 11 3/8 11 3/4 12 1/16 12 3/8 12 1/2 12 11/16 13 1/16
XS L2 10 7/8 11 11 1/4 12 1/16 12 7/8 12 11/16 13 1/16 12 15/16 13 3/16 13 11/16
20 STD L1 11 7/8 12 12 1/4 12 3/8 12 3/4 13 1/16 13 3/8 13 1/2 13 11/16 13 13/16 14 5/8
XS L2 11 7/8 12 12 1/4 13 1/16 13 7/8 13 11/16 14 1/16 13 5/16 14 3/16 14 3/8 15
24 STD L1 13 7/8 14 14 1/4 14 3/8 14 3/4 15 1/16 15 3/8 15 1/2 15 11/16 15 13/16 16 17 3/8
XS L2 13 7/8 14 14 1/4 15 1/16 15 7/8 15 11/16 16 1/16 15 15/16 16 3/16 16 3/8 16 1/16 17 1/2
Run Pipe Size (NPS) Pipe Schedule Number L Dimension 3 1/2 4 5 6 8 10 12 14 16 18 20 24
Outlet Size

Weldolet – Insert, ANSI, FCS

  • Dimensions and tolerances in accordance with ANSI/ASME B16.9, ANSI/ASME B16.25 and MSS SP-97.
  • Specifications for carbon steel forgings in accordance with ASTM A105.
  • This is a buttweld connection used for making 90 degree branching vessels.
  • “W” dimensions shown are maximum – depending on applications, at the time of order, these dimensions may be reduced. These dimensions are to be used for layout purposes to determine any possible spacing problems. In no way should these dimensions be used to pre-cut holes prior to welding. In all cases, the fittings should be used as the template to determine size of hole in run pipe.
  • Insert weldolet fittings are not available for size to size applications.

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Outlet Size (NPS) “A” Dimensions (Height above run pipe)
1-1/2 2 2-1/2 3 4 5 6 8 10 12 14 16 18 20 24
Std Wt Run Pipe 1.50 1.50 1.62 1.75 2.00 2.25 2.38 2.75 3.06 3.38 3.50 3.75 3.81 4 4.56
XS Run Pipe 1.50 1.50 1.62 1.75 2.00 2.25 3.06 3.87 3.69 4.06 3.81 4.19 4.38 4.69 5.50
.500″ to .750″ Thick Run Pipe 2.88 3.31 3.75 4.12 4.18 4.25 4.37 4.50 4.69 5.13 5.62 6.50
.750″ to 1.00″ Thick Run Pipe 3.22 3.38 3.75 4.34 4.62 4.84 5.10 5.25 5.88 6.50 6.75 7.62
1.00″ to 1.25″ Thick Run Pipe 3.38 3.50 4.00 4.50 4.88 5.00 5.38 5.50 6.00 6.50 7.00 8.00
1.25″ to 1.50″ Thick Run Pipe 3.62 3.87 4.25 4.69 5.16 5.31 5.68 5.81 6.44 6.50 7.56 8.72
Outlet Size (NPS)  “W” Dimensions (Max. O.D. of fitting – Max. size of hole)
1-1/2 2 2-1/2 3 4 5 6 8 10 12 14 16 18 20 24
Std Wt Run Pipe 3.50 4.25 4.88 5.69 7.00 8.06 9.71 11.71 14.00 16.32 17.56 19.75 22.00 24.00 29.00
XS Run Pipe 3.56 4.38 5.00 5.75 7.12 8.25 10.44 13.44 14.25 16.56 18.00 20.00 22.44 25.00 30.32

Weldolet – Heavy Wall, ANSI, FCS

  • Dimensions and tolerances in accordance with ANSI/ASME B16.9, ANSI/ASME B16.25 and MSS SP-97.
  • Specifications for carbon steel forgings in accordance with ASTM A105.
  • This is a buttweld connection used for making 90 degree branching for high pressure, high temperature piping and pressure vessels.
  • Each outlet size is available to fit any run curvature.

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Outlet Run Wall Thickness 3/4 1 1-1/4 1-1/2 1-3/4 2 2-1/4 2-3/4 3
Branch Pipe Size (NPS) A C A C A C A C A C A C A C A C A C
3 2 7/8 2.906 3 7/32 2.900 3 3/8 2.906 3 5/8 2.900 4 1/8 2.900 4 9/16 2.900 5 2.900 5 7/8 2.900 6 1/16 2.900
3 1/2 3 1/8 3.359 3 1/4 3.359 3 7/16 3 359 3 3/4 3.359 4 3/16 3.359 4 5/8 3.359 5 1/16 3.359 6 3.359 6 5/16 3.359
4 3 5/16 3.843 3 3/8 3.826 3 1/2 3.828 3 7/8 3.826 4 3/4 3.826 4 3/4 3.826 5 3/16 3.826 6 1/8 3.826 6 9/16 3.826
5 3 3/4 4.812 3 3/4 4.812 4 4.812 4 1/4 4.812 4 3/4 4.812 5 1/4 4.812 5 3/4 4.812 6 5/8 4.812 7 3/16 4.812
6 4 1/8 5.750 4 11/32 5.761 4 1/2 5.760 4 11/16 5.760 5 1/4 5.760 5 3/4 5.760 6 1/4 5.760 7 1/4 5.760 7 13/16 5.760
8 4 3/16 7.625 4 5/8 7.625 4 7/8 7.625 5 5/32 7.625 5 3/4 7.625 6 11/32 7.625 6 15/16 7.625 8 3/32 7.625 8 11/16 7.625
10 4 1/4 9.750 4 27/32 9.750 5 9.562 5 5/16 9.562 5 15/16 9.562 6 9/16 9.562 7 3/16 9.562 8 7/16 9.562 9 1/16 9.562
12 4 3/8 11.750 5 3/32 11.750 5 3/8 11.375 5 11/16 11.375 6 5/16 11.375 6 15/16 11.375 7 9/16 11.375 8 13/16 11.375 9 7/16 11.375
14 4 1/2 13 5 1/4 13 5 1/2 12.500 5 13/16 12.500 6 5/16 12.500 6 15/16 12.500 7 9/16 12.500 8 13/16 12.500 9 7/16 12.500
16 4 11/16 15 5 7/8 15 6 14.312 6 7/16 14.310 6 5/8 14.310 7 1/4 14.310 7 7/8 14.310 9 1/8 14.310 9 3/4 14.310
18 5 1/8 17 6 1/2 17 6 1/2 16.125 6 1/2 16.126 6 13/16 16.126 7 7/16 16.126 8 7/32 16.126 9 13/32 16.126 10 1/32 16.126
20 5 5/8 19 6 3/4 19 7 17.937 7 9/16 17.938 7 25/32 17.938 8 3/32 17.938 8 21/32 17.938 9 29/32 17.938 10 15/32 17.938
24 6 1/2 23 7 5/8 23 8 21.564 8 23/32 21.564 8 31/32 21.564 9 13/16 21.568 10 1/2 21.568 12 9/16 21.564 10 21/32 21.564

Weldolet – Size to Size and Flat, ANSI Sch STD, FCS

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Outlet Size (NPS) A B C D Approx. Weight (lb)
1/2 3/4 1 3/8 15/16 5/8 0.15
3/4 7/8 1 5/8 1 3/16 13/16 0.25
1 1 1/16 2 1 7/16 1 1/32 0.40
1 1/4 1 1/4 2 3/8 1 3/4 1 3/8 0.70
1 1/2 1 5/16 2 7/8 2 1 5/8 0.80
2 1 1/2 3 1/2 2 9/16 2 1/16 1.50
2 1/2 1 5/8 4 1/6 3 2 7/16 2.25
3 1 3/4 4 13/16 3 11/16 3 1/16 3.75
3 1/2 2 5 3/8 3 7/8 3 9/16 5.00
4 2 6 4 3/4 4 6.70
5 2 1/4 7 1/8 5 9/16 5 1/16 8.50
6 2 3/8 8 1/2 6 11/16 6 1/16 14.00
8 2 3/4 10 3/8 8 11/16 7 15/16 28.00
10 3 1/16 12 9/16 10 13/16 10 39.00
12 3 3/8 14 7/8 12 13/16 12 65.00
14 3 1/2 16 1/8 14 1/16 13 1/4 70.00
16 3 11/16 18 1/4 16 1/16 15 1/4 92.00
18 4 1/16 20 3/4 18 5/8 17 1/4 125.00
20 4 5/8 23 1/16 20 1/16 19 1/4 175.00
24 5 3/8 27 7/8 25 1/8 23 1/4 280.00
30 5 3/8 34 1/16 30 7/16 29 1/4 440.00
36 5 3/8 34 1/16 36 1/2 35 1/4 1180.00

Weldolet – Reducing and Flat, ANSI Sch STD, FCS

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Outlet Size (NPS) A B C Approx. Weight (lb)
1/8 5/8 1 5/8 0.10
1/4 5/8 1 5/8 0.10
3/8 3/4 1 1/4 3/4 0.15
1/2 3/4 1 3/8 15/16 0.20
3/4 7/8 1 3/4 1 3/16 0.25
1 1 1/16 2 1/8 1 7/16 0.50
1 1/4 1 1/4 2 9/16 1 3/4 0.80
1 1/2 1 5/16 2 7/8 2 1.00
2 1 1/2 3 1/2 2 9/16 1.75
2 1/2 1 5/8 4 1/16 3 2.50
3 1 3/4 4 13/16 3 11/16 4.00
3 1/2 1 7/8 5 5/8 4 5.50
4 2 6 4 3/4 6.30
5 2 1/4 7 1/16 5 9/16 10.25
6 2 3/8 8 1/2 6 11/16 12.00
8 2 3/4 10 3/8 8 11/16 23.00
10 3 1/16 12 11/16 10 13/16 36.00
12 3 3/8 14 7/8 12 13/16 59.00
14 3 1/2 16 1/8 14 1/16 66.00
16 3 11/16 18 1/4 16 1/16 75.00
18 3 13/16 20 1/2 18 1/16 97.00
20 4 22 1/2 20 118.00
24 4 9/16 27 1/8 24 3/16 220.00
26 4 11/16 29 1/16 26 1/4 265.00
30 5 3/8 34 1/16 30 7/16 430.00
36 5 3/8 34 1/16 36 1/2 900.00

Weldolet – Size to Size and Flat, ANSI Sch XS, FCS

20190208032455 54875 - What is a weldolet?

Outlet Size (NPS) A B C D Approx. Weight (lb)
1/2 3/4 1 3/8 15/16 5/8 0.15
3/4 7/8 1 5/8 1 3/16 13/16 0.25
1 1 1/16 2 1 7/16 1 1/32 0.40
1 1/4 1 1/4 2 7/16 1 3/4 1 3/8 0.70
1 1/2 1 5/16 2 7/8 2 1 5/8 0.90
2 1 1/2 3 1/2 2 9/16 2 1/16 1.60
2 1/2 1 5/8 4 1/16 3 2 7/16 2.50
3 1 3/4 4 13/16 3 11/16 3 1/16 4.10
3 1/2 2 5 3/8 3 7/8 3 9/16 5.10
4 2 6 4 3/4 4 7.50
5 2 1/4 7 1/8 5 9/16 5 1/16 9.50
6 3 1/16 8 7/8 6 11/16 6 1/16 15.00
8 3 7/8 10 5/8 8 11/16 7 5/8 32.00
10 3 1/2 12 7/8 10 7/16 9 3/4 46.00
12 3 15/16 15 3/16 13 11 3/4 61.00
14 4 1/8 16 11/16 14 5/16 13 75.00
16 4 7/16 18 7/8 16 1/2 15 115.00
18 4 11/16 21 1/8 18 5/8 17 130.00
20 5 23 3/8 20 13/16 19 187.00
24 5 1/2 27 7/8 25 1/8 23 316.00
26 5 3/4 30 1/8 27 1/4 25 370.00

Weldolet – Reducing and Flat, ANSI Sch XS, FCS

20190208032757 85150 - What is a weldolet?

Outlet Size (NPS) A B C Approx. Weight (lb)
1/8 5/8 1 5/8 0.10
1/4 5/8 1 5/8 0.10
3/8 3/4 1 1/4 3/4 0.15
1/2 3/4 1 3/8 15/16 0.20
3/4 7/8 1 3/4 1 3/16 0.30
1 1 1/16 2 1/8 1 7/16 0.50
1 1/4 1 1/4 2 9/16 1 3/4 0.90
1 1/2 1 5/16 2 7/8 2 1.10
2 1 1/2 3 1/2 2 9/16 1.75
2 1/2 1 5/8 4 1/16 3 2.60
3 1 3/4 4 13/16 3 11/16 4.10
3 1/2 1 7/8 5 3/8 4 5.60
4 2 6 4 3/4 6.40
5 2 1/4 7 1/16 5 9/16 10.40
6 3 1/16 8 7/8 6 11/16 23.00
8 3 7/8 11 1/2 8 11/16 37.00
10 3 11/16 12 3/4 10 7/16 46.00
12 4 1/16 14 15/16 12 1/2 61.00
14 3 15/16 17 13 13/16 70.00
16 4 3/16 18 3/8 15 7/8 102.00
18 4 3/8 20 3/8 17 15/16 130.00
20 4 11/16 22 15/16 20 1/16 158.00
24 5 1/2 27 7/8 24 3/16 290.00
26 5 3/4 30 1/8 27 1/4 350.00

Weldolet – Size to Size and Flat, ANSI Sch 160/XXS, FCS

20190208033118 14337 - What is a weldolet?

Outlet Size (NPS) A B C Approx. Weight (lb)
1/2 1 1/8 1 3/8 9/16 0.25
3/4 1 1/4 1 3/4 3/4 0.70
1 1 1/2 2 1 0.80
1 1/4 1 3/4 2 7/16 1 5/16 1.25
1 1/2 2 2 3/4 1 1/2 1.75
2 2 3/16 3 3/16 1 11/16 2.15
2 1/2 2 7/16 3 13/16 2 1/8 3.40
3 2 7/8 4 3/4 2 7/8 6.35
4 3 5/16 6 3 7/8 10.50
5 3 11/16 7 3/8 4 13/16 14.25
6 4 1/8 8 11/16 5 3/4 30.25
For dimensions below see Heavy Wall Weldolet
8        
10        
12        
14        
16        
18        
24        

Weldolet – Reducing and Flat, ANSI Sch 160/XXS, FCS

20190208032757 85150 - What is a weldolet?

Outlet Size (NPS) A B C Approx. Weight (lb)
1/2 1 1/8 1 3/8 9/16 0.25
3/4 1 1/4 1 3/4 3/4 0.70
1 1 1/2 2 1 0.85
1 1/4 1 3/4 2 7/16 1 5/16 1.25
1 1/2 2 2 3/4 1 1/2 1.75
2 2 3/16 3 3/16 1 11/16 2.15
2 1/2 2 7/16 3 13/16 2 1/8 3.40
3 2 7/8 4 3/4 2 7/8 6.30
4 3 5/16 6 3 7/8 10.50
5 3 11/16 7 3/8 4 13/16 14.25
6 4 1/8 8 11/16 5 3/4 28.00
For dimensions below see Heavy Wall Weldolet
8 HW HW HW HW
10 HW HW HW HW
12 HW HW HW HW
14 HW HW HW HW
16 HW HW HW HW
18 HW HW HW HW
24 HW HW HW HW

What is the difference between half coupling, welded branch pipe, and weldolet?

The half coupling is connected to the branch pipe and is mainly used for pressure gauge joints.
The welded branch pipe is a joint larger than DN40. The weldolet is a joint that is less than or equal to DN40.
The half coupling, welded branch pipe, and weldoletlet are three forms of pipe branch and main pipe connection. The order of strength and economy is selected by welded branch pipe, half coupling, and weldolet.

  1. The welded branch pipe is used to open the hole in the main pipe. The branch pipe is directly welded to the main pipe. There is no pipe fitting in the middle. It is generally used in public works pipes with low temperature and pressure.
  2. Half coupling is used for DN ≤ 40, PN ≤ 6.3 MPa (or 300 LB).
  3. Weldolet is used for PN ≥ 10.0MPa (or 600LB), PN ≥ 16.0MPa (or 1500LB), the branch pipe uses three-way (or reducer tee) + reducer.

The form of the half coupling, the branch pipe and the branch pipe end are in the form of socket welding, threading and butt welding. Refer to GB19326, MSS SP-97, HG21632.
The weldolet is connected with the branch pipe, and is divided into three types: butt welding, socket welding, screw connection, etc.; according to the connection with the main pipe, the standard, the mitre, the elbow branch pipe.

The difference between the branch pipe and the half coupling is as follows:

  1. The half coupling with the main pipe is blunt, and the branch pipe is curved and attached to the main pipe;
  2. The socket welding and threaded pipe support table is generally the same as the half coupling, the maximum diameter is DN40, and the diameter of the butt welding pipe table can be DN600;
  3. Weldolet is more reliable than half coupling, which reduces the risk of stress concentration and the weld quality is easy to guarantee;
  4. Half coupling is generally indicated by the size of the branch pipe, and the branch pipe table must indicate the size of the main pipe and the main pipe for easy machining.

How to order a weldolet?

Specify Size

  • Outlet size
  • Run or Header

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)

Source: China Weldolet 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.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

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

References:

  • https://www.yaang.com
  • http://www.piping-designer.com/index.php/disciplines/mechanical/stationary-equipment/pipe-fittings/1608-branch-connection-fitting

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