What is Weldolet?

Weldolet is a type of self-reinforced branch fitting developed by a Company called Bonney Forge. It is used when branch connections are required in size where reducing tees are not available and/or when the branch connections are smaller than header size or when tee cannot be accommodated in the piping header, weldolets are used.

It comes in full size or reducing size. Full size is when you take a branch of the same size as run pipe size, for example, 3 inches to 3 inches. And reducing size is when branch size is less than run pipe size. For example, 3 inches to 1 inch. Weldolet’s end is suited for the butt welding connection.

Weldolets are available in Standard Weight, Extra Strong, and Double Extra Strong (Schedule 160).

Weldolet® is a Registered Trademark of Bonney Forge.

Weldolets

Weldolet Dimensions

During the Dimensional inspection of weldolets, you should check for

  • Outer & Inner Diameter of body
  • Length of the Hub
  • End preparation (Bevel angle)

Olets are designed for specific conditions based on Process piping Code ASME B31.3; hence, Dimension is also specified by the designer. However, MSS-SP-97 provides dimension requirements for standard 90° self-reinforced branch connection with butt, socket, and threaded end types.

weldolet dimensions inspection

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Weldolet Dimensions Chart

weldolet dimesion

Schedule STD Weldolet Dimensions

Size Size in mm Height A OD -B Hole Dia C Weight in KG
1/4 8 14.3 25.4 15.9 0.04
3/8 10 19.05 31.75 19.05 0.07
1/2 15 19.05 34.93 23.81 0.08
3/4 20 22.23 44.45 30.16 0.11
1 25 26.99 53.98 36.51 0.23
1 1/4 32 31.75 65.09 44.45 0.36
1 1/2 40 33.34 73.03 50.8 0.45
2 50 38.1 88.9 65.09 0.79
2 1/2 65 41.28 103.19 76.2 1.13
3 80 44.45 122.24 93.66 1.81
3 1/2 90 47.63 142.88 112.71 2.5
4 100 50.8 152.4 120.65 2.86
5 130 57.15 179.3 141.29 4.65
6 150 60.33 215.9 169.86 6.44
8 200 69.85 263.53 220.66 10.66
10 250 77.79 322.26 274.64 17.69
12 300 85.73 377.83 325.44 26.76
14 350 88.9 409.58 357.19 29.94
16 400 93.6 463.55 407.99 34.02
18 450 96.84 520.7 458.79 44
20 500 101.6 571.5 508 53.52
24 600 144.5 717.5 609.6 101
26 650 155.6 778 660.4 120
30 750 174.6 893.6 762 190
36 900 206.4 1070 914.4 310
40 1000 225.4 1187.6 1016 435
42 1050 235 1244.6 1066.8 540
48 1200 241.3 1404 1219.2 750

Schedule XS Weldolet Dimensions

Size Size in mm Height – A OD – B Hole Dia – C Weight in KG
1/4 8 N/A 25.4 15.88 0.05
3/8 10 N/A 31.75 19.05 0.07
1/2 15 19.05 34.93 23.81 0.09
3/4 20 22.23 44.45 30.16 0.14
1 25 26.99 53.98 36.51 0.21
1 1/4 32 31.75 65.09 44.45 0.41
1 1/2 40 33.34 73.03 50.8 0.5
2 50 38.1 88.9 65.09 0.79
2 1/2 65 41.28 103.19 76.2 1.18
3 80 44.45 122.24 93.66 1.86
3 1/2 90 47.63 136.53 112.71 2.54
4 100 50.8 152.4 120.65 2.9
6 150 77.79 225.43 169.86 10.43
8 200 98.43 292.1 220.66 16.78
10 250 93.66 323.85 265.11 20.87
12 300 103.1 379.41 317.5 27.67
14 350 100.01 431.8 350.84 31.75
16 400 106.36 466.73 403.23 46.27
18 450 111.13 523.88 455.61 58.97
20 500 119.06 582.61 509.59 71.67
24 600 152.4 722.2 609.6 142
26 650 165.1 782.6 660.4 168
30 750 181 896.8 762 218
36 900 212.7 1074.4 914.4 404
40 1000 235 1194 1016 582
42 1050 244.5 1250.8 1066.8 590
48 1200 273 1425.6 1219.2 910

Schedule XXS Weldolet Dimensions

Size Size in mm Height – A OD – B Hole Dia – C Weight in KG
1/2 15 28.58 34.93 14.29 0.11
3/4 20 31.75 44.45 19.05 0.32
1 25 38.1 50.8 25.4 0.38
1 1/4 32 44.45 61.91 33.34 0.57
1 1/2 40 50.8 69.85 38.1 0.79
2 50 55.56 80.96 42.86 0.97
2 1/2 65 61.91 96.84 53.98 1.53
3 80 73.03 120.65 73.03 2.87
4 100 84.14 152.4 98.43 4.76
5 130 93.66 187.33 122.24 6.46
6 150 104.78 220.66 146.05 12.7
8 200 111.12 284.16 173.04 20.41
10 250 125.41 312.74 215.9 38.56

Schedule 160 Weldolet Dimensions

Size Size in mm Height – A OD – B Hole Dia – C Weight in KG
1/2 15 28.58 34.93 14.29 0.11
3/4 20 31.75 44.45 19.05 0.32
1 25 38.1 50.8 25.4 0.38
1 1/4 32 44.45 61.91 33.34 0.57
1 1/2 40 50.8 69.85 38.1 0.79
2 50 55.56 80.96 42.86 0.97
2 1/2 65 61.91 96.84 53.98 1.53
3 80 73.03 120.65 73.03 2.87
4 100 84.14 152.4 98.43 4.76
5 130 93.66 187.33 122.24 6.46
6 150 104.78 220.66 146.05 12.7
8 200 111.12 284.16 173.04 20.41
10 250 125.41 312.74 215.9 38.56

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About Author

Varun Patel, B.E – Mechanical, PMP®

19+ years of experience in the oil and gas sector, specializing in project management, contracts, project control, project coordination, QA/QC and inspection of large-scale Greenfield and Brownfield Projects such as Refinery, Petrochemical, Wellhead production, and Process platform. Proven track record of delivering large-scale projects while ensuring adherence to safety and quality standards. Skilled in leading and mentoring cross-functional teams and resolving technical issues to achieve successful project outcomes.