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Definition and dimension charts of Weldolet fitting

Definition of  Weldolet?

Weldolet fitting is one of the most common types of piping components and this is a type of Olets. This is used for take branch connection from run pipe lines to branch pipe line and connected by butt weld welding process with 90° branch connection. In weldolet both ends will be beveled, mostly used for big bore to small bore connection with high pressure services pipe connection (more than 2 inches).

Weldolet fittings is used with butt weld connection fittings the same at outlet pipe also to minimize stress and to provide reinforcement for connection.Weldolet fittings schedule always use the same or higher schedule than branch run pipes for higher strength. This is available with full size or reducing size as well (Full size means the same size as run or header pipe size for example 4 inch to 4 inch branch connection, and reducing size means branch size is less than run or header pipe size likes 4 inch to any size less than 4 inch).  Some common standard and code are used to select the Weldolet that is ASTM A234, MSS SP-75, ASTM A403. In some places, standard TEE is also used instead of Olets, but Olets is cheaper, light weight and easy to weld. 

This is used where the branch pipe has less bore size than the header or run pipe. One other method is also used for branching the pipe connection with RF pad welding but this will be heaver and more economically. Olet are designed as per dimension Piping Code ASME B31.3. This is a type of Olets. Olet fittings (mostly called Branch Connection Fittings or Outlet Fittings) There are 12 types of Olet available in market these are as follows. Generally Sockolet is known and used as a socket fitting, and fabricated or available in Class 3000#, 6000# and 9000#.

Weldolets welding image
Weldolets welding image

Types of Olets

  • Weldolet 
  • Sockolet
  • Insert Weldolet
  • Elbolet 
  • Threadolet
  • Flexolet
  • Sweepolet 
  • Brazolet
  •  Coupolet 
  • Latrolet
  • Sweepolet
  • Nipolet

Schedule STD Weldolet Dimensionsweldolets dimension image

Schedule STD Weldolet Dimensions
N 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
40 1000 225.4 1187.6 1016 435
42 1050 235 1244.6 1066.8 540
48 1200 241.3 1404 1219.2 750
  • Dimensions.. Top Row in Inches / Bottom Row in millimeters.
  • Root Gap – X – “Space” For welding, the O’let is raised off the run pipe to establish a 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.
  • L = Dimensions Center Line of Run Pipe + X (Root Gap) + A (height of Weldolet).

Schedule XS Weldolet Dimensions

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
Note section copy as above mentioned

Schedule XXS Weldolet Dimensions

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

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

Selection of Weldolets

During the section of Weldolet, some of the technical details are required these are as follows.

Title name with complete details specifications- cs sock olet 800x40mm cl3000 SW, nominal bore size(mm) required for both pipe like- Header or run pipe to branch pipe ( 8″X2″). Pressure class rating/ pipe schedule- Class 150, 300, 900 or more for Schedule- Sch10, 20, 40, 80 and other, What are types of olets as required – Weldolet, Sockolet or Thredolets and other depends on your requirements,Type of end connection required – bevel end, flat end or other type, material of construction   required as per your requirement like carbon steel(cs) , MS, SS or other, which dimension standard should be followed like as MSS-SP-97, which design standard need to follow as your requirement like as ASMT A105, for steam services required (IBR or NON-IBR).

Following materials code are available that is Carbon Steel (ASTM A105 for high-temperature, A350 LF2/LF3 for low-temperature), Alloy Steel (ASTM A182 Grades F5, F9, F11, F22), stainless steel (ASTM A182 F304, F316, and other SS grades), Nickel alloys (Inconel, Monel, Incoloy, etc), For dimension standard bevel ends ASME B16.9 and B16.25, Source comes from Bonney Forge (except the sizes in millimeters) and that is Weldolet® is a registered name.

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