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#.

Types of Olets

Weldolet  Sockolet Insert Weldolet

Elbolet  Threadolet Flexolet

Sweepolet  Brazolet  Coupolet

Latrolet Sweepolet Nipolet

Schedule STD Weldolet Dimensions

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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