MSS SP-97 Weldolet


MSS SP-97 Weldolet is a standard developed by the Manufacturers Standardization Society (MSS) that covers integrally reinforced forged branch outlet fittings, which are commonly known as "olets." The most common type of olet is the Weldolet. Weldolets are used to provide a branch connection in a piping system, typically connecting a smaller diameter branch pipe to a larger diameter main pipe. When using MSS SP-97 Weldolets, it is crucial to follow the standard's requirements to ensure the safety and reliability of the piping system. Engineers and designers should consult the latest version of the standard for the most up-to-date information and specifications.

mss-sp-97-weldolet
MSS SP-97 Weldolet

MSS SP-97 Fittings Specifications

Specification Chart: MSS SP-97 Weldolet
Manufacturer Types Weldolet
Sockolet
Threadolet
Elbolet
Nipolet
Latrolet
Sweepolet
Insert Weldolet
Brazolet
Coupolet
Weldolet Uses MSS SP 97 Weldolet refers to its branch welded onto outlet pipe.
Packing plywood cases, pallets, or as per your request.
Surface treatment anti-oil; anti-painting
Standard GB / ANSI /JIS / DIN
Method Types Threaded (NPT)
Socket Weld
BSPT
BSP
Type Of Standards MSS SP-97
Manufacturer Size SW Fitting = ½” Inch To 8” Inch
Threaded (NPT) Fitting = ½” Inch To 8” Inch
Pressure Class SW Fitting = Class 3000/ Class 6000/ Class 9000
NPT Fitting = Class 2000/ Class 3000/ Class 6000
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Production Technique Forged/ Heat treated and machined
Application Power/ gas/ petroleum/ chemical/ metallurgy/ shipbuilding etc.

Types Of Branch Connection Fittings

mss-sp-97-fittings
MSS SP-97 Fittings
mss-sp-97-sockolet
MSS SP-97 Sockolet
mss-sp-97-weldolet
MSS SP-97 Weldolet
mss-sp-97-thredolet
MSS SP-97 Thredolet
mss-sp-97-latrolet
MSS Sp-97 Latrolet
mss-sp-97-elbolet
MSS Sp 97 Elbolet
mss-sp-97-nipolet
MSS SP-97 Nipolet
mss-sp-97-sweepolet
MSS Sp 97 Sweepolet
mss-sp-97-brazolet
MSS sp 97 Brazolet
mss-sp-97-coupolet
MSS Sp-97 Coupolet
pipe-outlet-fittings
Pipe Outlet Fittings
branch-fittings
Branch fittings
outlet-pipe-fittings
Outlet Pipe Fittings
mss-sp-97-insert-weldolet
MSS sp-97 Insert Weldolet
mss-sp-97-flexolet-butt-weld
MSS Sp-97 Flexolet Butt Weld
mss-sp-97-flexolet-threaded
MSS Sp-97 Flexolet Threaded

MSS Sp-97 Weldolet Dimensions

mss-sp-97-weldolet-dimensions
Normal Pipe Size (A) (B) (C) (D)
1/2 3/4
19.05
1.3/8
34.93
15/16
23.81
5/8
15.88
3/4 7/8
22.23
1.5/8
41.28
1.3/16
30.16
13/16
20.64
1 1.1/16
26.99
2
50.80
1.7/16
36.51
1.1/32
26.19
1.1/4 1.1/4
31.75
2.3/8
60.3
1.3/4
44.45
1.3/8
34.93
1.1/2 1.5/16
33.34
2.7/8
73
2
50.80
1.5/8
41.28
2 1.1/2
38.10
3.1/2
88.90
2.9/16
65.09
2.1/16
52.39
2.1/2 1.5/8
41.28
4.1/16
103.19
3
76.20
2.7/16
61.91
3 1.3/4
44.45
4.13/16
122.24
3.11/16
93.66
3.1/16
77.79
3.1/2 2
50.80
5.3/8
136.53
3.7/8
98.43
3.9/16
90.49
4 2
50.80
6
152.40
4.3/4
120.65
4
101.60
5 2.1/4
57.15
7.1/8
180.98
5.9/16
141.29
5.1/16
128.59
6 2.3/8
60.3
8.1/2
215.90
6.11/16
169.86
6.1/16
153.99
8 2.3/4
69.85
10.3/8
263.53
8.11/16
220.66
7.15/16
201.61
10 3.1/16
77.79
12.9/16
319.09
10.13/16
274.64
10
254.00
12 3.3/8
85.73
14.7/8
377.83
12.13/16
325.44
12
304.80
14 3.1/2
88.90
16.1/8
409.58
14.1/16
357.19
13.1/4
336.55
16 3.11/16
93.66
18¼
463.55
16.1/16
407.99
15¼
387.35
18 4.1/16
103.19
20.3/4
527.05
18.5/8
473.08
17¼
438.15
20 4.5/8
117.48
23.1/16
585.79
20.1/16
509.59
19¼
488.95
24 5.3/8
136.53
27.7/8
708.03
25.1/8
638.18
23.1/4
590.55

MSS Sp-97 Sockolet Dimensions

mss-sp-97-sockolet-dimensions
NPS (A) (B) (C) (D) (E)
1/2″ 25.4 35.71 23.01 15.8 14.28
3/4″ 26.98 43.65 29.36 20.93 14.28
1″ 33.33 50.8 36.51 26.64 19.84
1 1/4″ 33.33 65.08 44.45 35.05 19.05
1 1/2″ 34.92 72.23 50.8 40.89 19.05
2″ 38.1 88.1 65.08 52.5 20.63
2 1/2″ 39.68 103.18 76.2 62.71 19.05
3″ 44.45 122.23 93.66 77.93 23.81
3 1/2″ 42.86 136.52 112.71 90.12 17.46
4″ 47.62 151.6 120.65 102.26 26.98
5″ 66.67 185.73 141.28 128.19 34.13
6″ 69.85 219.07 169.86 154.05 35.71
1/2″ 31.75 43.65 19.05 11.84 22.22
3/4″ 36.51 49.6 25.4 15.6 22.22
1″ 39.68 61.91 33.33 20.7 23.81
1 1/4″ 41.27 69.05 38.1 29.46 20.63
1 1/2″ 42.86 82.55 49.21 33.99 22.22
2″ 52.38 102.39 69.85 42.9 30.16

MSS Sp-97 Threadolet Dimensions

mss-sp-97-threadolet-dimensions

MSS Sp-97 Elbolet Dimensions

mss-sp-97-elbolet-dimensions
Nominal Sizes Of
Elbow
(Inch)
Size Of Elbolet In
Inches
Elbolet Dimensions
Threaded Class 3000 &
Socket Weld Std. & XS Buttweld
Threaded Class 6000 &
Socketweld Sch. 160 & 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
**2 1/2 4 3/16 3 1/4
**3 5 1/16 3 7/8
Order to Specific **4 6 5/8 4 13/16
Elbow Sizes **6 9 3/8 6 1/2 ** **
**8 13 5/16 8 1/16
**10 17 1/32 10 3/8
**12 19 5/8 11 1/8

MSS Sp-97 Nipolet Dimensions

mss-sp-97-nipolet-dimensions

MSS Sp-97 Latrolet Dimensions

mss-sp-97-latrolet-dimensions
Normal Pipe Size Face to Crotch (L)
Class 3000 Latrolet Class 6000 Latrolet
1/8" 19
1/4" 19
3/8" 21
1/2" 25 32
3/4" 27 37
1" 33 40
1 1/4" 33 41
1 1/2" 35 43
2" 38 52
2 1/2" 46
3" 51
4" 57

MSS Sp-97 Sweepolet Dimensions

mss-sp-97-sweepolet-dimensions
Size Of Normal Run Size Of Outlet In
Inch
Sweepolet Dimensions
(A) (B)
6 to 36 1 1/4 1 1/4 4
6 to 36 1 1/2 1 3/4 5 1/2
6 to 36 2 1 1/2 5 1/2
6 to 36 3 1 21/32 7
6 to 36 4 2 1/32 8 3/4
10 to 36 6 2 11/16 13
12 to 36 8 3 15
16 to 36 10 3 1/8 18 1/2
16 to 36 12 3 5/16 20 1/2
20 to 36 14 3 5/8 24
24 to 36 16 3 3/4 28
24 to 36 18 4 5/8 31
24 to 36 20 5 1/8 33
30 to 36 24 5 5/8 38

MSS Sp-97 Insert Weldolet Dimensions

Normal Outlet
Size In Inch
(Height above run pipe) A' Dimensions
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" Thickness 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" Thickness 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" Thickness 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" Thickness 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

MSS Sp-97 Brazolet Dimensions

mss-sp-97-brazolet-dimensions
Normal Sizes Of Outlet (A) (B) (C) Brazing Surface F-MIN. MIL-1183
1/4 11/16 1 9/16 0.188 0.700
3/8 13/16 1 1/4 3/4 0.190 0.855
1/2 1 1 7/16 7/8 0.220 1.020
3/4 1 1/16 1 3/4 1 1/8 0.240 1.250
1 1 1/4 2 1/8 1 7/16 0.270 1.535
1 1/4 1 5/16 2 9/16 1 3/4 0.300 1.900
1 1/2 1 3/8 2 7/8 2 0.330 2.160
2 1 1/2 3 1/2 2 9/16 0.360 2.675
2 1/2 1 13/16 4 1/8 3 0.384 3.215
3 2 4 13/16 3 11/16 0.442 3.880
4 2 1/4 6 4 3/4 0.476 4.940
5 2 5/8 7 1/16 5 9/16 0.656 6.163

MSS Sp-97 Coupolet Dimensions

mss-sp-97-coupolet-dimensions
Threaded Coupolet Class 300
Nominal Size Of
Outlet (NOS)
Coupolet Dimensions
(A) (C) (F)
1/2 15/16 0.745 1.188
3/4 1 0.958 1.441
1 1 3/16 1.188 1.562
1 1/4 1 5/16 1.550 1.906
1 1/2 1 9/16 1.780 2.188
2 1 11/16 2.260 2.750
2 1/2 1 13/16 2.890 3.386
3 2 1/2 3.400 4.000
4 3 4.380 5.000

Weldolet Mss Sp-97 Weight

Size Of Weldolet In inches (A) (B) (C) (D) Weight in LBS
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 0.4
1 1/4 1 1/4 2 3/8 1 3/4 1 3/8 0.7
1 1/2 1 5/16 2 7/8 2 1 5/8 0.8
2 1 1/2 3 1/2 2 9/16 2 1/16 1.5
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
4 2 6 4 3/4 4 6.7
5 2 1/4 7 1/8 5 9/16 5 1/16 8.5
6 2 3/8 8 1/2 6 11/16 6 1/16 14
8 2 3/4 10 3/8 8 11/16 7 15/16 28
10 3 1/16 12 9/16 10 13/16 10 39
12 3 3/8 14 7/8 12 13/16 12 65
14 3 1/2 16 1/8 14 1/16 13 1/4 70
16 3 11/16 18 1/4 16 1/16 15 1/4 92
18 4 1/16 20 3/4 18 5/8 17 1/4 125
20 4 5/8 23 1/16 20 1/16 19 1/4 175
24 5 3/8 27 7/8 25 1/8 23 1/4 280
30 5 3/8 34 1/16 30 7/16 29 1/4 440
36 5 3/8 34 1/16 36 1/2 35 1/4 1180

Schedule STD Weldolet Dimensions

Size Size in millimeter Height Of (A) Outer Diameter Of (B) Hole Diameter C Weight in Kilogram
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 millimeter Height Of (A) Outer Diameter Of (B) Hole Diameter Of (C) Weight in Kilogram
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 millimeter Height Of (A) Outer Diameter Of (B) Hole Diameter Of (C) Weight in Kilogram
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 millimeter Height Of (A) Outer Diameter Of (B) Hole Diameter Of C Weight in Kilogram
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

MSS SP-97 Thredolet Pressure Rating

Pressure Normal Pipe Size (A) (B) (C) (D)
STD 1/2″ 19.05 34.93 23.81 15.88
STD 3/4″ 22.23 41.28 30.16 20.64
STD 1″ 26.99 50.8 36.51 26.19
STD 1 1/4″ 31.75 60.3 44.45 34.93
STD 1 1/2″ 33.34 73 50.8 41.28
STD 2″ 38.1 88.9 65.09 52.39
STD 2 1/2″ 41.28 103.19 76.2 61.91
STD 3″ 44.45 122.24 93.66 77.79
STD 3 1/2″ 50.8 136.53 98.43 90.49
STD 4″ 50.8 152.4 120.65 101.6
STD 5″ 57.15 180.98 141.29 128.59
STD 6″ 60.3 215.9 169.86 153.99
STD 8″ 69.85 263.53 220.66 201.61
STD 10″ 77.79 319.09 274.64 254
STD 12″ 85.73 377.83 325.44 304.8
STD 14″ 88.9 409.58 357.19 336.55
STD 16″ 93.66 463.55 407.99 387.35
STD 18″ 103.19 527.05 473.08 438.15
STD 20″ 117.48 585.79 509.59 488.95
STD 24″ 136.53 708.03 638.18 590.55
XS 1/2″ 19.05 34.93 23.81 15.88
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