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carbon-steel-slip-on-flanges
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Slip on flange, also called SO flange. It’s a kind of flange slides over the pipe with internal design is slightly larger than the pipe. Since the inner diameter of the flange is slightly larger than the outer diameter of the pipe, the SO flange can be directly connected to equipment or pipe by fillet weld at the top and bottom of the flange. It is used to insert the pipe into the inner hole of the flange.

Our Supply Range:

Standard: ASTM A105, ASTM A182
Material: Carbon Steel, Alloy Steel, Stainless Steel
Size: 1/2” to 24”, customized up to 60”
Pressure Ratings: Class 150 to Class 2500
Face Type: RF, RTJ

Types of Slip On Flange Welding:

The SO flange can be divided into SO welding plate flange and SO welding hubbed steel pipe flange. Its mechanical characteristics are between the integral flange and the looping flange. The structure is simple, and the processing is convenient. So slip on flange welding is widely used in various fluid pipelines.

Depends on different face, there are also ranges raised face type and ring type joint face type.

Raised Face Slip On Flange:

There is a small portion extruded from the bottom face of the slip on flange, this type is raised face slip on flange. The function of this area is to place a gasket seat during installation to get a better sealing performance. 

As the pressure ratings bigger, the height of this raised face will be bigger.

RTJ Slip on Flange:

A small grooved is machined on the raised face part, this form is called RTJ type, the function of this groove is to place the gasket ring, also applied for sealing, compared to RF type, RTJ is designed for high pressure use.Slip on flange use slip welding to connect equipment, so either below of name is describing the same flange:

  • Slip on weld flange
  • Slip on flange weld
  • Weld slip on flange
  • Slip on flange welding
  • SO flange

Referred Standard and Grades:

ASTM A105 for carbon steel slip on pipe flanges.
ASTM A182 for alloy and stainless slip on flanges. (Alloy for F11, F22, stainless for F304/F304L, F316/F316L)
ASME B16.5 for pipe flanges and flanged fittings.
BS 3293
DIN 86029

Dimensions and Pressure Ratings:

Common outer diameters: 1/2”, 2”,  3”, 4”, 6”, 8”, 10”, 12”, to 24”.
Special made outer diameters: Up to 60”.
Class range: Class 150, Class 300, 400, 600, 900, 1500, 2500(# or LB). PN 2.5 to PN 250.
Flange face type: RF (Raised Face), RTJ (Ring Type Joint)

Manufacturing Types:

Slip on flange can be made by forging, steel cutting, casting and etc. Among these manufacturing types, the forging type gains the best quality and also the most common use, price is higher than other types. So before purchase the slip on flange, you have to know what is the specific working environment.

Advantages of Slip On Flange:

  • Lower installation costs
  • More easy to align with other parts during installation
  • Better leaking proof
  • ​Inner and outer welding on flange
  • Takes less time to cut accurately for the pipelines
  • As pipe slides on the flange, it compatible with lower hub on slip on flange

 

Nominal Outside Thick of Diameter of Diameter of Length Dia of No of Dia of Dia of Diam of Approx
Pipe Size diameter of flange Hub at base raised face thru Hub bore holes holes bolts bolt circle weight
  flange (B) (A) (G) (H) (ID)   (L)   (K) kg
  (D)                    
1/2. 88.9 11.2 35.1 30.2 15.7 22.4 4 15.7 1/2. 60.5 0.5
3/4. 98.6 12.7 42.9 38.1 15.7 27.7 4 15.7 1/2. 69.9 1
1 108 14.2 50.8 49.3 17.5 34.5 4 15.7 1/2. 79.2 1
1-1/4. 117.3 15.7 63.5 58.7 20.6 43.2 4 15.7 1/2. 88.9 1
1-1/2. 127 17.5 73.2 65 22.4 49.5 4 15.7 1/2. 98.6 1
2 152.4 19.1 91.9 77.7 25.4 62 4 19.1 5/8. 120.7 2
2-1/2. 177.8 22.4 104.6 90.4 28.4 74.7 4 19.1 5/8. 139.7 3
3 190.5 23.9 127 108 30.2 90.7 4 19.1 5/8. 152.4 4
3-1/2. 215.9 23.9 139.7 122.2 31.8 103.4 8 19.1 5/8. 177.8 5
4 228.6 23.9 157.2 134.9 33.3 116.1 8 19.1 5/8. 190.5 6
5 254 23.9 185.7 163.6 36.6 143.8 8 22.4 3/4. 215.9 7
6 279.4 25.4 215.9 192 39.6 170.7 8 22.4 3/4. 241.3 9
8 342.9 28.4 269.7 246.1 44.5 221.5 8 22.4 3/4. 298.5 14
10 406.4 30.2 323.9 304.8 49.3 276.4 12 25.4 7/8. 362 20
12 482.6 31.8 381 365.3 55.6 327.2 12 25.4 7/8. 431.8 29
14 533.4 35.1 412.8 400.1 57.2 359.2 12 28.4 1 476.3 41
16 596.9 36.6 469.9 457.2 63.5 410.5 16 28.4 1 539.8 44
18 635 39.6 533.4 505 68.3 461.8 16 31.8 1-1/8. 577.9 59
20 698.5 42.9 584.2 558.8 73.2 513.1 20 31.8 1-1/8. 635 75
24 812.8 47.8 692.2 663.4 82.6 616 20 35.1 1-1/4. 749.3 100

 

Dimensions of Class 300 Slip-On Flanges

 

Nominal Outside Thick of Diameter of Diameter of Length Dia of No of Dia of Dia of Diam of Approx
Pipe Size diameter of flange Hub at base raised face thru Hub bore holes holes bolts bolt circle weight
  flange (B) (A) (G) (H) (ID)   (L)   (K) kg
  (D)                    
1/2. 95.3 14.2 35.1 38.1 22.4 22.4 4 15.7 1/2. 66.5 1
3/4. 117.3 15.7 42.9 47.8 25.4 27.7 4 19.1 5/8. 82.6 1
1 124 17.5 50.8 53.8 26.9 34.5 4 19.1 5/8. 88.9 1
1-1/4. 133.4 19.1 63.5 63.5 26.9 43.2 4 19.1 5/8. 98.6 2
1-1/2. 155.4 20.6 73.2 69.9 30.2 49.5 4 22.4 3/4. 114.3 3
2 165.1 22.4 91.9 84.1 33.3 62 8 19.1 5/8. 127 3
2-1/2. 190.5 25.4 104.6 100.1 38.1 74.7 8 22.4 3/4. 149.4 5
3 209.6 28.4 127 117.3 42.9 90.7 22.4 8 3/4. 168.1 6
3-1/2. 228.6 30.2 139.7 133.4 44.5 103.4 22.4 8 3/4. 184.2 8
4 254 31.8 157.2 146.1 47.8 116.1 8 22.4 3/4. 200.2 10
5 279.4 35.1 185.7 177.8 50.8 143.8 8 22.4 3/4. 235 13
6 317.5 36.6 215.9 206.2 52.3 170.7 12 22.4 3/4. 269.7 18
8 381 41.1 269.7 260.4 62 221.5 12 25.4 73/93 330.2 26
10 444.5 47.8 323.9 320.5 66.5 276.4 16 28.4 1 387.4 37
12 520.7 50.8 381 374.7 73.2 327.2 16 31.8 1-1/8. 450.9 52
14 584.2 53.8 412.8 425.5 76.2 359.2 20 31.8 1-1/8. 514.4 75
16 647.7 57.2 469.9 482.6 82.6 410.5 20 35.1 1-1/4. 571.5 86
18 711.2 60.5 533.4 533.4 88.9 461.8 24 35.1 1-1/4. 628.7 113
20 774.7 63.5 584.2 587.2 95.3 513.1 24 35.1 1-1/4. 685.8 143
24 914.4 69.9 692.2 701.5 106.4 616 24 41.1 1-1/2. 812.8 215

 

Dimensions of Class 600 Slip-On Flanges

 

Nominal Outside Thick of Diameter of Diameter of Length Dia of No of Dia of Dia of Diam of Approx
Pipe Size diameter of flange Hub at base raised face thru Hub bore holes holes bolts bolt circle weight
  flange (B) (A) (G) (H) (ID)   (L)   (K) kg
  (D)                    
1/2. 95.3 14.2 35.1 38.1 22.4 22.4 4 15.7 1/2. 66.5 1
3/4. 117.3 15.7 42.9 47.8 25.4 27.7 4 19.1 5/8. 82.6 1
1 124 17.5 50.8 53.8 26.9 34.5 4 19.1 5/8. 88.9 2
1-1/4. 133.4 20.6 63.5 63.5 28.4 43.2 4 19.1 5/8. 98.6 2
1-1/2. 155.4 22.4 73.2 69.9 31.8 49.5 4 22.4 3/4. 114.3 3
2 165.1 25.4 91.9 84.1 36.6 62 8 19.1 5/8. 127 4
2-1/2. 190.5 28.4 104.6 100.1 41.1 74.7 8 22.4 3/4. 149.4 6
3 209.6 31.8 127 117.3 46 90.7 8 22.4 3/4. 168.1 7
3-1/2. 228.6 35.1 139.7 133.4 49.3 103.4 8 25.4 7/8. 184.2 10
4 273.1 38.1 157.2 152.4 53.8 116.1 8 25.4 7/8. 215.9 17
5 330.2 44.5 185.7 189 60.5 143.8 8 28.4 1 266.7 29
8 419.1 55.6 269.7 273.1 76.2 221.5 12 31.8 1-1/8. 349.3 52
10 508 63.5 323.9 342.9 85.9 276.4 16 35.1 1-1/4. 431.8 77
12 558.8 66.5 381 400.1 91.9 327.2 20 35.1 1-1/4. 489 91
14 603.3 69.9 412.8 431.8 93.7 359.2 20 38.1 1-3/8. 527.1 104
16 685.8 76.2 469.9 495.3 106.4 410.5 20 41.1 1-1/2. 603.3 150
18 743 82.6 533.4 546.1 117.3 461.8 20 44.5 1-5/8. 654.1 181
20 812.8 88.9 584.2 609.6 127 513.1 24 44.5 1-5/8. 723.9 231
24 939.8 101.6 692.2 717.6 139.7 616 24 50.8 1-7/8. 838.2 331

 

Dimensions of Class 900 Slip-On Flanges

Nominal Outside Thick of Diameter of Diameter of Length Dia of No of Dia of Dia of Diam of Approx
Pipe Size diameter of flange Hub at base raised face thru Hub bore holes holes bolts bolt circle weight
  flange (B) (A) (G) (H) (ID)   (L)   (K) kg
  (D)                    
1/2. 120.7 22.4 35.1 38.1 31.8 22.4 4 22.4 3/4. 82.6 2
3/4. 130 25.4 42.9 44.5 35.1 27.7 4 22.4 3/4. 88.9 2
1 149.4 28.4 50.8 52.3 41.1 34.5 4 25.4 7/8. 101.6 4
1-1/4. 158.8 28.4 63.5 63.5 41.1 43.2 4 25.4 7/8. 111.3 4
1-1/2. 177.8 31.8 73.2 69.9 44.5 49.5 4 28.4 1 124 5
2 215.9 38.1 91.9 104.6 57.2 62 8 25.4 7/8. 165.1 11
2-1/2. 244.3 41.1 104.6 124 63.5 74.7 8 28.4 1 190.5 16
3 241.3 38.1 127 127 53.8 90.7 8 25.4 7/8. 190.5 12
4 292.1 44.5 157.2 158.8 69.9 116.1 8 31.8 1-1/8. 235 24
5 349.3 50.8 185.7 190.5 79.2 143.8 8 35.1 1-1/4. 279.4 38
6 381 55.6 215.9 235 85.9 170.7 31.8 12 1-1/8. 317.5 50
8 469.9 63.5 269.7 298.5 101.6 221.5 12 38.1 1-3/8. 393.7 77
10 546.1 69.9 323.9 368.3 108 276.4 16 38.1 1-3/8. 469.9 111
12 609.6 79.2 381 419.1 117.3 327.2 20 38.1 1-3/8. 533.4 147
14 641.4 85.9 412.8 450.9 130 359.2 20 41.1 1-1/2. 558.8 181
16 704.9 88.9 469.9 508 133.4 410.5 20 44.5 1-5/8. 41.3 616
18 787.4 101.6 533.4 565.2 152.4 461.8 20 50.8 1-7/8. 685.8 272
20 857.3 108 584.2 622.3 158.8 513.1 20 53.8 2 749.3 331
24 1041.4 139.7 692.2 749.3 203.2 616 20 66.5 2-1/2. 901.7 635

 

Dimensions of Class 1500 Slip-On Flanges

Nominal Outside Thick of Diameter of Diameter of Length Dia of No of Dia of Dia of Diam of Approx
Pipe Size diameter of flange Hub at base raised face thru Hub bore holes holes bolts bolt circle weight
  flange (B) (A) (G) (H) (ID)   (L)   (K) kg
  (D)                    
1/2. 120.7 22.4 35.1 38.1 31.8 22.4 4 22.4 3/4. 82.6 2
3/4. 130 25.4 42.9 44.5 35.1 27.7 4 22.4 3/4. 88.9 2
1 149.4 28.4 50.8 52.3 41.1 34.5 4 25.4 7/8. 101.6 4
1-1/4. 158.8 28.4 63.5 63.5 41.1 43.2 4 25.4 7/8. 111.3 4
1-1/2. 177.8 31.8 73.2 69.9 44.5 49.5 4 28.4 1 124 5
2 215.9 38.1 91.9 104.6 57.2 62 8 25.4 7/8. 165.1 11
2-1/2. 244.3 41.1 104.6 124 63.5 74.7 8 28.4 1 190.5 16
3 266.7 47.8 127 133.4 73.2 8 31.8 1-1/8. 203.2 22
4 311.2 53.8 157.2 162.1 90.4 8 35.1 1-1/4. 241.3 33
5 374.7 73.2 185.7 196.9 104.6 8 41.1 1-1/2. 292.1 59
6 393.7 82.6 215.9 228.6 119.1 12 38.1 1-3/8. 317.5 75
8 482.6 91.9 269.7 292.1 142.7 12 44.5 1-5/8. 393.7 118
10 584.2 108 323.9 368.3 158.8 12 50.8 1-7/8. 482.6 197
12 673.1 124 381 450.9 180.8 16 53.8 2 571.5 263
14 749.3 133.4 412.8 495.3 16 60.5 2-1/4. 635
16 825.5 146.1 469.9 552.5 16 66.5 2-1/2. 704.9
18 914.4 162.1 533.4 596.9 16 73.2 2-3/4. 774.7
20 984.3 177.8 584.2 641.4 16 79.2 3 831.9
24 1168.4 203.2 692.2 762 16 91.9 3-1/2. 990.6