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Slip On Flanges (SOFF & SORF) Manufacturer

Slip On Flanges Manufacturer

Slip-On Flanges Manufacturer, Supplier & Exporter – ASME B16.5 Slip-On Flanges (SORF, SOFF) with RF, FF & RTJ Facing, Dimensions, Weight & Pressure Class 150 to 2500

Slip-on flanges are one of the most widely used flange types in piping systems due to their ease of installation, cost efficiency, and strong alignment capabilities. Designed to slide over the pipe and then welded both internally and externally, these flanges provide enhanced strength and reduced leakage risk compared to single-weld configurations. Manufactured in accordance with ASME B16.5 and ANSI B16.47 standards, slip-on flanges are commonly used in low to medium pressure applications across oil & gas, petrochemical, power generation, and water treatment industries.

The structure of a slip-on flange allows for precise pipe positioning before welding, making it highly preferred in large-diameter piping systems where alignment is critical. Variations such as SORF (Slip-On Raised Face) and SOFF (Slip-On Flat Face) are selected based on gasket seating requirements and pressure class, while RTJ slip-on flanges are used in high-pressure and high-temperature environments requiring metal-to-metal sealing. Raised face configurations remain the most commonly used due to their superior sealing performance under fluctuating pressure conditions.

Available in a wide range of pressure ratings including Class 150, 300, 600, 900, 1500, and 2500, slip-on flanges are manufactured in sizes ranging from ½” to 48” and above, depending on project requirements. These flanges are extensively produced in materials such as Carbon Steel (ASTM A105), Stainless Steel (ASTM A182 F304/304L/316/316L), Alloy Steel (F11, F22), Duplex & Super Duplex (UNS S31803, S32205, S32750, S32760), and high-performance alloys like Inconel, Monel, Hastelloy, and Alloy 20, ensuring compatibility with aggressive environments and corrosive media.

In global markets such as the USA, UAE, Saudi Arabia, Qatar, and Oman, slip-on flanges are in high demand for pipeline infrastructure, refineries, offshore platforms, and EPC projects. Their cost advantage compared to weld neck flanges, combined with ease of fabrication and installation, makes them a preferred choice for contractors and project engineers handling bulk piping requirements.

ASME B16.5 Slip-On Flange Dimensions, ANSI B16.47 Series A/B Specifications, MSS SP-44 Reducing Type, AWWA C207 Class B/E, EN 1092-1 PN10 PN16, BS 10 Table D/E/F Pressure Rating & Weight Chart

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Standard Specifications of Slip-On Flanges

Standards ASME B16.5 (up to 24”), ASME B16.47 Series A & B (NPS 26” to 60”), MSS SP-44, EN 1092-1, BS 10, AWWA C207
Size Range ½” (15 NB) to 60” (1500 NB) and above (custom sizes available)
Pressure Class Class 150, 300, 600, 900, 1500, 2500 (equivalent to PN ratings as per international standards)
PN Ratings PN6, PN10, PN16, PN25, PN40
Facing Types Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Flange Types SORF, SOFF, Reducing Slip-On Flanges
Dimensional Tolerances As per ASME B16.5 / ASME B16.47 standards ensuring precision fit and interchangeability
Material Grades Carbon Steel: ASTM A105, ASTM A350 LF2, ASTM A694 F42/F52/F60/F65/F70
Stainless Steel: ASTM A182 F304/304L/304H, F316/316L/316H, F321, F347
Alloy Steel: ASTM A182 F1, F5, F9, F11, F22, F91
Duplex Steel: ASTM A182 F51 (UNS S31803), F60 (UNS S32205)
Super Duplex Steel: ASTM A182 F53 (UNS S32750), F55 (UNS S32760)
Nickel Alloys: ASTM B564 / B462 (Inconel 600/625/718, Incoloy 800/825, Monel 400/K500, Hastelloy C22/C276, Alloy 20)
Copper Alloys: ASTM B151 / B152 (Copper Nickel 90/10, 70/30, Brass, Bronze – Tin Bronze, Aluminium Bronze, Lead Bronze)
Other Materials: Aluminium, Titanium (Grade 2, Grade 5), Nickel 200/201, 254 SMO, Nimonic Alloys
Outer Diameter (OD) As per ASME B16.5, ASME B16.47, EN 1092-1, and BS standards
Pressure–Temperature Rating As per ASME B16.5 based on material grade and operating temperature
Bore Tolerance Slightly larger than pipe OD to allow slip-fit installation, as per ASME B16.5 tolerances
Service Suitability Suitable for low to moderate pressure systems, corrosive environments (depending on material), and general piping applications
Welding Details Double fillet weld (internal and external) ensuring proper alignment and strength
Thickness (T) Defined as per pressure class and standard dimensions
Bolt Circle Diameter (BCD) As per standard drilling dimensions
Number & Size of Bolt Holes Depends on size, class, and standard
Hub Dimensions Defined as per ASME/EN standards
Raised Face Height 1.6 mm (Class 150–300), 6.4 mm (Class 400–2500)
Surface Finish Stock finish (125–250 AARH (3.2–6.3 µm Ra)), spiral serrated, smooth finish
Connection Type Slip-on with double fillet weld (inside & outside)
End Connection Standard Compatible with ASME B36.10 / B36.19 pipe dimensions
Manufacturing Process Forged, machined, heat treated
Supply Condition Machined, drilled, ready-to-install condition with protective coating
Heat Treatment Normalizing, quenching, tempering, solution annealing (as per material grade)
Coating / Finish Anti-rust oil, black paint, hot-dip galvanizing, epoxy coating
Marking Size, material grade, pressure class, heat number, manufacturer logo
Testing PMI, Hydrostatic Testing, Ultrasonic Testing (UT), Radiography (RT), Mechanical Testing, Hardness Testing (HB), Impact Testing (Charpy)
Inspection Third-Party Inspection (TPI), client inspection, visual & dimensional checks
Certification EN 10204 3.1 / 3.2, NACE MR0175 / ISO 15156, ISO 9001:2015
Applications Oil & Gas, Petrochemical, Chemical Processing, Power Generation, Water Treatment, Desalination, Marine & Offshore, HVAC Systems, Fire Protection, LNG & Cryogenic Applications, Renewable Energy, Hydrogen Processing

ASME B16.5 Slip On Flange Dimensions, Size & Weight Chart

Slip on Flange Dimensions – Class 150 to Class 1500

Class 150 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 90 9.6 30 14 34.9 2 60.3 22.2 4 1/2 50 55 5/8 M14 0.8
3/4 20 100 11.2 38 14 42.9 2 69.9 27.7 4 1/2 50 65 5/8 M14 0.9
1 25 110 12.7 49 16 50.8 2 79.4 34.5 4 1/2 55 65 5/8 M14 0.9
1 1/4 32 115 14.3 59 19 63.5 2 88.9 43.2 4 1/2 55 70 5/8 M14 1.4
1 1/2 40 125 15.9 65 21 73 2 98.4 49.5 4 1/2 65 70 5/8 M14 1.4
2 50 150 17.5 78 24 92.1 2 120.7 61.9 4 5/8 70 85 3/4 M16 2.3
2 1/2 65 180 20.7 90 27 104.8 2 139.7 74.6 4 5/8 75 90 3/4 M16 3.2
3 80 190 22.3 108 29 127 2 152.4 90.7 4 5/8 75 90 3/4 M16 3.7
3 1/2 90 215 22.3 122 30 139.7 2 177.8 103.4 8 5/8 75 90 3/4 M16 5
4 100 230 22.3 135 32 157.2 2 190.5 116.1 8 5/8 75 90 3/4 M16 5.9
5 125 255 22.3 164 35 185.7 2 215.9 143.8 8 3/4 85 95 7/8 M20 6.8
6 150 280 23.9 192 38 215.9 2 241.3 170.7 8 3/4 85 100 7/8 M20 8.6
8 200 345 27 246 43 269.9 2 298.5 221.5 8 3/4 90 110 7/8 M20 13.7
10 250 405 28.6 305 48 323.8 2 362 276.2 12 7/8 100 115 1 M24 19.5
12 300 485 30.2 365 54 381 2 431.8 327 12 7/8 100 120 1 M24 29
14 350 535 33.4 400 56 412.8 2 476.3 359.2 12 1 115 135 1 1/8 M27 41
16 400 595 35 457 62 469.9 2 539.8 410.5 16 1 115 135 1 1/8 M27 54
18 450 635 38.1 505 67 533.4 2 577.9 461.8 16 1 1/8 125 145 1 1/4 M30 59
20 500 700 41.3 559 71 584.2 2 635 513.1 20 1 1/8 140 160 1 1/4 M30 75
24 600 815 46.1 663 81 692.2 2 749.3 616 20 1 1/4 150 170 1 3/8 M33 100

Class 300 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 95 12.7 38 21 34.9 2 66.7 22.2 4 1/2 55 65 5/8 M14 1.2
3/4 20 115 14.3 48 24 42.9 2 82.6 27.7 4 5/8 65 75 3/4 M16 1.4
1 25 125 15.9 54 25 50.8 2 88.9 34.5 4 5/8 65 75 3/4 M16 1.4
1 1/4 32 135 17.5 64 25 63.5 2 98.4 43.2 4 5/8 70 85 3/4 M16 1.8
1 1/2 40 155 19.1 70 29 73 2 114.3 49.5 4 3/4 75 90 7/8 M20 2.7
2 50 165 20.7 84 32 92.1 2 127 61.9 8 5/8 75 90 3/4 M16 3.2
2 1/2 65 190 23.9 100 37 104.8 2 149.2 74.6 8 3/4 85 100 7/8 M20 4.6
3 80 210 27 117 41 127 2 168.3 90.7 8 3/4 90 110 7/8 M20 5.9
3 1/2 90 230 28.6 133 43 139.7 2 184.2 103.4 8 3/4 95 110 7/8 M20 7.7
4 100 255 30.2 146 46 157.2 2 200 116.8 8 3/4 95 115 7/8 M20 10
5 125 280 33.4 178 49 185.7 2 235 144.4 8 3/4 110 120 7/8 M20 12.7
6 150 320 35 206 51 215.9 2 269.9 171.4 12 3/4 110 120 7/8 M20 17.7
8 200 380 39.7 260 60 269.9 2 330.2 222.2 12 7/8 120 140 1 M24 26
10 250 445 46.1 321 65 323.8 2 387.4 277.4 16 1 140 160 1 1/8 M27 36
12 300 520 49.3 375 71 381 2 450.8 328.2 16 1 1/8 145 170 1 1/4 M30 52
14 350 585 52.4 425 75 412.8 2 514.4 360.2 20 1 1/8 160 180 1 1/4 M30 75
16 400 650 55.6 483 81 469.9 2 571.5 411.2 20 1 1/4 165 190 1 3/8 M33 86
18 450 710 58.8 533 87 533.4 2 628.6 462.3 24 1 1/4 170 195 1 3/8 M33 113
20 500 775 62 587 94 584.2 2 685.8 514.4 24 1 1/4 185 205 1 3/8 M33 143
24 600 915 68.3 702 105 692.2 2 812.8 616 24 1 1/2 205 230 1 5/8 M39 216

Class 400 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 95 14.3 38 22 34.9 7 66.7 22.2 4 1/2 75 5/8 M14 1.3
3/4 20 115 15.9 48 25 42.9 7 82.6 27.7 4 5/8 90 3/4 M16 1.5
1 25 125 17.5 54 27 50.8 7 88.9 34.5 4 5/8 90 3/4 M16 1.8
1 1/4 32 135 20.7 64 29 63.5 7 98.4 43.2 4 5/8 95 3/4 M16 2.3
1 1/2 40 155 22.3 70 32 73 7 114.3 49.5 4 3/4 110 7/8 M20 3.2
2 50 165 25.4 84 37 92.1 7 127 61.9 8 5/8 110 3/4 M16 4.1
2 1/2 65 190 28.6 100 41 104.8 7 149.2 74.6 8 3/4 120 7/8 M20 5.9
3 80 210 31.8 117 46 127 7 168.3 90.7 8 3/4 125 7/8 M20 7.3
4 100 255 35 146 51 157.2 7 200 116.1 8 7/8 140 1 M24 11.8
5 125 280 38.1 178 54 185.7 7 235 143.8 8 7/8 145 1 M24 14.1
6 150 320 41.3 206 57 215.9 7 269.9 170.7 12 7/8 150 1 M24 20
8 200 380 47.7 260 68 269.9 7 330 221.5 12 1 170 1 1/8 M27 31
10 250 445 54 321 73 323.8 7 387.4 276.2 16 1 1/8 190 1 1/4 M30 42
12 300 520 57.2 375 79 381 7 450.8 327 16 1 1/4 205 1 3/8 M33 59
14 350 585 60.4 425 84 412.8 7 514.4 359.2 20 1 1/4 210 1 3/8 M33 82
16 400 650 63.5 483 94 469.9 7 571.5 410.5 20 1 3/8 220 1 1/2 M36 107
18 450 710 66.7 533 98 533.4 7 628.6 461.8 24 1 3/8 230 1 1/2 M36 130
20 500 775 69.9 587 102 584.2 7 685.8 513.1 24 1 1/2 240 1 3/4 M39 157
24 600 915 76.2 702 114 692.2 7 812.8 616 24 1 3/4 265 1 7/8 M45 232

Class 600 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 95 14.3 38 22 34.9 7 66.7 22.2 4 1/2 75 5/8 M14 1.3
3/4 20 115 15.9 48 25 42.9 7 82.6 27.7 4 5/8 90 3/4 M16 1.4
1 25 125 17.5 54 27 50.8 7 88.9 34.5 4 5/8 90 3/4 M16 1.8
1 1/4 32 135 20.7 64 29 63.5 7 98.4 43.2 4 5/8 95 3/4 M16 2.3
1 1/2 40 155 22.3 70 32 73 7 114.3 49.5 4 3/4 110 7/8 M20 3.2
2 50 165 25.4 84 37 92.1 7 127 61.9 8 5/8 110 3/4 M16 4.1
2 1/2 65 190 28.6 100 41 104.8 7 149.2 74.6 8 3/4 120 7/8 M20 5.9
3 80 210 31.8 117 46 127 7 168.3 90.7 8 3/4 125 7/8 M20 7.3
4 100 275 38.1 152 54 157.2 7 215.9 116.1 8 7/8 145 1 M24 16.8
5 125 330 44.5 189 60 185.7 7 266.7 143.8 8 1 165 1 1/8 M27 29
6 150 355 47.7 222 67 215.9 7 292.1 170.7 12 1 170 1 1/8 M27 36
8 200 420 55.6 273 76 269.9 7 349.2 221.5 12 1 1/8 190 1 1/4 M30 52
10 250 510 63.5 343 86 323.8 7 431.8 276.2 16 1 1/4 215 1 3/8 M33 77
12 300 560 66.7 400 92 381 7 489 327 20 1 1/4 220 1 3/8 M33 91
14 350 605 69.9 432 94 412.8 7 527 359.2 20 1 3/8 235 1 1/2 M36 105
16 400 685 76.2 495 106 469.9 7 603.2 410.5 20 1 1/2 255 1 5/8 M39 150
18 450 745 82.6 546 117 533.4 7 654 461.8 20 1 5/8 275 1 3/4 M42 182
20 500 815 88.9 610 127 584.2 7 723.9 513.1 24 1 5/8 285 1 3/4 M42 232
24 600 940 101.6 718 140 692.2 7 838.2 616 24 1 7/8 330 2 M48 332

Class 900 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 120 22.3 38 32 34.9 7 82.6 22.2 4 3/4 110 7/8 M20 1.8
3/4 20 130 25.4 44 35 42.9 7 88.9 27.7 4 3/4 115 7/8 M20 2.3
1 25 150 28.6 52 41 50.8 7 101.6 34.5 4 7/8 125 1 M24 3.6
1 1/4 32 160 28.6 64 41 63.5 7 111.1 43.2 4 7/8 125 1 M24 4.1
1 1/2 40 180 31.8 70 44 73 7 123.8 49.5 4 1 140 1 1/8 M27 5.5
2 50 215 38.1 105 57 92.1 7 165.1 61.9 8 7/8 145 1 M24 11.5
2 1/2 65 245 41.3 124 64 104.8 7 190.5 74.6 8 1 160 1 1/8 M27 16.5
3 80 240 38.1 127 54 127 7 190.5 90.7 8 7/8 145 1 M24 12
4 100 290 44.5 159 70 157.2 7 235 116.1 8 1 1/8 170 1 1/4 M30 24
5 125 350 50.8 190 79 185.7 7 279.4 143.8 8 1 1/4 190 1 3/8 M33 38
6 150 380 55.6 235 86 215.9 7 317.5 170.7 12 1 1/8 190 1 1/4 M30 50
8 200 470 63.5 298 102 269.9 7 393.7 221.5 12 1 3/8 220 1 1/2 M36 78
10 250 545 69.9 368 108 323.8 7 469.9 276.2 16 1 3/8 235 1 1/2 M36 112
12 300 610 79.4 419 117 381 7 533.4 327 20 1 3/8 255 1 1/2 M36 148
14 350 640 85.8 451 130 412.8 7 558.8 359.2 20 1 1/2 275 1 5/8 M39 182
16 400 705 88.9 508 133 469.9 7 616 410.5 20 1 5/8 285 1 3/4 M42 193
18 450 785 101.6 565 152 533.4 7 685.8 461.8 20 1 7/8 325 2 M48 258
20 500 855 108 622 159 584.2 7 749.3 513.1 20 2 350 2 1/8 M52 317
24 600 1040 139.7 749 203 692.2 7 901.7 616 20 2 1/2 440 2 5/8 M64 608

Class 1500 Slip-on Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thickness Hub OD Flange Length RF Dia. RF Height PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H
1/2 15 120 22.3 38 32 34.9 7 82.6 22.2 4 3/4 110 7/8 M20 1.8
3/4 20 130 25.4 44 35 42.9 7 88.9 27.7 4 3/4 115 7/8 M20 2.3
1 25 150 28.6 52 41 50.8 7 101.6 34.5 4 7/8 125 1 M24 3.7
1 1/4 32 160 28.6 64 41 63.5 7 111.1 43.2 4 7/8 125 1 M24 4.1
1 1/2 40 180 31.8 70 44 73 7 123.8 49.5 4 1 140 1 1/8 M27 5.5
2 50 215 38.1 105 57 92.1 7 165.1 61.9 8 7/8 145 1 M24 9.8
2 1/2 65 245 41.3 124 64 104.8 7 190.5 74.6 8 1 160 1 1/8 M27 16.4

DIN86029 PN10 HUBBED SLIP-ON FLANGE Dimensions

Rated Diameter O.D. of Pipe Flange Parameter Neck Size Size of R.F. Bolts Approx. Weight
DN d1 D d5 b k h d3 r d4 f No. of holes d2 KG
10 17.2 90 17.7 14 60 20 30 4 40 2 4 14 0.56
15 21.3 95 22 14 65 20 35 4 45 2 4 14 0.62
20 26.9 105 27.6 16 75 24 45 4 58 2 4 14 0.91
25 33.7 115 34.4 16 85 24 52 5 68 2 4 14 1.09
32 42.4 140 43.1 16 100 26 60 5 78 2 4 18 1.58
40 48.3 150 49 16 110 26 70 5 88 3 4 18 1.76
50 60.3 165 61.1 18 125 28 85 5 102 3 4 18 2.39
65 76.1 185 77.1 18 145 32 105 5 122 3 4 18 3.1
80 88.9 200 90.3 20 160 34 118 5 138 3 8 18 3.77
100 114.3 220 115.9 20 180 38 140 5 158 3 8 18 4.29
125 139.7 250 141.6 22 210 40 168 5 188 3 8 18 5.86
150 168.3 285 170.5 22 240 44 196 5 212 3 8 22 7.22
175 193.7 315 196.1 24 270 44 224 6 242 3 8 22 9.18
200 219.4 340 222 24 295 44 247 6 268 3 8 22 9.95
250 273 395 276 26 350 46 300 6 320 3 12 22 12.69
300 323.9 445 327 26 400 46 352 6 370 4 12 22 14.4
350 355.6 505 359 26 460 53 398 10 430 4 16 22 22.36
400 406.4 565 410 26 515 57 448 10 482 4 16 26 26.85
450 457 615 461 28 565 62 502 10 532 4 20 26 32.53
500 508 670 512 28 620 67 552 10 585 4 20 26 37.84
600 610 780 614 28 725 75 658 10 685 5 20 30 49.32
700 711 895 716 30 840 77 760 10 800 5 24 30 63.86
800 813 1015 818 32 950 84 864 10 905 5 24 33 85.19
900 914 1115 920 34 1050 88 969 10 1005 5 28 33 101.4
1000 1016 1230 1022 34 1160 92 1071 10 1110 5 28 36 119.7

Slip-On Flange Weight in Kgs.

NPS Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500
1/2 0.5 0.9 0.9 0.9 2.7 2.7
3/4 0.9 1.4 1.4 1.4 2.7 2.7
1 0.9 1.4 1.6 1.8 3.4 3.6
1¼ 1.4 2 2 2.3 4.5 4.5
1½ 1.4 2.9 2.9 3.2 6.3 6.3
2 2.3 3.2 3.6 4.1 9.9 11.3
2½ 3.6 4.5 5.4 5.9 13.9 16.2
3 4.1 5.9 6.8 7.2 16.2 21.6
3½ 4 7.7 9.5 9.5
4 5.9 10.6 11.7 16.7 23.9 32.9
5 6.8 13 13.9 28.4 37.4 59.4
6 8.6 17.6 19.8 36 49.5 74.3
8 13.5 26.1 30.2 51.8 77.4 117
10 19.4 36.5 40 79.7 110.3 196.2
12 28.8 51.8 58.5 96.8 146.7 300.2
14 40.5 74.3 85 116.6 180 423
16 47.7 94.5 113.9 164.7 206.6 562.5
18 58.5 113.9 139.5 214.2 291.2 731.3
20 74.3 141.8 170.1 275.4 356.4 922.5
22 83.3 166.5 182.3 265.5
24 99 220.5 242.6 394.2 666 1271

Slip-On Flange Weight in LBS.

Nominal Pipe Size CLASS 150 CLASS 300 CLASS 400 CLASS 600 CLASS 900 CLASS 1500
½ 1 2 2 2 6 6
¾ 2 3 3 3 6 6
1 2 3 3.5 4 7.5 8
1¼ 3 4.5 4.5 5 10 10
1½ 3 6.5 6.5 7 14 14
2 5 7 8 9 22 25
2½ 8 10 12 13 31 36
3 9 13 15 16 36 48
3½ 11 17 21 21 - -
4 13 23.5 26 37 53 73
5 15 29 31 63 83 132
6 19 39 44 80 110 165
8 30 58 67 115 172 260
10 43 81 91 177 245 436
12 64 115 130 215 326 667
14 90 165 191 259 400 940
16 106 210 253 366 459 1250
18 130 253 310 476 647 1625
20 165 315 378 612 792 2050
22 185 370 405 590 - -
24 220 490 539 876 1480 2825

Frequently Asked Questions – Slip On Flanges

How are slip-on flanges installed?

Slip-on flanges are installed by sliding the flange over the pipe to the required position, usually leaving a slight gap from the pipe end to ensure proper weld penetration. The flange is then carefully aligned and tack welded to maintain positioning. Final installation involves fillet welding on both the inside and outside of the flange, which provides adequate strength and leak-tight sealing.

This installation method makes slip-on flanges a cost-effective and easy-to-fit solution, especially for low to moderate pressure piping systems where quick alignment and efficient fabrication are required.

They are generally not preferred for high-pressure or highly critical applications, as the double fillet weld construction provides lower strength compared to weld neck designs. These flanges are better suited for low to moderate pressure systems, where ease of installation and cost efficiency are important. With proper material selection and welding practices, they can still perform reliably in many industrial environments.

Across global industries, they are widely used in:

  • Oil & Gas Industry
  • Petrochemical Industry
  • Chemical Processing Industry
  • Power Generation Industry
  • Water Treatment & Desalination
  • Marine & Shipbuilding Industry
  • Pharmaceutical & Biotech Industry
  • Food, Beverage & Dairy Industry
  • Pulp & Paper Industry
  • Mining & Mineral Processing Industry
  • HVAC, Fire Protection & Utility Systems
  • Cryogenic Applications
  • Aerospace & Defense Industry
  • Heavy Engineering & Industrial Equipment
  • Renewable Energy Industry
  • Hydrogen & Gas Processing Industry
  • LNG & Industrial Gas Industry
  • Data Centers & Cooling Infrastructure
  • District Cooling Systems
  • Cement Industry

The inner diameter (ID) is typically manufactured slightly larger than the pipe outer diameter (OD) to allow easy fit-up and alignment during installation. This clearance is usually maintained within a small positive tolerance (commonly around +1.5 mm to +3 mm, depending on size and standard) to ensure smooth slipping without excessive play.

Tolerances are governed by standards such as ASME B16.5 and may vary based on flange size, pressure class, and material, so it is important to confirm exact dimensions as per project specifications.

Yes, they can be used in corrosive environments when the appropriate corrosion-resistant material is selected. Common choices include stainless steel grades such as 304/304L and 316/316L, duplex grades like UNS S31803 / S32205, super duplex grades such as UNS S32750 / S32760, and nickel alloys including Inconel 625, Inconel 825, Hastelloy C276, and Monel 400.

The selection depends on factors such as chemical exposure, temperature, pressure, and chloride content. In highly aggressive environments, using higher alloyed materials along with proper surface finish and gasket compatibility ensures long-term corrosion resistance and reliability.

Global supply is handled by MTA – Metal Tech Alloys Private Limited, an experienced exporter and supplier operating under certified systems including ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and PED (Pressure Equipment Directive). Orders are delivered with EN 10204 3.1 Mill Test Certificates (MTC), along with third-party inspection (if required) and secure export packaging to ensure quality, compliance, and traceability.

Deliveries are regularly made across the Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain), as well as Europe, the USA, Southeast Asia, and Africa, supporting a wide range of industrial and infrastructure projects.

Afghanistan Armenia Azerbaijan Bahrain
Bangladesh Bhutan Brunei Cambodia
Yemen Vietnam Georgia India
Indonesia Iran Iraq Israel
Japan Jordan Kazakhstan Kuwait
Kyrgyzstan Laos Lebanon Malaysia
Maldives Mongolia Myanmar Nepal
North Korea Oman Pakistan Palestine
Philippines Qatar Saudi Arabia Singapore
South Korea Sri Lanka Syria Taiwan
Tajikistan Thailand Timor-Leste Turkey
Turkmenistan United Arab Emirates Uzbekistan
Algeria Angola Benin Botswana
Burkina Faso Burundi Cabo Verde Cameroon
Central African Republic Chad Comoros Democratic Republic of the Congo
Republic of the Congo Djibouti Egypt Equatorial Guinea
Eritrea Eswatini Ethiopia Gabon
Gambia Ghana Guinea Guinea-Bissau
Ivory Coast Kenya Lesotho Liberia
Libya Madagascar Malawi Mali
Mauritania Mauritius Morocco Mozambique
Namibia Niger Nigeria Rwanda
Sao Tome and Principe Senegal Seychelles Sierra Leone
Somalia South Africa South Sudan Sudan
Tanzania Togo Tunisia Uganda
Zambia Zimbabwe
Albania Andorra Austria Belarus
Belgium Bosnia and Herzegovina Bulgaria Croatia
Cyprus Czech Republic Denmark Estonia
Finland France Germany Greece
Hungary Iceland Ireland Italy
Kosovo Latvia Liechtenstein Lithuania
Luxembourg Malta Moldova Monaco
Montenegro Netherlands North Macedonia Norway
Poland Portugal Romania Russia
San Marino Serbia Slovakia Slovenia
Spain Sweden Switzerland Ukraine
United Kingdom Vatican City
Antigua and Barbuda Argentina Bahamas Barbados
Belize Bolivia Brazil Canada
Chile Colombia Costa Rica Cuba
Dominica Dominican Republic Ecuador El Salvador
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Placing an order is quick and straightforward. Share your requirement with complete technical details such as size (½” to 60”), pressure class (Class 150 to 2500), material grade (Carbon Steel, Stainless Steel, Alloy Steel, Duplex & Super Duplex, Nickel Alloys), flange facing (RF, FF, RTJ), and required quantity.

Our team at Metal Tech Alloys Private Limited (MTA) carefully reviews your specifications in line with ASME, ASTM, and ANSI standards to ensure accuracy and compliance. Based on your requirement, we provide a detailed quotation including pricing, delivery timeline, packaging, and shipping terms (FOB, CIF, etc.).

To quickly place your order or request a quote (RFQ), simply email your requirements to sales@metaltechalloys.com. Our team responds promptly with the best technical and commercial solution tailored to your project. For complete contact details, click here.

With strong global supply capabilities, MTA ensures reliable delivery, consistent quality, and complete support from inquiry to final dispatch.