Slip On Flange

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$USD 20 $USD 15

Sealing Face: RF, FF, FTJ Size Range: 1/2" - 24" / DN15 - DN600 Pressure Rating: Class 150, 300, 600, 900, 1500, 2500lb

SKU: ZZ102 Category:

What is a slip on flange?

A slip on flange is a type of flange used in piping systems to connect two pipes or a pipe to a valve, pump, or other equipment. It’s called a “slip-on” flange because it slips over the pipe, and then it’s welded in place to secure the connection. The advantage of slip on flange including saves space during use and has lower weight. The outstanding one is it has great sealing performance which ensures no leakage on the head part.This type of flange is commonly used in industries like oil and gas, chemical processing, and water treatment.

How It Works:

The welding creates a permanent bond between the pipe and the flange.

The bolted connection to another piece of equipment ensures that the two systems are securely connected and can handle the pressure and flow of whatever is moving through the pipe.

The seal formed by the welded connection and the bolted connection is what prevents leaks and allows the system to maintain its pressure.

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.

Installation Process: 

Slip the Flange onto the Pipe: The first step in installation is to slide the slip-on flange over the pipe, making sure it fits snugly.

Align the Bolt Holes: Once the flange is in position, the bolt holes in the flange should align with those on the connected equipment (like a valve, another pipe, or pump).

Welding: After ensuring proper alignment, the flange is welded to the pipe at both the inner and outer edges, securing the flange to the pipe and preventing leaks.

Bolting: The flange is then bolted to the matching flange of the connecting equipment. The bolts go through the bolt holes, securing the flange to the other component, creating a tight seal.

Standard Specification For Slip On Flange

Sealing Face RF, FF, FTJ
Size Range 1/2” – 48” / DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
ASME Standard ASME / ANSI B16.5, ASME B16.47 Series A/B
EN Standard EN 1092-1
DIN Standard DIN 86029
BS Standard BS 3293
JIS Standard JIS B2220

Material & Grades of Threaded Flange :

Carbon Steel Slip On Flanges :

ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70

Alloy Steel Slip On Flanges :

ASTM A 182 F5, F9, F11, F12, F22, F91

Stainless Steel Slip On Flanges :

ASTM A 182 F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L

Duplex & Super Duplex Steel Slip On Flanges :

ASTM A 182 F 44, F 45, F51, F 53, F 55, F 60, F 61

Copper Alloy Steel Slip On Flanges :

 ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Slip On Flanges :

ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C276 (UNS No.N10276), Alloy 20 (UNS No. N08020)

Type of Slip On Flanges Based on the Face

1. Raised Face (RF)

The most common sealing face for slip-on flanges. The raised face is a small area that is raised above the flange’s main surface.

2. Flat Face (FF)

The flat face is completely level with the flange surface. There is no raised area, and the sealing surface is the entire face of the flange.

3. Ring Type Joint (RTJ)

The Ring Type Joint (RTJ) is a specialized sealing face with a groove around the flange face that holds a metal ring gasket. This type of face is more commonly found on high-pressure systems, particularly in industries like oil and gas.

Slip On Flange vs Weld Neck Flange

Slip-on flanges’ simplicity and cost-effectiveness result from their sliding over the pipe, followed by welding them in place, which makes them ideal for low to medium-pressure applications. In contrast, weld neck flanges incorporate a long tapered neck that someone welds directly to the pipe, offering a stronger and more durable connection, especially for high-pressure systems. While installers more easily install slip-on flanges, and their cost is lower, weld neck flanges better suit critical, high-stress applications due to their superior strength and ability to evenly distribute pressure.

Advantages of Slip On Flange

  •  Easy and quick installation with minimal alignment requirements.
  •  Cost-effective, reducing both material and labor costs.
  •  Versatility in size, pressure ratings, and materials.
  •  Lower stress on the pipe, ideal for moderate pressure systems.
  •  Easier to modify or replace during system changes or maintenance.
  •  Well-suited for low to medium-pressure systems with a simple and reliable seal.
  •  No special equipment or complex welding required for installation.

Applications for Slip On Flanges:

Water and wastewater systems

HVAC systems

Oil and gas industry

Chemical and petrochemical industries

Industrial piping

Marine and offshore applications

Power plants

Food and beverage industry

Non-critical applications

After Service

We guarantee that we inspect the product according to the corresponding standards or customer requirements, and furthermore, we provide an EN10204 3.1 material list. Subsequently, if customers have any doubts after receiving the goods, we will patiently answer them one by one to ensure that every customer is at ease.

Frequently Asked Questions (FAQs)

1. What is the difference between a lap flange and a slip-on flange?

A lap flange’s design inserts the pipe end into the flange, and someone then welds the flange to the pipe, creating a lap joint. This type of flange allows easier disassembly and maintenance, as one can remove the pipe without damaging the flange. In contrast, a slip-on flange slides over the pipe, and someone then welds it both inside and outside, making it a simpler, more cost-effective option for permanent connections. 

2. What is the difference between SW and slip on flange?

The main difference between a SW (Socket Weld) flange and a slip-on flange lies in their design and installation method. A SW flange is designed to be welded into the pipe, with the pipe inserted into the flange socket, creating a strong, internal weld that provides a smooth, continuous flow path.  In contrast, a slip-on flange slides over the pipe and is then welded both inside and outside. It is generally easier and quicker to install than a SW flange and is more cost-effective, though typically used for lower-pressure systems where the connection doesn’t require the strength of a socket weld.

Dimension of ASME B16.5 Slip On Flange

Class 150 lb
Nominal
Pipe Size		 A B C D F G H I J Weight
inch mm mm mm mm mm mm mm Holes mm mm kg / piece
1/2 21.3 88.9 22.4 11.2 15.7 30.2 35.1 4 15.7 60.45 0.39
3/4 26.7 98.6 27.7 12.7 15.7 38. 10 42.9 4 15.7 69.85 0.56
1 33.4 108 34.5 14.2 17.5 49.3 50.8 4 15.7 79.25 0.78
11/4 42.2 117.3 43.2 15.7 20.6 58.7 63.5 4 15.7 88.9 1.03
11/2 48.3 127 49.5 17.5 22.4 65 73.15 4 15.7 98.6 1.32
2 60.3 152.4 62 19.1 25.4 77.7 91.9 4 19.1 120.7 2.06
21/2 73 177.8 74.7 22.4 28.4 90.4 104.6 4 19.1 139.7 3.28
3 88.9 190.5 90.7 23.9 30.2 108 127 4 19.1 152.4 3.85
31/2 101.6 215.9 103.4 23.9 31.75 122.2 139.7 8 19.1 177.8 4.81
4 114.3 228.6 116.1 23.9 33.3 134.9 157.2 8 19.1 190.5 5.30
5 141.3 254 143.8 23.9 36.6 163.6 185.7 8 22.4 215.9 6.07
6 168.3 279.4 170.7 25.4 39.6 192 215.9 8 22.4 241.3 7.45
8 219.1 342.9 221.5 28.4 44.5 246.1 269.7 8 22.4 298.5 12.1
10 273 406.4 276.3 30.2 49.3 304.8 323.9 12 25.4 362 16.5
12 323.8 482.6 327.1 31.75 55.6 365.3 381 12 25.4 431.8 26.2
14 355.6 533.4 359.1 35.1 57.15 400.1 412.8 12 28.4 476.3 34.6
16 406.4 596.9 410.5 36.6 63.5 457.2 469.9 16 28.4 539.8 44.8
18 457.2 635 461.8 39.6 68.3 505 533.4 16 31.75 577.9 48.9
20 508 698.5 513.1 42.9 73.15 558.8 584.2 20 31.75 635 61.9
24 609.6 812.8 616 47.8 82.6 663.4 692.2 20 35.1 749.3 86.9

 

Class 300 lb
Nominal
Pipe Size		 A B C D F G H I J Weight
inch mm mm mm mm mm mm mm Holes mm mm kg / piece
1/2 21.3 95.2 22.4 14.2 22.4 38.1 35.1 4 15.7 66.55 0.64
3/4 26.7 27.7 15.7 25.4 47.7 42.9 4 19.1 82.5 1. 12
1 33.4 123.9 34.5 17.5 26.9 53.8 50.8 4 19.1 88.9 1.36
11/4 42.2 133.3 43.2 19 26.9 63.5 63.5 4 19.1 98.6 1.68
11/2 48.3 155.4 49.5 20.6 30.2 69.85 73.15 4 22.4 4.500
114.3		 2.49
2 60.3 165.1 62 22.3 33.2 84 91.9 8 19.1 127 2.87
21/2 73 190.5 74.7 25.4 38.1 100 104.6 8 22.4 149.4 4.32
3 88.9 209.5 90.7 28.4 42.9 117.3 127 8 22.4 168.1 5.85
31/2 101.6 228.6 103.4 30.2 44.4 133.3 139.7 8 22.4 184.2 7.34
4 114.3 254 116.1 31.7 47.7 146 157.2 8 22.4 200.1 9.61
5 141.3 279.4 143.8 35 50.8 177.8 185.7 8 22.4 234.9 12.3
6 168.3 317.5 170.7 36.5 52.3 206.2 215.9 12 22.4 269.7 15.6
8 219. 1 381 221.5 41.1 61.9 260.3 269.7 12 25.4 330.2 24.2
10 273 444.5 276.3 47.7 66.55 320.5 323.9 16 28.4 387.3 34.1
12 323.8 520.7 327.1 50.8 73.15 374.6 381 16 31.7 450.8 49.8
14 355.6 584.2 359.1 53.8 76.2 425.4 412.8 20 31.7 514.4 69.9
16 406.4 647.7 410.5 57.15 82.5 482.6 469.9 20 35 571.5 88.1
18 457.2 711.2 461.8 60.45 88.9 533.4 533.4 24 35 628.7 109
20 508 774.7 513.1 63.5 95.2 587.2 584.2 24 35 685.8 134
24 609.6 914.4 616 69.85 106.4 701.5 692.2 24 41 812.8 201

 

Class 400 lb
Nominal
Pipe Size		 A B C D F G H I J Weight
inch mm mm mm mm mm mm mm Holes mm mm kg / piece
1/2 21.3 95.3 22.4 14.2 22.4 38.1 35. 10 4 15.7 66.55 0.74
3/4 26.7 117.3 27.7 15.7 25.4 47.7 42.9 4 19.1 82.5 1.27
1 33.4 124 34.5 17.5 26.9 53.8 50.8 4 19.1 88.9 1.52
11/4 42.2 133.4 43.2 20.6 28.4 63.5 63.5 4 19.1 98.6 2.03
11/2 48.3 155.4 49.5 22.4 31.75 69.85 73. 15 4 22.4 114.3 2.96
2 60.3 165.1 62 25.4 36.6 84 91.9 8 19.1 127 3.62
21/2 73 190.5 74.7 28.4 41.1 100 104.6 8 22.4 149.4 5.28
3 88.9 209.6 90.7 31.75 46 117.3 127 8 22.4 168. 1 7.00
31/2 101.6 228.6 103.4 35.1 49.3 133.3 139.7 8 25.4 184.2 8.84
4 114.3 254 116.1 35.1 50.8 146 157.2 8 25.4 200. 1 11. 1
5 141.3 279.4 143.8 38.1 53.8 177.8 185.7 8 25.4 234.9 13.9
6 168.3 317.5 170.7 41.1 57.15 206.2 215.9 12 25.4 269.7 18.3
8 219.1 381 221.5 47.8 68.3 260.3 269.7 12 28.4 330.2 28.6
10 273 444.5 276.3 53.8 73.15 320.5 323.9 16 31.75 387.3 39.2
12 323.8 520.7 327. 1 57.15 79.25 374.6 381 16 35.1 450.8 57.0
14 355.6 584.2 359. 1 60.05 84.1 425.4 412.8 20 35.1 514.4 79.1
16 406.4 647.7 410.5 63.5 93.7 482.6 469.9 20 38.1 571.5 101
18 457.2 711.2 461.8 66.55 98.6 533.4 533.4 24 38.1 628.7 123
20 508 774.7 513. 1 69.85 101.6 587.2 584.2 24 41.1 685.8 146
24 609.6 914.4 616 76.2 114.3 701.5 692.2 24 47.8 812.8 219

 

Class 600 lb
Nominal
Pipe Size		 A B C D F G H I J Weight
inch mm mm mm mm mm mm mm Holes mm mm kg / piece
1/2 21.3 95.3 22.4 14.2 22.4 38.1 35.1 4 15.7 66.55 0.74
3/4 26.7 117.3 27.7 15.7 25.4 47.8 42.9 4 19.1 82.6 1.27
1 33.4 124 34.5 17.5 26.9 53.8 50.8 4 19.1 88.9 1.52
11/4 42.2 133.4 43.2 20.6 28.4 63.5 63.5 4 19.1 98.6 2.03
11/2 48.3 155.4 49.5 22.4 31.75 69.85 73.15 4 22.4 114.3 2.96
2 60.3 165.1 62 25.4 36.6 84.1 91.9 8 19.1 127 3.62
21/2 73 190.5 74.7 28.4 41.1 100.1 104.6 8 22.4 149.4 5.28
3 88.9 209.6 90.7 31.75 46 117.3 127 8 22.4 168.1 7.00
31/2 101.6 228.6 103.4 35.1 49.3 133.4 139.7 8 25.4 184.2 8.84
4 114.3 273.1 116.1 38.1 53.8 152.4 157.2 8 25.4 215.9 14.5
5 141.3 330.2 143.8 44.5 60.45 189 185.7 8 28.4 266.7 24.4
6 168.3 355.6 170.7 47.8 66.55 222.3 215.9 12 28.4 292.1 28.7
8 219. 1 419.1 221.5 55.6 76.2 273.1 269.7 12 31.75 349.3 43.4
10 273 508 276.3 63.5 85.9 342.9 323.9 16 35.1 431.8 70.3
12 323.8 558.8 327.1 66.55 91.9 400.1 381 20 35.1 489 84.2
14 355.6 603.3 359.1 69.85 93.7 431.8 412.8 20 38.1 527.1 98.7
16 406.4 685.8 410.5 76.2 106.4 495.3 469.9 20 41.1 603.3 142
18 457.2 743 461.8 82.6 117.3 546.1 533.4 20 44.5 654.1 173
20 508 812.8 513.1 88.9 127 609.6 584.2 24 44.5 723.9 220
24 609.6 939.8 616 101.6 139.7 717.6 692.2 24 50.8 838.2 312

 

Class 900
Nominal
Pipe Size		 A B C D F G H I J Weight
inch mm mm mm mm mm mm mm Holes mm mm kg / piece
1/2 21.3 120.6 22.4 22.4 31.7 38. 10 35.1 4 22.4 82.5 1.74
3/4 26.7 130 27.7 25.4 35 44.4 42.9 4 22.4 88.9 2.34
1 33.4 149.3 34.5 28.4 41.1 52.3 50.8 4 25.4 101.6 3.44
11/4 42.2 158.7 43.2 28.4 41.1 63.5 63.5 4 25.4 111.2 3.91
11/2 48.3 177.8 49.5 31.7 44.5 69.85 73.15 4 28.4 123.9 5.36
2 60.3 215.9 62 38.1 57.15 104.6 91.9 8 25.4 165.1 9.85
21/2 73 244.3 74.7 41.1 63.5 123.9 104.6 8 28.4 190.5 13.7
3 88.9 241.3 90.7 38.1 53.8 127 127 8 25.4 190.5 11.6
4 114.3 292.1 116.1 44.4 69.85 158.7 157.2 8 31.7 234.9 19.7
5 141.3 349.2 143.8 50.8 79.25 190.5 185.7 8 35 279.4 31.9
6 168.3 381 170.7 55.6 85.8 234.9 215.9 12 31.7 317.5 41.1
8 219.1 469.9 221.5 63.5 101.6 298.4 269.7 12 38.1 393.7 70.7
10 273 546.1 276.3 69.85 107.9 368.3 323.9 16 38.1 469.9 101
12 323.8 609.6 327.1 79.25 117.3 419.1 381 20 38.1 533.4 133
14 355.6 641.3 359.1 85.8 130 450.8 412.8 20 41.1 558.8 153
16 406.4 704.8 410.5 88.9 133.3 508 469.9 20 44.4 615.9 185
18 457.2 787.4 461.8 101.6 152.4 565.1 533.4 20 50.8 685.8 258
20 508 857.2 513.1 107.9 158.7 622.3 584.2 20 53.8 749.3 317
24 609.6 1041.4 616 139.7 203.2 749.3 692.2 20 66.55 901.7 606

 

Class 1500
Nominal
Pipe Size		 A B C D F G H I J Weight
inch mm mm mm mm mm mm mm Holes mm mm kg / piece
1/2 21.3 120.6 22.4 22.4 31.7 38.1 35.1 4 22.4 82.5 1.74
3/4 26.7 130 27.7 25.4 35 44.4 42.9 4 22.4 88.9 2.34
1 33.4 149.3 34.5 28.4 41.1 52.3 50.8 4 25.4 101.6 3.44
11/4 42.2 158.7 43.2 28.4 41.1 63.5 63.5 4 25.4 111.2 3.91
11/2 48.3 177.8 49.5 31.7 44.5 69.85 73.15 4 28.4 123.9 5.36
2 60.3 215.9 62 38.1 57.15 104.6 91.9 8 25.4 165.1 9.85
21/2 73 244.3 74.7 41.1 63.5 123.9 104.6 8 28.4 190.5 13.7

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