A Kammprofile gasket (or Camprofile and Grooved gasket) is manufactured by applying a sealing layer in non-metallic materials (such as graphite, PTFE-Teflon, ceramic fibers, non-asbestos, Mica, etc) or metallic materials (as aluminum or silver) on both sides of a metal core featuring concentric grooves of 1 mm Cam-Pitch (and a maximum depth of 0.5 mm). An outer metallic (integral or floating) ring may be added to the gasket, to facilitate the centering of the gasket during the installation on a flange. The sealing layers protect the flange surface and reinforce the seal.

 

Kammprofile gaskets are used in many industrial, petrochemical, power generation and nuclear installations (to seal flanges, heat exchangers, superheaters and, other pressure equipment) and are preferred to Spiral Wound Gaskets for processes with constant high pressure/temperatures requiring strong bolt-loads and remarkable flanged joints’ resistance.

 

kamprofile gasket

 

Kammprofile gaskets fit smooth and stock flange surface finish (3.2 to 6.3 μm Ra, i.e. 125-250 RMS). The common thickness of a Kammprofile gasket is between 2 and 4 mm (3 mm is the most common specification in petrochemical applications).

A Kammprofile gasket offers several benefits, due to its wide sealing area and construction:

  • May resist temperatures up to approx. 1000°C (the Kammprofile temperature rating depends on the materials of the metal core and the sealing layer)
  • May rate up to 250 bars, which is a considerable pressure rating
  • The gasket does not damage the flange surface, due to the protection offered by the sealing layer
  • The gasket can absorb fluctuations of temperature and pressure
  • It is more tolerant than Spiral Wound Gaskets to improper bolting torques
  • Suits both light and heavyweight flanges, even of large sizes
  • After assembly, the thickness of the sealing material is extremely low (0.1 – 0.2 mm), thus reducing leaks and failure rates
  • The core of a Kammprofile gasket can be re-used after cleaning and fitting the gasket with a new layering material. This is critical for expensive applications, such as heat exchanger gaskets that are made of exotic, expensive, materials (Inconel, Monel, Hastelloy and Cupronickel).

Kamprofile gasket grooved

 

KAMMPROFILE GASKET DESIGN

Kammprofile gaskets are available in two main configurations, parallel root cores/convex root cores, and two designs (with/without loose outer centering ring), as shown in the image below:

Kammprofile Gasket Designs

KAMMPROFILE GASKET MATERIALS

CORE MATERIALS FOR KAMMPROFILE GASKET

The core material of a Kammprofile gasket shall match the material of the piping system

Kammprofile Core Materials DIN
Designation
DIN Material Number AISI ASTM UNS
Designation
British Standard
Designation
Hardness
HB/HV
Temperature in C°
Min.           Max.
Density in gr/cm3
Soft Iron 90  –  100 –  60 500 7.85
Steel (LCS) RSt. 37.2 1.0038 100  –  130 –  40 500 7.85
Stainless Steel 304 X5 CrNi 1810 1.4301 304 304S15/16/31 130  –  180 -250 550 7.9
Stainless Steel 304 L X2CrNi 1911 1.4306 304L 304S11 130  –  190 -250 550 7.9
Stainless Steel 309 X15CrNiSi 2012 1.4828 309 309S24 130  –  190 -100 1000 7.9
Stainless Steel 316 L(1) X2CrNiMo 1713 1.4404 316L 316S11/13 130  –  190 -100 550 7.9
Stainless Steel 316 Ti X6CrNiMoTi 1712 1.4571 316Ti 320S31 130  –  190 -100 550 7.8
Stainless Steel 321 X6CrNiTi 1810 1.4541 321 321S12/49/87 130  –  190 -250 550 7.9
Stainless Steel 347 X6CrNiNb 1810 1.4550 347 347S31 130  –  190 -250 550 7.9
Aluminium Al 99,5 3.0255 20  –    23 -250 300 2.73
Silver 28* -250 750 10.5
Copper 2.0090 50  –    80 -250 400 8.9
Nickel 200 Ni 99,2 2.4066 N02200 3072-76 NA11 90  –  120 -250 600 8.9
Monel 400 ® NiCu 30 Fe 2.4360 N04400 3072-76 NA13 110  –  150 -125 600 8.8
Inconel 600 ® NiCr 15 Fe 2.4816 N06600 3072-76 NA14 120  –  180 -100 950 8.4
Incoloy 800 ® X10NiCrAITi 3220 1.4876 N08800 3072-76 NA15 140  –  220 -100 850 8.0
Incoloy 825 ® NiCr 21 Mo 2.4858 N08825 3072-76 NA16 120  –  180 -100 450 8.14
Hastelloy B2 ® NiMo 28 2.4617 N10665 170  –  230 -200 450 9.2
Hastelloy C276 ® NiMo16Cr15W 2.4819 N10276 170  –  230 -200 450 8.9
Titanium Ti 99,8 3.7025 110  –  140 -250 350 4.5

 

SEALING LAYER MATERIALS FOR KAMMPROFILE GASKET

The most common layer materials for Kammprofile gaskets are graphite and PTFE (Teflon).

The advantages of a graphite layering material are:

  • Excellent gas tightness qualities
  • Non-aging properties
  • Very good chemical resistance
  • Resistance to high (fluctuating) temperatures and pressures

PTFE is also used due to its excellent chemical resistance, resistance to temperatures up to 250°C  and excellent sealing properties for gas applications.

Sealing Layer Material for Kammprofile Temperature in C°
Min.     Max.
Max. operating pressure in Bars Gas tightness Recommended Application
Graphite -200 550 250 Good Aggressive media
PTFE (Teflon ® ) -200 250 100 Good Aggressive media
Non-asbestos -100 250 100 Good Gas and liquids
Silver -200 750 250 Good Aggressive media

 

KAMMPROFILE GASKET DIMENSIONS (FOR ASME B16.5 FLANGES)

Kammprofile Gaskets Dimensions Class 150-400

Kammprofile gasket size

NPS d1 d2 d3
150 300 400
1/2 23 33.3 44.4 50.8 50.8
3/4 28.6 39.7 53.9 63.5 63.5
1 36.5 47.6 63.5 69.8 69.8
44.4 60.3 73 79.4 79.4
52.4 69.8 82.5 92.1 92.1
2 69.8 88.9 101.6 108 108
82.5 101.6 120.6 127 127
3 98.4 123.8 133.4 146.1 146.1
111.1 136.5 158.8 161.9 158.7
4 123.8 154 171.5 177.8 174.6
5 150.8 182.6 193.7 212.7 209.5
6 177.8 212.7 219.1 247.7 244.5
8 228.6 266.7 276.2 304.8 301.6
10 282.6 320.7 336.5 358.8 355.6
12 339.7 377.8 406.4 419.1 415.9
14 371.5 409.6 447.7 482.6 479.4
16 422.3 466.7 511.2 536.6 533.4
18 479.4 530.2 546.1 593.7 590.5
20 530.2 581 603.2 650.9 644.5
24 631.8 682.6 714.4 771.5 765.2

All values in millimeters

 

Kammprofile Gaskets Dimensions Class 600-2500

Kammprofile gasket size

NPS d1 d2 d3
600 900 1500 2500
1/2 23 33.3 50.8 60.3 60.3 66.7
3/4 28.6 39.7 63.5 66.7 66.7 73
1 36.5 47.6 69.8 76.2 76.2 82.5
44.4 60.3 79.4 85.7 85.7 101.6
52.4 69.8 92.1 95.2 95.2 114.3
2 69.8 88.9 108 139.7 139.7 142.8
82.5 101.6 127 161.9 161.9 165.1
3 98.4 123.8 146.1 165.1 171.5 193.7
111.1 136.5 158.7
4 123.8 154 190.5 203.2 206.4 231.7
5 150.8 182.6 238.1 244.5 250.8 276.2
6 177.8 212.7 263.5 285.8 279.4 314.3
8 228.6 266.7 317.5 355.6 349.3 384.1
10 282.6 320.7 369.9 431.8 431.8 473
12 339.7 377.8 454 495.3 517.5 546.1
14 371.5 409.6 488.9 517.5 574.7
16 422.3 466.7 561.9 571.5 638.1
18 479.4 530.2 609.6 635 701.7
20 530.2 581 679.5 695.3 752.4
24 631.8 682.6 787.4 835 898.5

All values in millimeters