Continental Trade Sp. z o. o.

Sealing

Metallic/semi-metallic gaskets

Spiral wound gaskets

General characteristics

The sealing part of the Spiratem gasket consists of a metal strip spirally wound together with a soft sealing filler. The metal strip gives the gasket excellent flexibility properties, while the pliable sealing filler ensures high sealing performance. Thanks to this material combination, spiral wound gaskets are suitable in applications with highly fluctuating pressures and temperatures of sealed media. Depending on the solution, spiral gaskets may have an outer and / or internal ring.

 

  • Spiral wound gaskets are suitable for a wide pressure and temperature ranges.
  • Spiral wound gaskets can be used for pressures up to 25 MPa and temperatures from -200°C to +550°C / 1100°C (on special request).
  • Thanks to its design it can be easily installed without causing and damage.
  • The outside guide ring is used to centre the spiral sealing part against the flange and prevents the gasket from blowing out.
  • By combination of various materials and metals, the gaskets can be used in a wide range of operation conditions according to customer specification.
  • The spiral wound gasket does not damage flange surfaces.
  • Thanks to the non-adhesive properties of the spiral wound gasket, it can be easily removed during disassembly.

Standard sizes

Flanges with projecting flaying surfaces, groove / tongue, in porch / groove, oval and custom

 

  • EN 1514-2 (1997)
  • ASME/ ANSI B 16.5 for flanges, 150 to 2500 lbs – 1/2” to 24” acc.standard ASME B 16.20 (1993)
  • ASME B 16.47 serie A (MSS SP-44) for flanges, 150 to 900 lbs – 26” to 60” acc. standard ASME B 16.20 (1998)
  • ASME B 16.47 serie B (API 605) for flanges, 150 to 900 lbs – 26” to 60” acc. standard ASME B 16.20 (1998)
  • BS 1560 ASME/ ANSI B 16.5 for flanges, 150 to 2500 lbs – 1/2” to 24” acc. standard BS 3381

 

Flanges according to DIN - for of all types.

Non-standard according to specification ÖMV, MIDER,GOST, on request.

The thickness of the seals

t1ToleranceDb maxt2Recom-
mended thickness
after
mounting
 
[mm] [mm] [mm] [mm] [mm] [mm]
7,2 +0,35 100 – 3200 33 5 5,3 – 5,6
6,4 +0,30 100- 1600 30 4 4,7 - 4,9
4,8 +0,25 15 - 630 35 3 3,2 - 3,4
631 - 1600 30
1601 - 2000  
3,5 +0,25 15 - 1000 25 2 2,3 - 2,5
3,2 +0,25 20
2,5 +0,25 15 - 500 10 1,5 1,8 - 2,0

Symbols:

  • t1 - thickness of the sealing
  • t2 - thickness of the outer ring
  • D - inner diameter of the sealing element
  • b max - width of the sealing element

Notes:

  • all types of seals can be supplied with graphite impregnation
  • braided seals are available with core of the Sibral fiber or "E-glass" fiberglass 
  • rectangular cross-section to negotiate only with the manufacturer

 

Standard metallic materials

MaterialCSNDINDIN
AISI/ASTMB.S.Temperature [°C]
Spec.Spec.Material no.Min.Max.
Carbon steel 11 375 RSt. 37.2 CS 1.0038 238-C 40B -40 +500
Stainless steel 17 240 X5CrNi 18 1.4301 304 304S15/16/31 -250 +550
Stainless steel 17 247 X10CrNiTi 189 1.4541 321 321S12/49/87 -250 +550
Stainless steel 17 249 X2CrNi 189 1.4306 304L 304S11 -250 +550
Stainless steel 17 251 X15CrNiSi 2012 1.4828 309 309S24 -100 +1000
Stainless steel 17 346 X5CrNiMo 1810 1.4401 316 316S31/33 -100 +550
Stainless steel 17 348 X10CrNiMoTi 1810 1.4571 316Ti 320S31 -100 +550
Stainless steel 17 349 X2CrNiMo 1810 1.4404 316L 316S11/13 -100 +550

 

Standard filling

MaterialTemperature [°C]
pHApplicationColor
Min.Max.
Graphite -200 +500 0 - 14 Corrosive medium grey
PTFE -200 +250 0 - 14 Corrosive medium white
Ceramic -200 +1100  -  Very high temperature celadon
Mica -200 +1000  -  High temperature pink

 

Gasket compressive stress range Q

Material

Sided closed „Q” (N/mm2)

compressive stress +20°C

Both sides closed „Q” (N/mm2)

compressive stress +20°C

Min.Recom-
mended
Max.Min.Recom-
mended
Max.
Graphite 50 90  180 50 122 350
PTFE 50 80 130  50 110 200
Ceramic 60 90 150  70 120 300

 

Standard profiles / cross sections of seals

SPIRATEM 123 SPIRATEM 23

Spiral wound gasket consisting of the outside centre ring, the spiral part and the inner ring (for flat flanges).

   

The spiral wound gasket consists of the spiral part and the inner ring (for flanges of type recess/collar).

 Spiratem123     Spiratem23
     
 SPIRATEM 12  SPIRATEM 2
The spiral wound gasket consists of the spiral part and outside center ring (for flat flanges).   The spiral wound gasket consists of the filler and the V-shape metal strip wound together (for flanges of type recess/collar and groove and feather).
 Spiratem12    Spiratem2

 

The recommended flange surface finish

  • Ra= 3,2 to 12,5 (µm)

Notes:

  • Spiral seals are also available in the form of an oval and elliptical.
  • Is possible to make seal with a partition according to drawing.
  • All partitions are welded.
Camprofile gaskets

General characteristics

  • The gasket consists of a metallic core with a grooved profile and sealing layers.
  • The gasket can be used for pressures up to 25 MPa and temperatures up to 1000 °C
  • The gasket is applicable in a number of applications for all flange types (DIN, ASTM, EN, ČSN), it has a sturdy design ensuring uniform pressure distribution on the groove profile.
  • High reliability during temperature and pressure fluctuation.
The metallic core can be re-used
Camprofile gaskets

 

Standard gasket profiles

PARALLEL CONVEX
M18L M38L
Parallel core with fixed guide ring.   Convex core with fixed guide ring.
 M18L    M38L
 M20L  M40L
Parallel camprofile designed especially for flanges of type groove/feather and recess/collar.   Convex camprofile designed especially for flanges of type groove/feather and recess/collar.
 M20L     M40L
 M21LM  M41LM
Parallel camprofile with free (floating) guide ring.   Convex camprofile with free (floating) guide ring.
 
M21LM
 
M41LM

 

Standard materials for the core

 

CSNAISI/ASTMDINHardnessDensityTemperature
[°C]
Spec.Mater-
ial no.
HB[g/cm3]min.max.
11 373,
11 375
Carbon steel RSt. 37.2 CS 1.0038 100 – 130 7,85 -40 +500
17 247 321 X10CrNiTi 189 1.4541 130 – 190 7,90 -250 +550
17 249 304L X2CrNi 189 1.4306 130 – 190 7,90 -250 +550
17 251 309 X15CrNiSi 2012 1.4828 130 – 190 7,90 -100 +1000
17 348 316Ti X10CrNiMoTi 1810 1.4571 130 – 190 7,80 -100 +550
17 349 316L X2CrNiMo 1810 1.4404 130 – 190 7,90 -100 +550

 

Recommended thickness of the core:

  • 3mm, and for new systems 4mm

Recommended thickness of the sealing layer:

  • 2 x 0,5 mm, or 2 x 1,0 mm

Recommended flange surface finish:

  • Ra= 3,2 to 6,3 (µm)

 

Gasket compressive stress range Q

 
MaterialCompressive stress „Q” (N/mm2)  +20°C

Min.RecommendedMax
Graphite 20 90 400
PTFE 20 80 400
Ceramic 40 125 400
Gasket sheet 40 125 400
Double jacketed gaskets

General characteristics

  • Metal jacketed gaskets consist of a metallic jacket and a filler from a soft sealing material.
  • The filler material provides the gasket with compressibility and resilience, while the jacket ensures excellent compressive strength and sealing performance.
  • Jacketed gaskets can be produced in a variety of configurations making them ideal for heat exchanger applications.
  • A wide range of jacket and filler materials allows to produce gaskets for a great number of service conditions.
Double jacketed gaskets

 

Standard gasket profiles

 
S6 S12    
S6  S12 Standard profiles

 

Standard metallic materials

MaterialCSNAISI/
ASTM
DINHardnessDensityTemperature [°C]
Spec.Mater-
ial no.
HB[g/cm3]Min.Max.

CSt

11 375

238-C RSt. 37.2 CS 1.0038 100 – 130 7,85 -40 +500
SSt 17 247 321 X10CrNiTi 189 1.4541 130 – 190 7,9 -250 +550
SSt 17 249 304L X2CrNi 189 1.4306 130 – 190 7,9 -250 +550
SSt 17 251 309 X15CrNiSi 2012 1.4828 130 – 190 7,9 -100 +1000
SSt 17 348 316Ti X10CrNiMoTi 1810 1.4571 130 – 190 7,8 -100 +550
SSt 17 349 316L X2CrNiMo 1810 1.4404 130 – 190 7,9 -100 +550
MM400 - N04400 NiCu 30 Fe 2.4360 110 - 150 8,8 -125 +600
Copper - - - 2.0090 50 - 80 8,9 -250 +400
Recommended seal filling Thickness
Graphite -200   +550 from 250 to 3000 nm
Gasket sheets -100   +250 Rods welded (if needed)

Symbols:

  • CSt - carbon steel
  • SSt - stainless steel
  • MM40 - Monel metal 400

 

Ring type joints (RTJ)

General characteristics

  • Ring type joints (RTJ) are primarily used in the oil, gas, petrochemical and chemical industries for sealing of flange joints exposed to high temperatures (up to 1000 °C) and pressures (up to 1500 bar)
  • RTJs are offered in two basic shapes: oval (MB) or octagonal (M9), possibly in other shapes. 
  • A wide range of materials provides the metal gaskets with excellent sealing performance under various conditions.

Standard gasket profiles

 
M8-R ovalM12-RX
Standard RTJ design of the oval type for flanges with grooves. M8R-owalna

Special RTJ design for pressures up to 750 bars. The RTJs are interchangeable with the standard R models on condition that the bolt lengths must be extended.

 M12-RX
 M9-R octagonal  M11-BX 
Standard RTJ design of the octagonal type for flanges with grooves.   M9-R octagonal Special RTJ design for very high pressures up to 1500 bars. Designed for API flanges with grooving.  M11-BX

 

Recommended flange surface finish:

  • Profile R, RX: 1,6 (µm)
  • Profile BX: 0,8 (µm)

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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