Spiral Wound Gaskets

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Spiral Wound Gaskets

Description

IDT-spiral wound gaskets consist of a spiral shaped wound combination of a non-metallic tape made from graphite, PTFE or mica and a profiled stainless steel or steel tape. The gasket spiral is fitted with a supporting ring on the inner diameter and/or a centring ring on the outer diameter depending on the application area. Spiral wound gaskets can be distinguished as follows in their design depending on the flange surface:

  • Flange with raised face:
    Use of spiral wound gaskets with inner- and centring ring
  • Male and female flanges:
    Use of spiral wound gaskets with inner ring
  • Flanges with tongue/groove:
    Use of spiral wound gaskets without inner- and centring ring

Spiral wound gaskets for flanges following DIN EN 1092 are described and manufactured following DIN EN 1514-2 with regards to design and dimensions; deviating from this, the dimensions for tongue/groove applications are specified in DIN EN 1514-1, form TG. For flange connections following ASME B16.5, the ASME B16.20 as well as DIN EN 12560-2 are the norma tive basis for design and dimensional specifications for spiral wound gaskets.

Spiral wound gaskets are used specifically in high pressure applications and in critical operating conditions due to their specific characteristics profile. The gaskets are well-suited for alternating loads with accompanying component expansion differences in addition to the high temperature limit [450 °C for graphite, higher temperatures possible depending on the design] and the pressure operating limit [320 bar]. Spiral wound gaskets balance these differences well while also exhibiting low leakage rates.

Spiral wound gaskets comply with TA Luft 2002 [VDI 2440/2200] and the proof for VDI 2290 can also be supplied. The targeted selection of material components and variation of the set-up allows the gasket system to adjust to the requirements of many different media and operating conditions. The SD11 “Minimum Stress” [MS] version, which is optimised with regards to design and construction should be used for flanges as per ASME B16.5 [e.g. Class 150 lbs.] or for flange connections which are not suitable for a standard spiral wound gasket following ASME B16.20 because of bolt forces.

Properties

  • Managing alternating load for e.g. start-up and shut-down procedures
  • Temperature resistance depending on the non-metallic material and metal materials
  • Constant temperature range for PTFE:-200 °C to approx.250°C
  • Constant temperature range for graphite:-200°C to approx.450 °C,higher temperatures are possible depending on the design
  • Media resistance depending on the non-metallic material and metal material
  • Very high pressure operating limit of up to 320 bar
  • Complies with TA Luft 2002 [VDI 2440/2200] leakage requirements
  • Complies with VDI 2290 [with calculatory leakage certificate following DIN EN 1591-1]
  • Fire Safe Test [Graphite]
  • Blow-out resistance [graphite]
  • BAM-test report for liquid and gaseous oxygen [graphite]
  • BAM-test report for ethylene and propylene oxide [graphite]
  • FDA-conform [PTFE]
  • No ageing and embrittlement even at high temperatures
  • Labeling for design with centering ring

Applications

  • Established sealing system for the chemical and petro-chemical sector,in conventional power and nuclear power stations, for steam generation and in device construction,especially wherever high temperatures and pressures have to be managed safely
  • Used in pipeline flanges, device and container flanges, pumps and valves
  • Can be used for very high operating pressures and/or temperatures
  • Flange roughness of Rz<=80 „µm“ is recommended
  • Can be supplied with graphite or PTFE as non-metallic material,for higher temperatures >= 550°C with insert of mica or spiral made from 1.4828

Product Range

  • Dimensions and set-up following DIN EN 1514-2,DIN EN 12560-2 and ASME B16.20, flange according to ASME B16.47 series A and B;
  • Wound spiral with filler for tongue/groove flanges
  • Wound spiral with filler with inner- and centering ring for raised face flanges
  • Wound spiral with filler and centering ring
  • Wound spiral with filler and inner ring

Marking

  • Manufacturer
  • Nominal width
  • Nominal pressure stage
  • Material of the inner ring, spiral, filler material and centering ring
  • Colour coding following DIN EN 1514-2 or ASME B16.20

Materials

  • The material identification of the spiral and the inner ring is done by colour coding the centring ring.
Material Colours
1.4301[304] yellow
1.4404[316L] dark green
1.4571[316Ti] light green
1.4541[321] turquoise
1.0033 silver
2.4360[Monel 400] orange
2.4816[Inconel 600] gold
3.7025[Titan] purple
Hastelloy C beige

Seal Area [NON-METALLIC MATERIAL]

Material Colours
Graphite foil[e.g. WS 3800,WS 3803,WS 3805] Grey
PTFE unsintered[WS 7739] White
PTFE unsintered [WS 7010] White

Centring Ring

  • Carbon steel [corrosion protected] or corresponding stainless steel material

Sealmax has now tied up with KWO and IDT Germany for marketing their product range in India

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