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Gaskets & Sheet Jointings

Metaflex® - spiral wound gaskets

Medium_metaflex

Description
This gasket is certified for emission control applications.

James Walker Metaflex® gaskets will seal flanges where temperature, pressure, vibration or rates of flow are beyond the capability of conventional jointing materials.

They are wound in V-section metal strip and a softer filler material so that flange faces are presented with a spiral of alternate metal/filler layers.

Typical applications
Pipelines and pressure vessels on steam, petrochemical, nuclear, marine and hydraulic plant; also heat exchangers. Metaflex® Lolode gaskets are recommended for flange joints where bolt loading is limited.

Prime features

  • Gaskets are made in a wide variety of sizes and shapes.
  • Combinations of metal winding strip and filler are selected to suit the specific fluid media and operating conditions.
  • Quick to install and remove.
  • Operating temperatures from cryogenic up to 1000°C.
  • System pressures from high vacuum to over 35MPa/350bar.
  • Support rings - inside and/or outside of the spiral - make gaskets suitable for high line pressures on flat or raised flange faces.

Specifications

  • Metaflex® gaskets with graphite or PTFE fillers are certified as meeting TA-Luft emission control requirements.
  • Fire test: Metaflex® type SG/IR is certified to API 6FB. This gasket type has stainless steel inner support ring and windings, SPG graphite filler, and carbon steel outer guide ring. For other fire-test certified gaskets, see Metaflex® SG/Fire-Safe and  Corrusafe FS (Fire-Safe).   
  • Products are manufactured in accordance with all relevant gasket standards to suit flange designations: ASME B16.5, BS 1560 (only part 3.2 is still current), ASME B16.47 Series A (MSS-SP44), ASME B16.47 Series B (ASME B16.47 supersedes API 605), BS EN 1092 (supersedes BS 4504); plus DIN, JIS and NF.

Maximum operating temperatures of filler materials
SPG Standard purity graphite (oxiding media): 500°C.
SPG Standard purity graphite (inert/reducing media): 600°C.
SPG Standard purity graphite (steam): 650°C.
HPG High purity graphite (oxidising media): 500°C.
HPG High purity graphite (inert/reducing media): 600°C.
HPG High purity graphite (steam): 650°C.
Fluolion® PTFE: 260°C.
HTF High temperature filler: 1000°C.
Aluminium and lead fillers are also available.

Operating pressure
Metaflex gaskets seal up to 35MPa/350bar, although higher pressures can be considered. Please consult our Technical Support Team when considering higher pressures.

Metal winding strips

  • Standard materials: Stainless steels to BS EN 10088-2-1.4306 and BS EN 10088-2-1.4404 (formerly Grades 304L and 316L).
  • Other materials include a selection of alternative stainless steels, a wide range of nickel alloys, and titanium.

Support rings

  • Standard material: Carbon steel.
  • Other materials include a wide range of stainless steels and nickel alloys, and Fluolion® PTFE (inner rings only).

Metaflex® sizes

   Nominal
   thickness

   Compressed
   thickness
   Minimum
   diameter

   Maximum
   diameter

   2.5mm    1.9 - 2.1mm      10mm    300mm
   3.2mm    2.4 - 2.6mm    10mm    760mm
   4.5mm    3.2 - 3.45mm    10mm    1520mm
   7.3mm    4.7 - 4.9mm    60mm    3500mm
   Non-standard gaskets well in excess of 5000mm are manufactured.

How supplied
Almost any combination of component materials is available. Profiles include circular, obround, square, oval and diamond. Gaskets for non-standard flanges are made to order.