Gaskets and Sheet Jointings

Metaflex spiral wound gaskets

This high temperature 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. Graphite filled Metaflex are designed to Shell MESC SPE 85/103 (Sept 2012), SPE 85/203 (Sept 2012) and SPE 85/300 (Sept 2012).


Shell TAT approved

Specifically designed from the outset to meet the industry’s most stringent requirements, graphite fill Metaflex is TAT approved to the requirements of both Shell MESC SPE 85/300 3.3.2 Class B (H) for fugitive emissions and Shell MESC SPE 85/300 3.3.5 requirements under the Hot Operational Tightness Test (HOTT).


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 35 MPa/350 bar.
  • 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.

Metaflex sizes

   Nominal thickness    Compressed thickness    Minimum diameter    Maximum diameter
   2.5 mm    1.9 - 2.1 mm      10 mm    300 mm
   3.2 mm    2.4 - 2.6 mm    10 mm    760 mm
   4.5 mm    3.2 - 3.45 mm    10 mm    1520 mm
   7.3 mm    4.7 - 4.9 mm    60 mm    3500 mm


Non-standard gaskets well in excess of 5000 mm can be manufactured.


Maximum operating temperatures of filler materials

  • Graphite (oxidising media): 500°C.
  • Graphite (inert/reducing media): 600°C.
  • Graphite (steam): 650°C.
  • Fluolion PTFE: 260°C.
  • HTF High temperature filler: 1000°C.
  • Aluminium fillers are also available.

Operating pressure

Metaflex gaskets seal up to 35 MPa/350 bar, 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).

How it is supplied

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


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