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Supagraf® H2

Supagraf H2 is a high performance, unique combination, valve stem packing set designed for hydrogen service.

TYPICAL APPLICATIONS
  • Fugitive emissions
  • Hydrogen
  • Valves

This packing solution incorporates Supagraf Premier, one of James Walker’s top-of-the-range fugitive emission control packings that has a long track record of exceptional performance in valves handling hydrocarbon liquid fuels and gases, lubricating oils or processing chemicals including hydrogen.

The performance of Supagraf Premier graphite packing rings are then enhanced by the use of precision machined carbon rings, inserted at the top and bottom of the stuffing box set and used as intermediary rings.

This product has been third party tested and is validated by James Walker for use in hydrogen service.

Supagraf H2 is designed specifically for the harsh operating conditions of all types of valves in hydrogen service where exceptional tightness, safety and extended dynamic sealing performance is required.

The product is also compatible with different blends of hydrogen and other liquid or gaseous media as well as hydrocarbons or chemicals.


Valve stem duties

  • Maximum operating temperature in oxidising conditions: +450°C (+842°F)
  • Minimum Operating Temperature: -253°C (-423°F)
  • Maximum System Pressure (Standard): 69 MPa/690 bar (10000 psi)

Contact us for advice where operating conditions are outside these limits.

Supagraf Premier is third-party tested and certified to:

ISO 15848-1 Class AH (fugitive emissions): Certified by ITIS BV at 69 MPa (static) with a five-ring set in a BSM valve. Emission level at 69 MPa/690 bar (10,000 psi) was ≤5ppmV

API 622: average emission level of 10.5ppmV, with a maximum of 37ppmV over five thermal cycles and 1510 mechanical cycles

TA Luft Rev 07.2002 requirements/VDI 2440

Shell specification SPE 77/312 Class A, Rev 16.10.2002

Shell specification SPE 77/312 Rev 06.2007: Class B rating with 47.4 MPa/474 bar (6875 psi) helium in Class 2500 valve

API 607 Edition 4 Fire Safety

Base graphite material complies to Shell MESC SPE 85/204.


The machined carbon ring, used as a bottom stuffing box ring, has been tested in combination with Supagraf Premier preformed rings in 4” class 300 globe valve with no bonnet extension according to

ISO15848-1 standard achieving Class BH tightness at CO1 endurance class temperature range from -196°C [-321°F] up to +400°C [752°F] (with no adjustment).


Compatible with media in the range of pH 0-14 excluding strong oxidising agents. The product has negligible volatile content.

As preformed graphite rings with a single split combined with precision machined carbon rings supplied endless or split in two matched halves with cut of 45 degrees. Product made to order

to suit application requirements.


Related Downloads

Supagraf H2

English pdf (350 KB) Download

Supagraf valve packing fitting guide

English pdf (779 KB) Download
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