James Walker & Co Ltd, Not enough gas to fill a golf ball

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Not enough gas to fill a golf ball
March 1st 2008

Supragraf Premier compression packing from James Walker has beaten TA-Luft VDI 2440 emission control requirements by a significant margin to gain an outstanding rating in independent tests carried out at the Amtec laboratory in Germany. Recorded gas emission levels in tests at 240 and 400°C would not fill a golf ball or tennis ball in a year.

Tests on a set of 56mm OD Supagraf Premier rings were undertaken for BP Refining & Petrochemicals, which operates the Ruhr Oel Gelsenkirchen refinery in Germany and needed to know the sealing efficiency of graphite valve packings.

The target was to confirm TALuft leakage rates of less than 10-4mbar.l/(s.m) at sealing system temperatures below 250°C, and less than 10-2mbar.l/(s.m) at above 250°C. Leakage measurements after 24h at 240°C showed 7.0 x 10- 6 mbar.l (s.m) and, at 400°C the rate was 2.3 x 10-5mbar.l(s.m).

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