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). More articles from James Walker SPS Ltd: | 
