Product category:
Seals
News Release from: James Walker and Co | Subject: Supagraf Premier
Edited by the Engineeringtalk Editorial
Team on 21 February 2008
Packing passes emissions tests with ease
Supagraf Premier compression packing has beaten TA-Luft VDI 2440 emission control requirements by a significant margin.
Supagraf Premier, James Walker's world-leading compression packing, 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 400C, respectively, would not fill a golf ball or tennis ball in a year
This article was originally published on Engineeringtalk on 14 Nov 2003 at 8.00am (UK)
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The tests on a set of 56mm OD Supagraf Premier rings were undertaken for Ruhr Oel - a 50/50 joint venture of Deutsche BP and Petroleos de Venezuela - which owns the Schloven and Horst refineries at Gelsenkirchen, plus the Munchsmunster petrochemical plant.
It needed to know the sealing efficiency of graphite valve packings from several suppliers in order to comply with the European Union's IPPC pollution prevention and control directive.
Targets of the investigation were to confirm TA-Luft leakage rates less than 10e-4mbar.litre/(sm) at sealing system temperatures below 250C, and less than 10e-2mbar.litre/(sm) above 250C.
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The test cycle involved 1000 vertical valve stem movements of 40mm - without live-loading on the packing - while sealing helium at 25bar for 24 hours.
Leakage measurements after 24 hours at 240C showed 7.0 x 10e-6mbar.litre/(sm).
"You can visualise this as less gas than will fill a golf ball in a year, measured at ambient pressure", explains James Walker Business Development Manager Brian Milford.
"It also demonstrates that Supagraf Premier very easily surpasses TA-Luft requirements for a high grade valve packing".
After 24 hours at 400C, the leakage rate was 2.3 x 10e-5mbar.litre/(sm).
Says Milford: "This rate is exceptionally better than TA-Luft requirements for duties above 250C.
A year of emissions at this level would not even fill a tennis ball".
Supagraf Premier has a 10 year record of beating fugitive emission control specifications.
In 1997 it was subjected to over 12,000 valve operating cycles with methane at 40bar and kept emission levels below 500ppm.
In 1999, it came top of its class in comparative tests run by the Materials Technology Centre of Akzo Nobel.
Leakage rates were between six and 100 times less than competitor's brands - and it lasted 12 times longer than the next best valve packing.
Since then it has twice been certified to TA-Luft requirements - by different customers - and third-party verified for emission control by CETIM to Shell SPE 77/321 Class A specification. Request a free brochure from James Walker and Co ...
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