Gland packing passes emissions testing
A
James Walker and Co product story
Edited by the Engineeringtalk editorial team
Aug 14, 2008
Supagraf Premier gland packing can be used with both live-loaded and unloaded valve stem sealing systems to help meet IPPC environmental requirements.
Valve operators and manufacturers can now confidently use James Walker's Supagraf Premier gland packing with both live-loaded and unloaded valve stem sealing systems to help meet IPPC environmental requirements.
This follows TA-Luft certification by test laboratory Amtec for James Walker's world-leading valve packing in both modes of operation.
Four rings of Premier were tested unloaded at 300 and 400C packing temperatures to gain the TA-Luft high grade sealing rating.
The efficiency of the packing sets when live-loaded was confirmed by Amtec in response to requests from a chemical plant and an oil refinery in Germany that prefer to load their valve packings with spring washers.
The laboratory explained that, when using spring washers, the residual surface pressure on the rings is slightly higher.
As a result, the sealing efficiency will be improved fractionally.
Commented Claus-Peter Franzenburg, Managing Director of James Walker Germany: "Supagraf Premier does not need live-loading under normal operating conditions".
"Live loading is an option for use when valves are subjected to significant thermal cycling, or are sited where maintenance access is particularly difficult".
Supagraf Premier has already beaten TA-Luft VDI 2440 emission control requirements by outstanding factors in independent tests carried out by Amtec in Germany.
Recorded gas emission levels in the two tests at 240 and 400C, respectively would not fill a golf ball or tennis ball in a year.
This valve packing has a long 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 users, and third-party verified for emission control by CETIM to Shell SPE 77/321 Class A specification.
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