Live or not, Supagraf Premier is the route to IPPC
Valve operators and OEMs can now confidently use 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°C and 400°C 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 Deutschland: "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."
08 Aug 08
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