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Description
Supagraf® Premier is one of James Walker's top-of-the-range fugitive emission control packings for valves.
It is a best available technology product for reducing industry's VOC fugitive emissions in line with the European Union's IPPC Directive.
This cost-effective, length-form packing is manufactured in exfoliated graphite, reinforced in a novel way to provide additional strength and resistance to pressure and extrusion. It incorporates an advanced lubricant system that prevents the pick-up of graphite on valve stems.
TA-Luft tests & golf balls
Tests in Germany to TA-Luft VDI 2440 emission control requirements show that gas leakage past a set of Supagraf® Premier valve packings would 
not even fill a golf ball in a year!
The tests were carried out by the Amtec laboratory for Ruhr Oel - a 50/50 joint venture of Deutsche BP and Petróleos de Venezuela - which owns the Schloven and Horst refineries at Gelsenkirchen, plus the Műnchsműnster petrochemicals plant.
The targets of the investigation were to confirm TA-Luft leakage rates less than 10-4 mbar.l/(s.m) at sealing system temperatures below 250°C, and less than 10-2 mbar.l/(s.m) at above 250°C, for a 56mm OD set of rings.
The test cycle involved 1000 vertical valve stem movements of 40mm - without live loading on the packing - whilst sealing helium at 25bar for 24 hours.
Leakage measurements after 24 hours at 240°C showed 7.0 x 10-6 mbar.l/(s.m). This is less gas than will fill a golf ball in a year at ambient pressure.
After 24 hours at 400°C the leakage rate was 2.3 x 10-5 mbar.l/(s.m). This is less gas than will fill a tennis ball in a year at ambient pressure.
These results also demonstrate that Supagraf® Premier very easily surpasses TA-Luft requirements for a 'High Grade Valve Packing'.
Typical applications for Supagraf® Premier
Supagraf® Premier is designed for harsh operating conditions where fugitive emissions from all types of valves need to be reduced to well below 100ppm. It is well proven and widely used in systems handling fluid media such as hydrocarbon liquid fuels and gases, lubricating oils and processing chemicals.
Specifications
Supagraf® Premier is third-party tested and certified to:
Prime features
Chemical properties
Chemically inert within the range pH 1-14, excluding strong oxidising agents. It has negligible volatile content.
Service capabilities - valve stem duties
Maximum operating temperature: +450°C in oxidising conditions.
Minimum operating temperature: -200°C.
Maximum system pressure: 250bar.
How supplied
Split preformed rings and sets for ease of installation and optimal performance, or boxed in 8m lengths for on-site maintenance economy. Ex-stock: all popular square sections from 3mm upwards to suit all standard valves. Non-standard square or rectangular sections made to order. Full fitting instructions are included.
Click here to download the Compression Packings guide pdf (2.17MB).
