Extreme-duty seals minimise fugitive emissions
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Saint-Gobain Performance Plastics product story
Edited by the Engineeringtalk editorial team
Feb 3, 2006
One of the largest control valve manufacturers in Europe needed a seal solution capable of handling extremes of temperatures and pressures.
Saint-Gobain High Perferformance Seals was contacted by one of the largest control valve manufacturers in Europe to design a seal solution capable of handling extremes of temperatures and pressures, and simultaneously meet the leakage values specified in ISO15848-1 standard.
The valves are to be used in the Kashagan Field Development, Caspian Sea, Kazakhstan.
The Kashagan Field is one of the worlds largest hydrocarbon finds; estimates vary between 3rd to 5th largest ever, with over 38 billion barrels of oil in place.
The Kashagan Field is 80km offshore in a very harsh environment; the waters are shallow, 3 to 5m deep; in summer the average temperature is +40C, and the water is frozen solid from November through to March.
There are other serious environmental issues, these vast hydrocarbon deposits contain a very high percentage of hydrogen sulphide gas (H2S) - usually called sour gas.
A concentration of 2% sour gas in the well stream is high; the Kashagan Field has a concentration of 15% rising to 20%: this is extraordinary.
The contractor for this project has in put in place very stringent fugitive emission rates to reduce the amount of toxic H2S escaping into the atmosphere, and has decided to use the ISO15848 standard for fugitive emissions.
ISO15848 is still under development but will be approved early in 2006.
The valves operate from -93 to +121C at pressures up to 830bar; the required leakage rate for a 2in needle valve is just 1.2g per year.
Testing is completed with 97% helium and measurement is by helium mass spectrometer; seal lifetime is 20 years.
Saint-Gobain worked closely with the customer to provide a unique high performance OmniSeal sealing solution that handled the combined challenge of severe environmental and service conditions while meeting the stringent leakage rates of the specification.
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