High-temperature elastomers aid oil and gas seals
A
Precision Polymer Engineering product story
Edited by the Engineeringtalk editorial team
Mar 6, 2003
Precision Polymer Engineering has developed four new Aflas elastomers for high temperature sealing applications in the extreme environments encountered in oil and gas production and processing.
Precision Polymer Engineering has developed four new Aflas elastomers for high temperature sealing applications in the extreme environments encountered in oil and gas production and processing.
The new elastomers increase Aflas seal temperature resistance from 260C to a peak of 290C, while still retaining the excellent steam and chemical/sour gas resistance that are characteristic of Aflas.
Until now the high level of chemical resistance of Aflas has been at the price of poor physical properties, Precision Polymer Engineering's Aflas seals offer improved explosive decompression and extrusion resistance and mechanical flexibility.
During recent trials the Aflas A95H explosive decompression grade withstood a two second pressure drop from 750lb/in2 to normal atmospheric pressure.
The new Aflas grades offer 27% increased flex life, typical of NBR elastomers.
Moreover, when subjected to long-term heat ageing at 175C, the improved Aflas material retains at least 30% higher tensile strength and elongation than standard Aflas grades.
In addition, the elastomers can also be combined with other materials to broaden the scope of Aflas applications.
These can include metal substrates or reinforcing fabrics for high-pressure applications.
Used as a composite seal, Aflas offers a cost-effective and longer lasting alternative to other more expensive elastomers.
"The new Aflas grades open up a range of new applications for engineers where previously they may have had to compromise on seal performance and, as a consequence, faced increased plant downtime as seals are replaced.
We are already looking at the opportunity of replacing HNBR seals in drill heads with Aflas to extend drilling times between routine seal maintenance", comments Peter Cloney, Managing Director, Precision Polymer Engineering.
The four Aflas grades are A95H (explosive decompression), A85H, A75H and A70H.
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