Busak+Shamban, part of the Trelleborg group, have been a leading supplier of sealing solutions to the oil and gas industry for over twenty-five years. To support their customers supplying the
Norwegian oil and gas industry in gaining NORSOK approval for their assemblies, Busak+Shamban have had a number of sealing materials tested to NORSOK standards. They can now offer the largest range
of sealing materials with certificates of compliance to NORSOK M-710, available from any seal developer and manufacturer.
NORSOK standards cover all aspects of working practice, equipment and materials used within the Norwegian oil & gas industry. They are recognized throughout the industry, worldwide. One of the
main differences from previous approvals is that all individual components within an assembly must meet and be approved to NORSOK standards, rather than just the complete assembly.
Different grades of Busak+Shamban polymers were involved in rigorous independent tests, undertaken and supervised by MERL Materials Engineering Research Laboratory, a respected independent
laboratory in the United Kingdom. The main focus of the testing was to predict service life of the materials within an offshore working environment, as specified in NORSOK M-710 standard, Annex C.
Ideally materials should exceed expected well production lifetime of an oil and gas facility of 30 years.
Thermoplastic sealing compounds, PTFE based grades and PEEK based materials, were immersed in a sour (2% H2S) multi-phase fluid at 200-220°C (392-428°F), for periods of 7-70 days. After saturation in this liquid the mechanical properties were measured and used to predict ageing and estimated service life of the materials.
The thermoplastic materials tested met NORSOK acceptance criteria, showing them to have good chemical stability. Changes in tensile strength remained well within the NORSOK acceptance range for thermoplastics and all easily exceeded the 30 year expected well production lifetime. Eleven Busak+Shamban materials have now been certified by MERL as complying to NORSOK standard, more than any other seal developer and manufacturer.
Testing measured tensile strength, elongation, Young’s modulus and volume changes, with detailed analysis supported the laboratories findings. The sealing materials are available in a range of seal types. The PTFE based and PEEK based materials are commonly used in the industry in the form of Turcon® Variseal®, back up rings and support rings.