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Fusion™ 936

Rapid Gas Decompression Resistant

SEALING SOLUTIONS

Greene, Tweed’s Fusion ™ 936 is a fluorocarbon elastomer specifically designed for Rapid Gas Decompression (also known as explosive decompression) resistance in downhole, surface and subsea oilfield equipment. RGD (rapid gas decompression) is a phenomenon that often occurs when high-pressure gas molecules migrate into an elastomer at a compressed state. When the pressure surrounding the elastomer is suddenly released, the compressed gas inside the elastomer tries to expand and exit the elastomer, thus causing RGD. Most elastomers experience severe blistering or cracking when the forces of these expanding gases overcome the strength of the surrounding material, but 936 provides superior RGD resistance.

Fusion ™ 936 also offers an expanded temperature range and chemical resistance not previously seen in RGD resistant fluoroelastomers. For example,Fusion ™ 936 exhibits better resistance to methanol, sour gas, hot water, steam and corrosion inhibitors than conventional fluorocarbon elastomers. In addition, its lower compression set delivers improved sealing and leak prevention unmatched by
competitive material.

FEATURES & BENEFITS

  • Provides reliable RGD resistance at low temperatures down to -35ºF (-37ºC) so parts maintain sealing properties and equipment life is extended
  • Offers reliable RGD resistance with compression set values that are much lower than existing material while preventing leakage and equipment failure
  • Extends the life of oilfield equipment exposed to unanticipated process upsets resulting in pressure drops
  • Reduces maintenance cost
  • Reduces mean time between repair

APPLICATIONS

  • Drilling tools
  • Completion equipment
  • Valves
  • Pumps
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AVAILABILITY

  • O-rings
  • G-T® rings
  • Custom-molded shapes
  • Vee rings

TYPICAL PROPERTIES

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TEST RESULTS

Because of the relationship of pressure and volume in near ideal gases, RGD damage is realized near the lower end of a decompression cycle. If the gases trapped in the elastomer are assumed to be ideal, the damage due to RGD is highly dependent on absolute pressures rather than the pressure change. (See below for sample of test results.)

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Test Details

Test A

  • Standard NACE TM0192-98.
  • Single cycle, 24-hour pressure soak with near instantaneous (3 seconds) pressure drop.
  • Seals are placed in a pressure vessel and are unrestrained with pressure on all sides.
  • Results: -214 O-rings: Internal 1,1 External 1,1 (2 samples).
  • Results: -325 O-rings: Internal 1,1 External 1,1 (2 samples).

Test B

  • Test based on Shell DODEP 02.01B.03.02 requirements.
  • -214 O-rings.
  • 3 cycles, consisting of a 48-hour hold at elevated pressure and temperature. Each decompression is at a rate no less than 1000 psi/min. Entire fixture is maintained @ ambient pressure for a minimum of 1 hour between cycles.
  • Seals are constrained as a face seal with no back-up ring. Nominal squeeze and gland fill are 17% and 77% respectively.
  • Fluid media is approximately 30% CO2 (by volume), balance N2.
  • Results: Internal: 1,1 External: 1,1* (2 samples tested).

Test C

  • Test Based on Shell DODEP 02.01B.03.02 requirements.
  • -214 O-rings.
  • 5 Cycles, consisting of a 48 hold at elevated pressure and temperature. Each decompression is at a rate no less than 1000 psi/min. Entire fixture is maintained @ ambient pressure for a minimum of 1 hour between cycles.
  • Seals are constrained as a face seal with no back-up ring. Nominal squeeze and gland fill are 17% and 77% respectively.
  • Fluid Media is Approximately 30% CO2 (by volume), balance N2.
  • Results: Internal: 1,2,2 External: 1,2,2* (3 samples tested).
Test D

  • Test based on Shell DODEP 02.01B.03.02 requirements.
  • -214 O-rings.
  • 5 cycles, consisting of a 48-hour hold at elevated pressure and temperature. Each decompression is at a rate no less than 1000 psi/min. Entire fixture is maintained @ ambient pressure for a minimum of 1 hour between cycles.
  • Seals are constrained as a face seal with no back-up ring. Nominal squeeze and gland fill are 17% and 77% respectively.
  • Fluid media is approximately 30% CO2 (by volume), balance CH4 (Methane).
  • Results: Internal: 1,1,1 External: 1,1,2* (3 samples tested).

Test E

  • Test based on Shell DODEP 02.01B.03.02 requirements.
  • -214 O-rings.
  • 5 cycles, consisting of a 48-hour hold at elevated pressure and temperature. Each decompression is at a rate between 1000 – 1200 psi/min. Entire fixture is maintained @ ambient pressure for a minimum of 1 hour between cycles.
  • Fluid media is approximately 5% CO2 (by volume), balance N2.
  • Results: Internal: 1,1,1 External: 1,1,1* (3 Samples tested).

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