Rapid Gas Decompression O-Rings
We Have What It Takes To Handle The Pressure!
Rapid Gas Decompression (RGD) is also commonly referred to as Explosive Decompression (ED) and is found in many high pressure processes often found in the Energy, Oil & Gas (EOG) industry. It occurs when a pressurized gas is released very quickly and can cause the rubber seals inside the piece of equipment to fail. This seal damage is not always visible because small bubbles form on the inside of the rubber seal, which can lead to seal failure.
Certain o-ring compounds have been specifically formulated to resist this type of failure and withstand rapid gas decompression. These types of o-rings are commonly referred to as RGD, ED Resistant, or AED (anti-explosive decompression) o-rings. The most commonly used material for RGD certified o-rings is Viton® or FKM. However, RGD o-rings can also be made from HNBR, Aflas, and FFKM materials.
Global O-Ring and Seal stocks two FKM Rapid Gas Decompression O-Rings (Parker V1238 & V90RGD) but we have access to a number of additional compounds by request.
Parker V1238 O-Rings
One of the more widely accepted RGD o-ring compounds is the Parker V1238-95. V1238-95 is a 95 Shore A durometer fluorocarbon developed to mitigate the detrimental effects of explosive decompression (ED) and extrusion typically found in the EOG market. This fluorocarbon material has a unique combination of superior physical and chemical properties, as well as excellent compression set resistance. With these superior internal properties, V1238-95 has passed some of the most stringent test requirements found in the EOG market. This includes passing NORSOK M-710 and API 6A requirements.
Global O-Ring's V90RGD O-Rings
The Global Compound #V90RGD is a type of FKM 90 Shore A durometer compound with a dynamic service temperature range of 5°F to 428°F (-15°C to 220°C) and excellent resistance to synthetic and mineral lubricants. The NORSOK M-710 test yielded a perfect 0000 score for this compound. This means that o-rings made from this material were tested in an RGD environment and cut into 4 pieces, none of the pieces showed any signs of cracking or blistering.
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Rapid Decompression Standards and Testing
NORSOK, an organization who develops standards for the Norwegian Petroleum Industry, has developed an extensive and universally accepted test for ED resistance of o-rings. The NORSOK standard M-CR-710 (Section 8.3, Annex B) outlines the requirements for ED resistance testing of o-rings and other related seals. The o-ring is exposed to RGD conditions and then subsequently cut into four pieces to expose the inner cross sections since most damage occurs from the inside out in RGD applications. Any internal cracks that are found are rated according to the chart below:
|0||No internal cracks, holes or blisters of any size.|
|1||Less than 4 internal cracks, each shorter than 50% of the cross section, with a total crack length less than the cross section.|
|2||Less than 6 internal cracks, each shorter than 50% of the cross section, with a total crack length of less than 2.5 times the cross section.|
|3||Less than 9 internal cracks of which max. 2 cracks can have a length between 50% and 80% of the cross section.|
|4*||More than 8 internal cracks or one or more cracks longer than 80% of the cross section.|
|5*||Crack(s) going through the cross section or complete separation of the seal into fragments.|