SEALS FOR 12,500 PSIG AIR SYSTEMS
Abstract
The ability of Viton B O-ring of 90 Shore A hardness to seal 12,500 psig air pressure was evaluated under dynamic and static simulated-service conditions using solid Teflon back-up rings. Both dynamic and static seals showed small volume leakage after total elapsed times under pressure ranging from 35 to 58 hours. The O-rings showed no defects or evidence of extrusion after test. Leakage may have been due to slow recovery of the O-rings from compression, microscopic defects in the metal and/or rubber surfaces, or to the presence of small particles of compressed Molykote powder, the lubricant used on the O-rings. The rate of leakage was much less than previously reported for similar tests using spiral Teflon back up rings. The swelling of the O-rings caused by sudden release of pressure was low, for example: 1.2% after 1,000 psig pressure and 3.6% after 12,500 psig pressure. The measurements were made one hour after pressure release. The physical properties of Viton B Orings were not greatly affected by six months exposure to oxygen at 60 F and 1,750 pressure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 19, 1964
- Accession Number
- AD0430727
Entities
People
- A. E. Barrett