May 2000 MAPTIS Presentation 1

SME initiative

Frictional Heating ED36-OWI-035/OCP-800-092 Operating Procedures

• These tests determine the ignition characteristics caused by frictional heating in pumps, compressors, and various other oxygen components

• The end of a hollow cylinder is rotated against a stationary cylinder on a common axis

May 2000 MAPTIS Presentation 2

SME initiative

Frictional Heating ASTM-STP-910 Flammability and Sensitivity of Materials

in Oxygen Enriched Atmospheres

• Typical Specimen– Hollow cylinders 2.5 cm OD and 2.0 cm ID

• Ignition Source– Frictional heating

• Test Conditions– Max rotation is 30,000 RPM– Max load is 5000 N – Worst-case pressure, temp, and oxygen

concentration• Ranking Criteria

– The resistance of metals to ignition is measured as the product of the contact pressure and the average linear velocity or Pv product required for ignition