SYMPOSIA PAPER Published: 26 July 2016

Stainless Steel Plug Valve Incident in High Pressure Oxygen: Delrin Seat and Silicone-Based Lubricant


A fire occurred in a stainless steel plug valve after completing a high pressure oxygen filling operation. The incident plug valve was being used to manually limit pressurization rates to downstream oxygen cylinders up to 20.7 MPa (3,000 psi). Fire developed within the plug valve when the filling operation was being completed (valve closing) and proceeded to burn out a downstream flexhose. Following the incident, it was determined that the plug valve had a Delrin® (acetal) seat and silicone-based lubrication. An insightful observation from the incident was that the relatively large Delrin® seat combined with the silicone-based lubrication did not kindle the stainless steel body or valve plug. This paper describes the incident and provides a summary of observations and discussion regarding this oxygen fire.

Author Information

Hooser, Jared, D.
WHA International, Inc., Las Cruces, NM, US
Forsyth, Bradley, S.
WHA International, Inc., Las Cruces, NM, US
Chiffoleau, Gwenael, J. A.
WHA International, Inc., Las Cruces, NM, US
Newton, Barry, E.
WHA International, Inc., Las Cruces, NM, US
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Developed by Committee: G04
Pages: 286–295
DOI: 10.1520/STP159620150074
ISBN-EB: 978-0-8031-7638-6
ISBN-13: 978-0-8031-7637-9