STP1111: Automation of Autogenous Ignition Equipment

    Lowrie, R
    Consulting Engineer, Software Engineer, and Technician, The BOC Group Technical Center, Murray Hill, N.J.

    Garcia, H
    Consulting Engineer, Software Engineer, and Technician, The BOC Group Technical Center, Murray Hill, N.J.

    Henningson, RL
    Consulting Engineer, Software Engineer, and Technician, The BOC Group Technical Center, Murray Hill, N.J.

    Pages: 12    Published: Jan 1991


    Abstract

    Automation of the AIT equipment for G72 has reduced the operator attendance time during a test from up to two hours to 15 minutes. The testing is controlled by an IBM XT computer operating through an A/D converter board that receives signals from sensors and sends signals to operate valves and switches. The system components were upgraded in oxygen compatibility and pressure rating to allow oxygen pressures to 34.5 MPa (5000 psig).

    After sample installation and a leak check, the computer controls the heating rate and records pressure and temperature. Sample ignition is detected as a temperature rise of more than 2°C/s for 5 s. One minute after this is detected, the heater is switched off, and combustion products are purged from the reaction vessel. The test is ended if no reaction is detected when 425°C (800°F) is reached.

    The test data are recorded on a hard disk and can be viewed at any later time. Data obtained on several standard materials are very reproducible. Their standard deviations are all less than 2°C.

    Keywords:

    oxygen, autoignition, spontaneous ignition, flammability, oxygen compatibility, test, safety, Nylon 66, Fluorel, Neoprene, Vespel SP21


    Paper ID: STP17758S

    Committee/Subcommittee: G04.01

    DOI: 10.1520/STP17758S


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