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    The NOL Ring Test as a Method for Selecting Finished Glass Fibers for Reinforcement of Epoxy Pipe

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    Experimental work was conducted to determine whether a relationship exists between the NOL ring shear test and the life of glass-reinforced epoxy pipe when submitted to cyclic water pressure. Several lots of glass fibers were prepared in the laboratory by heat cleaning and finishing with a silane coupling agent. Two-inch diameter pipe was prepared from these fibers by a wet winding operation. The pipe was tested to weeping failure by exposing it to internal water pressure, cycling between 45 and 1150 psi. Representative spools were randomly selected from the glass lots and wound into 6-in. out-side diameter ring specimens. These were tested in shear after various periods of immersion in 190 F water.

    A plot of ring “shear” stress after one week's immersion versus log cycles to failure of the pipe specimens was made. The best straight line was fitted to the data by a least squares method and the linear regression line was plotted and analyzed on an IBM 705 computer. It was found that the ring shear data did correlate with the cyclic life of pipe. The life of the pipe increased with increasing ring shear values.

    Author Information:

    Roskos, T. G.
    A. O. Smith Corp., Milwaukee, Wis.

    Pflederer, F. R.
    A. O. Smith Corp., Milwaukee, Wis.

    Committee/Subcommittee: D20.23

    DOI: 10.1520/STP44426S