Abstract: Disclosed herein is a rotational roller apparatus for use with a pipeline unit. The pipeline unit is received in a pipeline for welding and/or inspection. The rotational roller is attached to and is able to support at least a portion of the weight of the pipeline unit. The rotational roller unit also includes an extension member and a reduced friction base. The reduced friction base is attached to an end of the extension member so that the rotational roller has a retracted and an extended configuration. In the extended configuration, the reduced friction base contacts an interior of the pipeline and supports at least a portion of the weight of the pipeline unit and thereby allows the unit to be rotated about a longitudinal axis within the pipeline.

Abstract: Disclosed herein is a rotational roller apparatus for use with a pipeline unit. The pipeline unit is received in a pipeline for welding and/or inspection. The rotational roller is attached to and is able to support at least a portion of the weight of the pipeline unit. The rotational roller unit also includes an extension member and a reduced friction base. The reduced friction base is attached to an end of the extension member so that the rotational roller has a retracted and an extended configuration. In the extended configuration, the reduced friction base contacts an interior of the pipeline and supports at least a portion of the weight of the pipeline unit and thereby allows the unit to be rotated about a longitudinal axis within the pipeline.

Abstract: A method of determining the effectiveness of a sterilization cycle in a sterilization chamber by the use of an indicator containing DNA and a dye which can be bound thereto. The indicator containing DNA is placed in the sterilization chamber prior to the beginning of the sterilization cycle. When the DNA is subjected to heat and steam, the molecule is fragmented so that it is no longer capable of binding the dye. The DNA is withdrawn from the indicator after the sterilization cycle, contacted by a solution of the dye and, thereafter, dipped into wash water. If sufficient fragmentation has taken place, a substantial percentage of the dye will be washed off during the second dip. This is easily recognized by the operator and the efficacy of the cycle can be determined. On the other hand, if insufficient heat and steam has been applied, the remaining DNA will retain the dye and little or no change in color will be observed.