on the cutter bar, trapping the saw. Pinion The smaller of a pair of gear wheels. Pipe or tubing A tubular material made to dimensional specifications wherein a diameter is specified internally, externally or as a nominal diameter. Pipeline (petroleum) (a) Means: (i) Any pipeline that was authorised under the Petroleum Act 1937; or (ii) any pipeline or proposed pipeline likely to be permanent and used or intended to be used for the conveyance of any mineral, petroleum, geothermal fluid, natural gas, or any other fluid that, at ambient conditions, has inherent properties that may create a significant hazard; and (b) Includes any part of a pipeline or proposed pipeline, including (i) any directly associated fitting, pig launcher, or receiver; and (ii) any pressure vessel and its associated appurtenances, including any compressor, filter, separator, coalescer, or pulsation bottle; and (iii) any natural gas cooler associated with any pipeline compressor, pump, or tank; and (iv) any appurtenance required for the conveyance of the product or material in the pipeline or for its safe operation; but (c) Does not include (i) any bulk storage installation; or (ii) any pipeline wholly within the boundary of the plant that the pipeline is servicing; or (iii) any pipeline between a bulk storage installation and another form of transport that is not an extension of a pipeline as defined in these regulations; or (iv) any pipeline with a pressure of 2000 kP gauge or less under the control of a gas distributor and used to distribute