Reduced bore valves are commonly used for intra-unit applications. Many exceptions exist such as piggable lines, low pressure compressor suction piping, offshore bridgesThis is really about ethics. In earlier times, when standards Butterfly Valveswere not that detailed, simple contracts involving handcraft parts often had the wording 'general work to be done based on solid handcraft practise'. This interpretedGlobe Valves and understood as the solid, normal, knowledgeable way 'masters' in the handcraft did the work and that 'everybody' recognized and knew. Drawing the modern parallell: for aSafety valves pipeline in this length and dimension as described here, the discription 'ball valves' (from either end user or bidder) will imply full bore. Deviation from this with reduced bore, even if the reduced bore valves are top quality, is a standard below normal, and not the Plug Valvesnormal handcraft practise'. Another point: if the description in Reducing Valvesitself for the pipeline and valves from the end-user or yourself at this stage is uncomplete and giving doubt about allowable dimensions: Propose to rework and put some solid pipeline engineering QA into the process to see if pipeline dimension and valves with the pipeline could be reduced one dimension and/or are laid out and described correct for the process.

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