Process Plant and I'm checking the selection of valves. When I came to ball valves 600# our specification says to be "Reduced Bore" but our three vendors (all very well known and respected) had offered "Full Bore". Is this standard for 600#? Reduced bore is often cheaper to produce. Often used by producers and vendors to offer a cheaper solution, especially for smaller sizes, but can be found for all. Depending on pressure class, exact type and construction this is more a question on what is available, cheapest and best adapted to the technical conditions and total requirement. Ask the suppliers for additional information, and why they offer this solution. Depending on the project status you could either check if 'reduced bore' is a technical requirement (probably not) - or you could recheck the whole piping system and see if the piping and valve sizing is optimized or could be reduced down to next dieameter. Such specs are often 'leftovers' from previous projects, and need to be revised from time to time according to commercial availability of products and what is happening in the real world.

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