It means the .5 or .75 x 0-4 nips are not allowed on re-vamp of existing systems under seismic rules. **************************************************************************** What confuses me is why does the following paragraph exist if 1" pipe is the minimum size for hydraulic systems: 8.15.19.4.5 The use of pipe nipples less than 1 in. (25 mm) in diameter shall not be permitted where seismic design is required on the system.
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