This appraisal is for Derwent resilient seated PN 16 hydrant and air valve isolators and NZ underground screw-down fire hydrants manufactured in compliance with the material and performance requirements of NZS 4522:2010 Underground fire hydrants.
The two product configurations included in the scope of this Appraisal are:
- Hydrant and air valve isolators with a studded outlet suitable for attaching AS/NZS 4087 Fig B5 DN 100 flanged fittings including spring hydrants, air valves or threaded outlets. The flanged inlet is slotted to accommodate attachment to either AS/NZS 4087 Figure B5 DN 80 or DN 100 flanges.
- NZ underground fire hydrants in squat and tall versions. The outlet is a 2 TPI threaded outlet and the flanged inlet incorporates slotted holes to accommodate both AS/NZS 4087 Figure B5 DN 80 (146 PCD) and AS 2129 Table D DN 90 (165 PCD), as specified in NZS 4522.
The NZ underground fire hydrants are intended exclusively for the New Zealand market.