Flow nozzles are available in three basic designs:
- ISA 1932 nozzle
- Long radius nozzle
- ASME throat tap nozzle
Each design is slightly different and is covered by ISO5167:2003, with the exception of the ASME throat tap nozzle. The ASME nozzle can also be supplied in a pipe section to meet the requirements of ASME Performance Test Code 6 (PTC-6) for steam turbine testing.