ASME PTC 18
Hydraulic Turbines and Pump-Turbines
|Publication Date:||1 January 2002|
OBJECT AND SCOPE
This Code applies to all sizes and types of hydraulic turbines or pump-turbines. It defines methods for ascertaining performance by measuring flow rate (discharge), head, and power, from which efficiency may be determined. Requirements are included for pretest arrangements, types of instrumentation, methods of measurement, testing procedures, methods of calculation, and contents of test reports.
This Code contains mandatory test requirements and various methods of measurement. Where multiple methods of measurement and procedures are permitted by the Code, prior written agreement as to the selected methods and procedures is required.
The code on General Instructions, ACME PTC 1, governs the philosophy and general approach of ASME performance test codes.
The test procedures specified herein and the limitations placed on measurement methods and instrumentation are capable of providing a total uncertainty, calculated in accordance with the procedures of PTC 19.1 and of this Code, of not more than:
(a) Power ±1.2%
(b) Flow Rate ±1.5%
(c) Efficiency ±2.0%
Where favorable measurement conditions exist and best methods can be used, smaller uncertainties should result. Any test with uncertainties greater than the above shall not qualify as an ASME Code test.
This Code contains recommended procedures for index testing and describes the purposes for which index tests may be used.