ASME PTC-18:2002 pdf free download – HYDRAULIC TURBINES AND PUMP-TURBINES
1.1 Object
This Code defines procedures for field performance and acceptance testing of hydraulic turbines and pump- turbines operating with water in either the turbine or pump mode.
1.2 Scope
This Code applies to all sizes and types of hydraulic turbines or pump-turbines. It defines methods for ascer- taining performance by measuring flow rate (discharge), head, and power, from which efficiency may be deter- mined. Requirements are included for pretest arrange- ments, types of instrumentation, methods of measurement, testing procedures, methods of calcula- tion, and contents of test reports. This Code contains mandatory test requirements and various methods ofmeasurement. Wheremultiple meth- ods of measurement and procedures are permitted by 1 the Code, prior written agreement as to the selected methods and procedures is required. The code on General Instructions, ASME PTC 1, gov- erns the philosophy and general approach of ASME performance test codes.
The test procedures specified herein and the limita- tions placed on measurementmethods and instrumenta- tion 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. Anytestwith uncertainties greater thanthe above shall not qualify as an ASME Code test. This Code contains recommended procedures for indextestingand describesthe purposes forwhichindex tests may be used.
2.3 TheInternational SystemofUnits (SI) is usedthrough- out this Code with U.S. Customary Units shown in parentheses (see Table 2.3). The code on Definitions and Values, ASME PTC 2, provides conversion factors for use with ASME performance tests.
2.4 The symbols, terms, definitions and units in this Code are listed in Table 2.4A. See Figs. 2.4A through 2.4E for a graphical definition of certain terms.
2.5 By agreement between the Parties to the Test, the runner reference elevation Z c for determining the plant cavitation factor may be selected at the location where the development of cavitation has a predominant influ- ence on the performance of the machine. In the absence of such agreement, the reference elevation Z c shall be as shown in Fig. 2.5.
2.6 Some definitions in this Code may differ from those customarily associated with centrifugal pumps.