ASME PTC-18-2002 pdf free download.HYDRAULIC TURBINES AND PUMP-TURBINES.
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 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, ASME 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 FTC 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.
The code on Definitions and Values, ASME PTC 2, and referenced portions of Supplements on Instruments and Apparatus, ASME PTC 19 Series, shall be considered as part of this Code. Their provisions shall apply unless otherwise specified. Common terms, definitions, symbols and units used throughout this Code are listed in this section. Specialized terms are explained where they appear. The following definitions apply to this Code:
(a) Machine means any type of hydraulic turbine or pump-turbine.
(b) Turbine means a machine operating in the turbine mode.
(c) Pump means a machine operating in the pumping mode.
(d) Pump-turbine is a machine that is capable of operating as a pump and as a turbine.
(e) Runner means turbine runner or pump impeller.
(f) Run comprises the readings and/or recordings sufficient to calculate performance at one operating condition.
(g) Point is established by one or more consecutive runs at the same operating conditions and unchanged wicket gate, blade or valve openings.
(h) Test comprises a series of points and results adequate to establish the performance over the specified range of operating conditions.
(i) Parties to the Test for acceptance tests, are those individuals designated in writing by the purchaser and machine suppliers to make the decisions required in this Code. Other agents, advisors, engineers, etc. hired by the Parties to the Test to act on their behalf or otherwise, are not considered, by this Code, to be Parties to the Test.
2.2
Clarification of any term, definition or unit of measurement in question shall be agreed to in writing by the Parties to the Test before the test.