NBN EN 60041 : 1995

SECTION ONE - GENERAL RULES
1. Scope and object
1.1 Scope
1.2 Object
1.3 Types of machines
1.4 Reference to IEC and ISO standards
1.5 Excluded topics
2. Terms, definitions, symbols and units
2.1 General
2.2 Units
2.3 List of terms, definitions, symbols and units
3. Nature and extent of hydraulic performance guarantees
3.1 General
3.2 Main guarantees
3.3 Other guarantees
4. Organisation of test
4.1 Adequate provision for the test
4.2 Authority for test
4.3 Personnel
4.4 Preparation for test
4.5 Agreement on test procedure
4.6 Instruments
4.7 Observations
4.8 Inspection after test
4.9 Final report
SECTION TWO - EXECUTION OF TEST FOR THE DETERMINATION OF
THE STEADY STATE PERFORMANCE OF THE MACHINE
5. Test conditions and procedure
5.1 General test procedure
5.2 Test conditions to be fulfilled
6. Computation and analysis of results
6.1 Computation of test results
6.2 Uncertainties in measurements and presentation of
      results
6.3 Comparison with guarantees
SECTION THREE - EXECUTION OF TEST FOR THE DETERMINATION
OF THE TRANSIENT CHARACTERISTIC OF THE MACHINE
7. Test conditions and procedure
7.1 Test conditions
7.2 Test procedure and instrumentation
8. Computation and analysis of results
8.1 Conversion of results
8.2 Comparison with guarantees
SECTION FOUR - METHODS OF MEASUREMENT
9. Introduction
9.1 Efficiency
9.2 Hydraulic power
9.3 Mechanical power
10. Discharge
10.1 General
10.2 Current-meter method
10.3 Pitot tubes
10.4 Pressure-time method
10.5 Tracer methods
10.6 Weirs
10.7 Standardized differential pressure devices
10.8 Volumetric gauging method
11. Specific hydraulic energy of the machine
11.1 General
11.2 Determination of the specific hydraulic energy
11.3 Determination of the net positive specific energy
11.4 Pressure measurements
11.5 Free water level measurements
11.6 Uncertainty of measurements
12. Power
12.1 Indirect method of power measurement
12.2 Direct method of power measurement
12.3 Bearing losses
13. Rotational speed
13.1 General
13.2 Speed measurements in the case of direct measurement
      of power
13.3 Speed measurements in the case of indirect
      measurement of power
13.4 Uncertainty of measurement
14. Thermodynamic method for measuring efficiency
14.1 General
14.2 Efficiency and specific mechanical energy
14.3 Procedure for measurement of specific mechanical
      energy
14.4 Apparatus
14.5 Test conditions to be fulfilled
14.6 Corrective terms
14.7 Uncertainty of measurement
15. Index tests
15.1 General
15.2 Relative discharge measurement
15.3 Measurement of other quantities
15.4 Computation of results
15.5 Uncertainty of measurement
Appendix A - Systematic uncertainties in performance
             measurements at steady state conditions
Appendix B - Rejection of outliers
Appendix C - Analysis of the random uncertainties for a
             test at constant operating conditions
Appendix D - Analysis of the random uncertainties for a
             test over a range of operating conditions
Appendix E - Physical data
Appendix F - Derivation of the equation for the specific
             hydraulic energy of a machine
Appendix G - Measurement of electric power - Determination
             of the correction for a single-phase measuring
             system
Appendix H - Thermodynamic method - Examples for a balance
             of power and computation of the specific
             mechanical energy
Appendix J - Acoustic method of discharge measurement
Annex ZA (normative) Other international publications quoted
in this standard with the reference of the relevant European
publications

Deals with field acceptance tests of hydraulic turbines, storage pumps or pump turbines. Defines the terms and quantities which are used; specifies methods of testing and ways of measuring the quantities involved in order to ascertain hydraulic performance. Covers the arrangements for tests at the site to determine the extent to which the main contract guarantees have been satisfied. Applies to any size and type of impulse or reaction turbine, storage pump or pump turbine. Particularly applies to machines coupled to electric generators, motors or motor-generators. Applies to machines with unit power greater than 5 MW or with reference diameter greater than 3 m.