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AS ISO 9906:2018
[Current]Rotodynamic pumps — Hydraulic performance acceptance tests — Grades 1, 2 and 3
Adopts ISO 9906:2012 to specify hydraulic performance tests for customers' acceptance of rotodynamic pumps (centrifugal, mixed flow and axial pumps).
Published: 22/02/2018
Pages: 61
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and subscripts
3.1 Terms and definitions
3.1.1 General terms
3.1.1.3 non-witnessed pump test
3.2 Terms relating to quantities
3.3 Symbols and subscripts
4 Pump measurements and acceptance criteria
4.1 General
4.2 Guarantees
4.3 Measurement uncertainty
4.3.1 General
4.3.2 Fluctuations
4.3.3 Statistical evaluation of overall measurement uncertainty
4.3.3.1 The estimate of the random component (random uncertainty)
4.3.3.2 The estimate of the instrumental measurement uncertainty (systematic uncertainties)
4.3.3.3 The overall uncertainty
4.3.3.4 Determination of overall uncertainty of efficiency
4.4 Performance test acceptance grades and tolerances
4.4.1 General
4.4.2 Tolerances for pumps with an input power of 10 kW and below
4.4.3 Evaluation of flow and head
4.4.4 Evaluation of efficiency or power
4.5 Default test acceptance grades for pump application
5 Test procedures
5.1 General
5.2 Date of testing
5.3 Test programme
5.4 Testing equipment
5.5 Records and report
5.6 Test arrangements
5.7 Test conditions
5.7.1 Test procedure
5.7.2 Speed of rotation during test
5.8 NPSH tests
5.8.1 General
5.8.1.1 Objective of NPSH tests
5.8.2 NPSH test types
5.8.2.1 Type I test — Determination of NPSH3 for multiple flow rates
5.8.2.2 Type II test — Determination of NPSH3 for a single flow rate
5.8.2.3 Type III test — Verification of limited influence of cavitation on the performance at specified NPSHA
5.8.2.4 Type IV — Verification of guaranteed characteristics at specified NPSHA
5.8.2.5 Tolerance factor for NPSHR
6 Analysis
6.1 Translation of the test results to the guarantee conditions
6.1.1 Translation of the test results into data based on the specified speed of rotation and density
6.1.2 Test carried out with NPSHA different from that guaranteed
6.1.3 Performance curve
6.2 Obtaining specified characteristics
6.2.1 Reduction of impeller diameter
6.2.2 Requirement for retesting after reducing impeller diameters
Annex A
A.1 General
A.2 Measurement principles
A.3 Various measurement methods
A.4 Pump tested on a standardized installation
A.4.1 Inlet measuring section
A.4.2 Outlet measuring section
A.4.3 Pressure tappings
A.4.4 Correction for height difference
A.4.5 Simulated test arrangements
A.4.6 Pumps tested with fittings
A.4.7 Pumping installation under submerged conditions
A.4.8 Self-priming pumps
A.4.9 Friction losses at inlet and outlet
Annex B
B.1 General
B.2 Characteristics of the circuit
B.3 Characteristics of the test liquid
B.4 Determination of the vapour pressure
B.5 Types of installation
B.5.1 Closed loop arrangement
B.5.2 Open sump with level control
B.5.3 Open sump with throttle valve
Annex C
Annex D
D.1 Head measurement equipment
D.1.1 General
D.1.2 Spring pressure gauges
D.1.3 Electronic pressure transducers
D.2 Measurement of rotating speed
D.3 Measurement of flow rate
D.3.1 General
D.3.2 Measurement by weighing
D.3.3 Volumetric method
D.3.4 Differential pressure devices
D.3.5 Thin plate weirs
D.3.6 Velocity area methods
D.3.7 Electromagnetic method
D.3.8 Ultrasonic method
D.3.9 Tracer and other methods
D.4 Measurement of pump power input
D.4.1 General
D.4.2 Torque measurement
D.4.3 Electric power measurements
D.4.4 Special cases
D.4.4.1 Pumps with inaccessible ends
D.4.4.2 Deep-well pumps
D.4.4.3 Motor pump units with common axial bearing (other than close coupled pumps)
D.4.5 Measurement of pumping unit overall efficiency
Annex E
Annex F
F.1 Performance test report recommendations
F.1.1
F.1.2
F.2 NPSH test report recomendations
F.3 Pump test sheet
Annex G
G.1 General
Annex H
H.1 Physically witnessed pump test
H.2 Remotely witnessed pump test
Annex I
I.1 General
Annex J
Bibliography
Amendment control sheet
AS ISO 9906:2018 Amd 1:2022
Amendment No. 1 (2022)
Correction amendment
Cited references in this standard
Content history
[Current]
[Current]
[Superseded]
DR AS ISO 9906:2017
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