ISO 4679:2023

INTERNATIONAL ISO
STANDARD 4679
First edition
2023-06
Ships and marine technology —
Hydraulic performance tests for
waterjet propulsion system
Navires et technologie maritime — Essais de performance
hydraulique pour le système de propulsion hydrojet
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
4 Measurement and acceptance criteria . 3
4.1 General . 3
4.2 Measurement range . 4
4.3 Stable operating conditions of measuring systems . 4
4.4 E valuation of flow and head . 5
4.5 E valuation of efficiency or power . 5
5 Measurement uncertainty .6
5.1 General . 6
5.2 Statistical evaluation of overall measurement uncertainty . 6
5.2.1 E valuation of the random uncertainty . 6
5.2.2 E valuation of the systematic uncertainty . 6
5.2.3 Overall uncertainty . 7
5.2.4 Determination of overall uncertainty of efficiency . 7
5.3 Conversion . 8
5.3.1 Conversion to the guarantee conditions . 8
5.3.2 Translation of the test results. 8
6 Test method . 9
6.1 Test condition . 9
6.1.1 Test location . . 9
6.1.2 Test personnel . . 9
6.1.3 Test date . 9
6.1.4 Test outline . 9
6.1.5 Environment and water quality . . 9
6.2 Test device . 10
6.3 Test items . 10
6.3.1 General . 10
6.3.2 Performance test . 10
6.3.3 NPSH test . 11
7 Test report .11
Annex A (informative) Test report .12
Annex B (informative) Working section of the test device .15
Bibliography .18
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
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iv
INTERNATIONAL STANDARD ISO 4679:2023(E)
Ships and marine technology — Hydraulic performance
tests for waterjet propulsion system
1 Scope
This document specifies the measurement and acceptance criteria and the test report of hydraulic
performance tests for waterjet propulsion system of Class A and Class B.
The test methods for the waterjet propulsion pump with and without the inlet duct are both specified.
This document is applicable to the hydraulic performance test of water jet propulsion under the
specified test conditions. This document specifies the precision grade of Class A for hydraulic model
tests of water jet propulsion and Class B for acceptance tests of small and middle-sized or intermediate
test models.
In addition, this document specifies the test conditions of Class A and Class B, and recommendations
and requirements for test equipment to ensure that the test can be carried out under the conditions of
corresponding accuracy.
This document does not include miscellaneous parts of waterjet unit, such as steering and reversing
gear, hydraulic system and control system.
2 Normative references
There are no normative references in this document.
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
waterjet unit
unit that consists of waterjet propulsion system (3.2), steering and reversing gear, hydraulic system and
control system which is able to steer and reverse the main body
3.2
waterjet propulsion system
propulsion system that consists of waterjet pump (3.3), nozzle and inlet duct (generally the impeller of
waterjet pump is integrated with the nozzle) and that is able to drive the main body moving
3.3
waterjet pump
pump that transfers the energy of prime mover to water by rotating impeller
Note 1 to entry: The waterjet pump obtains a counter-acting force and drives the main body moving. It consists
of impeller, guide vane, shell and shaft (hereinafter referred to as “pump”). The main types are mixed-flow type
and axial flow type. The axial flow waterjet pump is one in which the liquid is discharged axially from the
impeller. The mixed-flow waterjet pump is one in which the liquid is discharged from impeller with an angle α (
09°<α <°0 ) to the shaft line, also called the inclined waterjet pump.
3.4
flow rate
Q
volume of liquid discharged by waterjet pump (3.3) per unit time
3.5
pump total head
H
algebraic difference between the outlet total head, H , and the inlet total head, H
2 1
Note 1 to entry: Pump total head is given by Formula (1):
HH=− H (1)
where
H is the inlet total head, expressed in Pa;
H is the outlet total head, expressed in Pa.
Note 2 to entry: Unless otherwise specified, the baseline of the head is the waterjet propulsion shaft line.
[SOURCE: ISO 9906:2012, 3.2.15, modified — notes 1 and 2 to entry have been modified.]
3.6
pump power input
P
power transmitted to the pump by its driver
[SOURCE: ISO 17769-1:2012, 2.1.11.2, modified — note 1 to entry has been deleted.]
3.7
pump efficiency
η
proportion of the pump power input (3.6), P, delivered as pump power output, P , at given operating
u
conditions
Note 1 to entry: Pump efficiency is given by Formula (2):
P
u
η= (2)
P
where
P is useful mechanical power transferred to the liquid during its passage through the pump, given
u
by Formula (3);
Pg=ρ QH (3)
u
[SOURCE: ISO 17769-1:2012, 2.1.12.1, modified — Formula (3) has been added and the symbols have
been explained.]
3.8
type number
K
dimensionless quantity, defined by Formula (4):
1 1
2 2
′ ′
2πnQ ωQ
K = = (4)
3 3
′ 4 ′ 4
()gH ()y
where
Q′ is volume flow rate per eye, expressed in m /s;
H′ is head of the first stage, expressed in m;
−1 −1
ω is expressed in time, like s , and n is expressed in 60 × min form.
Note 1 to entry: The type number should be taken according to the maximum
...