ISO 4679:2023 PDF

Ships and marine technology — Hydraulic performance tests for waterjet propulsion system

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Название (английский):

ISO 4679:2023

Ships and marine technology — Hydraulic performance tests for waterjet propulsion system

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 18
Дата публикации:: 19 июня 2023 г.
Издание:: ISO IS 4679 edition 1 version 1
ICS:: 47.020.20

Язык документа:

ruen

Срок поставки:3 раб. дн. (перевод)

Цена:270 €

Описание (английский):

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.

Технические детали

Технический комитет: ISO/TC 8/SC 8 - Ship design
SKU: ISO 4679:2023

Abstract

Overview

ISO 4679:2023 - Ships and marine technology - Hydraulic performance tests for waterjet propulsion system - defines measurement methods, acceptance criteria and test-report requirements for hydraulic performance testing of waterjet propulsion systems. It covers tests for waterjet pumps with and without inlet ducts, specifies two precision grades (Class A and Class B), and sets the conditions and equipment requirements needed to achieve the stated accuracy. The standard excludes ancillary parts of the waterjet unit such as steering/reversing gear, hydraulic systems and control systems.

Key topics and technical requirements

Scope and precision grades
- Class A: precision grade for hydraulic model tests.
- Class B: precision grade for acceptance tests of small and mid-sized or intermediate test models.
Measured and derived parameters
- Direct measurements: flow rate, pressure (inlet/outlet), torque, rotational speed.
- Derived values: pump total head, shaft power, pump efficiency.
Acceptance criteria (percent of guarantee values) - Table values from the standard:
- Flow rate: Class A ±1.5%, Class B ±2.0%
- Speed of rotation: Class A ±0.2%, Class B ±0.5%
- Torque: Class A ±1.0%, Class B ±1.4%
- Pump total head: Class A ±1.0%, Class B ±1.5%
- Pump power input: Class A ±1.0%, Class B ±1.5%
- Pump efficiency: Class A ±2.25%, Class B ±2.9%
Measurement range and operating windows
- Flow measured from 80% to 110% of the best-efficiency or duty point.
- Allowed speed variation: Class A ±20%; Class B range 60%–120% of specified speed.
Measurement uncertainty
- Statistical evaluation of random and systematic uncertainties, overall uncertainty, and conversion/translation of results to guarantee conditions.
Test methods and conditions
- Test location, personnel, dates, environment/water quality, test device requirements.
- Includes NPSH (Net Positive Suction Head) testing and recommendations for buffering high fluctuations in signals.
Reporting
- Test report content and informative annexes provided (Annex A: test report example; Annex B: working section of test device).

Practical applications and users

ISO 4679 is used to:

Validate waterjet pump performance during design, model testing and factory acceptance.
Provide a contractually agreed method and acceptance criteria between manufacturers and purchasers.
Support classification societies, marine test laboratories, naval architects, shipbuilders, and marine systems integrators in producing reproducible, traceable hydraulic test results.

Related standards

ISO 9906 (rotodynamic pumps - test codes): referenced for head definitions.
ISO 17769 (pump terminology and test concepts): referenced for power/efficiency definitions.

Keywords: ISO 4679, waterjet propulsion, hydraulic performance tests, waterjet pump, measurement uncertainty, acceptance criteria, Class A, Class B, NPSH, marine testing.

Overview

Key topics and technical requirements

Scope and precision grades
- Class A: precision grade for hydraulic model tests.
- Class B: precision grade for acceptance tests of small and mid-sized or intermediate test models.
Measured and derived parameters
- Direct measurements: flow rate, pressure (inlet/outlet), torque, rotational speed.
- Derived values: pump total head, shaft power, pump efficiency.
Acceptance criteria (percent of guarantee values) - Table values from the standard:
- Flow rate: Class A ±1.5%, Class B ±2.0%
- Speed of rotation: Class A ±0.2%, Class B ±0.5%
- Torque: Class A ±1.0%, Class B ±1.4%
- Pump total head: Class A ±1.0%, Class B ±1.5%
- Pump power input: Class A ±1.0%, Class B ±1.5%
- Pump efficiency: Class A ±2.25%, Class B ±2.9%
Measurement range and operating windows
- Flow measured from 80% to 110% of the best-efficiency or duty point.
- Allowed speed variation: Class A ±20%; Class B range 60%–120% of specified speed.
Measurement uncertainty
- Statistical evaluation of random and systematic uncertainties, overall uncertainty, and conversion/translation of results to guarantee conditions.
Test methods and conditions
- Test location, personnel, dates, environment/water quality, test device requirements.
- Includes NPSH (Net Positive Suction Head) testing and recommendations for buffering high fluctuations in signals.
Reporting
- Test report content and informative annexes provided (Annex A: test report example; Annex B: working section of test device).

Practical applications and users

ISO 4679 is used to:

Validate waterjet pump performance during design, model testing and factory acceptance.
Provide a contractually agreed method and acceptance criteria between manufacturers and purchasers.
Support classification societies, marine test laboratories, naval architects, shipbuilders, and marine systems integrators in producing reproducible, traceable hydraulic test results.

Related standards

ISO 9906 (rotodynamic pumps - test codes): referenced for head definitions.
ISO 17769 (pump terminology and test concepts): referenced for power/efficiency definitions.

Keywords: ISO 4679, waterjet propulsion, hydraulic performance tests, waterjet pump, measurement uncertainty, acceptance criteria, Class A, Class B, NPSH, marine testing.

ISO 4679:2023 PDF

Технические детали

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Похожие стандарты

Abstract

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Похожие стандарты

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