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GB/T 15469.2-2007: Hydraulic turbines, storage pumps and pump-turbines -- Cavitation pitting evaluation -- Part 2: Cavitation pitting evaluation in storage pumps and pump-turbines
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Hydraulic turbines, storage pumps and pump-turbines -- Cavitation pitting evaluation -- Part 2: Cavitation pitting evaluation in storage pumps and pump-turbines
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GB/T 15469.2-2007
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Basic data | Standard ID | GB/T 15469.2-2007 (GB/T15469.2-2007) | | Description (Translated English) | Hydraulic turbines, storage pumps and pump-turbines -- Cavitation pitting evaluation -- Part 2: Cavitation pitting evaluation in storage pumps and pump-turbines | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K55 | | Classification of International Standard | 27.140 | | Word Count Estimation | 19,125 | | Date of Issue | 2007-12-03 | | Date of Implementation | 2008-05-01 | | Quoted Standard | GB/T 2900.45; GB/T 19184; GB/T 15468; GB/T 15469 | | Adopted Standard | IEC 60609-1-2004, MOD | | Regulation (derived from) | China Announcement of Newly Approved National Standards No. 12 of 2007 (No. 112 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 15469.2-2007: Hydraulic turbines, storage pumps and pump-turbines -- Cavitation pitting evaluation -- Part 2: Cavitation pitting evaluation in storage pumps and pump-turbines
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. Hydraulic turbines, storage pumps and pump-turbines Cavitation pitting evaluation Part 2. Cavitation pitting evaluation in storage pumps and pump-turbines
ICS 27.140
K55
National Standards of People's Republic of China
Turbines, storage pumps and pump - turbines cavitation pitting evaluation
Part 2. storage pumps and pump turbines
Cavitation assessment
(IEC 60609-1.2004, Hydraulicturbines, storagepumpsandpump-turbines
Cavitationpittingevaluation-Part 1. Evaluationinreactionturbines,
storagepumpsandpump-turbines, MOD)
Posted 2007-12-03 2008-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
Introduction Ⅱ
1 Scope 1
1.1 Overview 1
1.2 does not contain the contents of 1
Effect of chemical composition of the water to 1.3 Cavitation 1
Effect of solid particles containing a water 1.4
2 Normative references 2
3 Terms, definitions, symbols and units 2
3.1 Terms, definitions and symbols 2
3.2 Unit 5
4 cavitation guaranteed 6
4.1 guarantee period of six
OK 6 4.2 cavitation guaranteed value
4.3 operating range and running time 7
5 8 program
5.1 cavitation warranty period repair 8
5.2 Measurement and Calculation of the amount of cavitation 8
And ensure the implementation of the calculation results of 6 9
Appendix A (normative) Examples of cavitation guaranteed 10
Annex B (informative) of this section with IEC 60609-1.2004 technical differences and their reasons 13
Foreword
GB/T 15469 "turbines, storage pumps and pump - turbines cavitation assessment" is divided into the following three parts.
--- Part 1. reaction turbines cavitation assessment;
--- Part 2. storage pumps and pump - turbines cavitation assessment;
--- Part 3. Pelton turbine cavitation assessment.
This section GB/T 15469 Part 2.
The partial modification of the International Electrotechnical Commission IEC 60609-1.2004 "turbines, storage pumps and pump - turbines cavitation pitting evaluation 1
Part I. reaction turbines, storage pumps and pump turbines assessment, "and depending on the circumstances of storage pumps and pump turbines were
Changes related to technical differences in the terms they are involved in the margin of a single vertical line identified by. These techniques are given in Appendix B
List of differences and the reasons for the reference.
Appendix A of this section is normative appendix, Appendix B is an informative annex.
This part is proposed by the China Electrical Equipment Industrial Association.
This part of the National Standardization Technical Committee turbine (SAC/TC175) centralized.
This part mainly drafted by. Dongfang Electrical Machinery Co., Ltd., China Institute of Water Resources and Hydropower, Harbin Electric Machinery Co., Ltd.
The company, China Resources Group Beijing Survey and Design Institute consultant, Guangzhou Pumped Storage Power Station.
The main drafters of this section. Hi Tao group, Wupei Hao, Wu Xinrun, Jiang Mu, Heguang Jiang, Liu Qi.
This section first release.
Introduction
This section provides cavitation assess storage pumps and pump turbines.
Storage pumps, pump turbine cavitation extent depends on the following five factors.
Type and design a) equipment;
b) material and surface state of the site of action of cavitation;
c) Install the elevation equipment, namely power stations cavitation coefficient (σp);
d) duration of operation and operating conditions;
e) water quality.
a), b) depending on the status of the device, and c), d), e) depending on the conditions of plant operation. Thus, cavitation guaranteed only by the supply and demand sides
Power plant planning and design stage or agreed in the contract. When the rotor/impeller renovation or require a wider operating range for the tender side
In response cavitation performance assurances recommendations.
Cavitation can use the following two methods to ensure the consultation.
First, according to the contract in a given installation elevation device (corresponding to the power plant cavitation coefficient σp), according to the storage pump or pump turbine size,
Speed, material, surface condition and operating conditions and other consultations cavitation guaranteed value (see Figure 1a));
Second, in determining the maximum allowable amount of cavitation conditions negotiated unit installation elevation (see Figure 1b)).
In most cases, the unit normal operation without cavitation conditions, or be required to operate without cavitation conditions, sometimes for economic
Reasons, but also it allows a slight cavitation, installing the elevation device can be higher than the elevation of cavitation-free operation.
Since each station a) ~ e) the items are different, so the development of a common acceptable cavitation allowable value is not appropriate. because
This is recommended economic assessment based on conditions of each plant. For example, the installation of a deeper elevation (greater station cavitation coefficient σp
Values require higher costs of civil engineering) and/or more expensive rotor/impeller (shape and/or materials) can reduce the amount of cavitation. Higher costs associated with
Benefits are lower operating costs and reduce maintenance frequency, and can reduce downtime because of power loss.
Cavitation depth, volume and mass of the rotor/impeller diameter and function, see Appendix A.
a)
b)
1 hydro-mechanical cavitation in the flow diagram a certain amount as a function of power plant cavitation coefficient
Turbines, storage pumps and pump - turbines cavitation pitting evaluation
Part 2. storage pumps and pump turbines
Cavitation assessment
1 Scope
1.1 Overview
This section provides storage pumps and pump turbines in the given conditions (as specified in the contract power, hydro energy density, speed, material,
Operating conditions and running time) measurement and evaluation methods flow components due to cavitation caused by the loss of material.
In the contract should specify whether the presence of cavitation hydraulic machinery in all or part of the operating range.
Regardless of whether cavitation occurs, it should be clearly defined in the contract cavitation guaranteed.
Described in this section also apply to the relevant station storage pumping station.
1.2 content does not contain
This section does not include the potential impact on other cavitation performance equipment to produce, for example.
--- Power, efficiency, vibration, noise and the overall mechanical properties;
--- In operation exposed material defects.
Operation due to excessive wear of flow parts and exposed material defects not included in the cavitation guarantee.
Coating with a protective layer over the surface of the abrasive flow is not included in the cavitation guarantee.
1.3 Effect of chemical composition of the water to cavitation
This section assumes that the water does not contain corrosive chemicals, if you want to consider aggressive chemicals contained in the water, should be given in the agreement
The results of the analysis of water quality, and based on this make cavitation guarantee. Because the chemical resistance relates to the chemical composition of materials and equipment, and many other reason
Su, within this scope of this section to determine the limits.
If the show corrosive water is greater than a given value of the agreement was in the process of further analysis, in assessing the cavitation guarantee are met,
It must consider the impact of corrosive water. If the area appears cavitation can be distinguished due to the effects of chemical etching or electrochemical corrosion
The increase, which will increase the destruction of part of the cavitation should be excluded from the scope of assessment.
1.4 Effect of water containing solid particles
Water and solid particles such as silt caused by wear and tear are not considered as cavitation. When the device is running in water containing a large amount of solid particles when,
Material loss due to cavitation (if present) with the combined effects of wear and intensified. Further, when the surface of the material due to abrasion changed as a result of water
Force profile changes may be caused by cavitation and intensified. Cavitation damage and wear are not similar in appearance, location and mechanism, so in measuring damage
When can distinguish between the two is very important. If the area appears cavitation can be distinguished due to the impact of the increased wear and tear, which increases
Plus damaged parts should be assessed in addition to the cavitation.
Cavitation case volume and measurement methods given in this section apply only to cavitation. Every year at least for some period of time in a solid containing a large amount
Hydropower is running water particles, the extent of damage due to wear caused by solid particles depends on many aspects of factors, such as particle concentration
Degree, mineral composition, particle size gradation and impact parameters (such as the relative speed and angle of impact) as well as material properties and operating conditions of hydraulic machinery
Etc., which is beyond the acceptable in this part of the definition of the quantity of solid particles range.
Cavitation general water quality assessment is based. When water contains a small amount of solid particles, and wear and tear caused by the slight, it can be regarded as general water quality.
The water situation should be described in the contract documents the amount of particulate solids, and the corresponding types of minerals, particle size gradation. If the ratio is large,
Should be a special agreement, the agreement could be considered cavitation wear and damage area caused by solid particles separate, when it is difficult to distinguish between the two, it is recommended
Evaluation of the contract cavitation wear uniform consideration of solid particles and material loss caused by cavitation.
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