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GB 20826-2021: Code of safety for the use of high pressure water jetting equipment by divers
Status: Valid GB 20826: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 20826-2021 | English | 239 |
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Code of safety for the use of high pressure water jetting equipment by divers
| Valid |
GB 20826-2021
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| GB 20826-2007 | English | 439 |
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Code of safety for the use of high pressure water jetting operation by divers
| Obsolete |
GB 20826-2007
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Standard similar to GB 20826-2021 GB 16636 Basic data | Standard ID | GB 20826-2021 (GB20826-2021) | | Description (Translated English) | Code of safety for the use of high pressure water jetting equipment by divers | | Sector / Industry | National Standard | | Classification of Chinese Standard | R54 | | Word Count Estimation | 12,129 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB 20826-2021: Code of safety for the use of high pressure water jetting equipment by divers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Code of safety for the use of high pressure water jetting equipment by divers
ICS 03.220.40
R54
National Standards of People's Republic of China
Replace GB 20826-2007
Safety regulations for divers' high-pressure water jet operations
Released on 2021-08-10
2022-03-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Environmental conditions 1
5 Equipment requirements 2
6 Personnel requirements 3
7 Operating procedures 4
8 Maintenance and storage 5
9 Injury and emergency response 6
Appendix A (Normative Appendix) Safety Checklist 7 Before Underwater High Pressure Water Jet Operation
Appendix B (Normative Appendix) Wounded Transfer Information Card 8
Reference 9
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 20826-2007 "Safety Regulations for Diver High Pressure Water Jet Operations", compared with GB 20826-2007, except for editing
In addition to the changes, the main technical changes are as follows.
--- Deleted the terms and definitions of unloading water guns and intercepting water guns (see 2.3 and 2.4 of the.2007 edition);
---Modified the terms and definitions of high-pressure water jet and high-pressure water gun (see 3.1 and 3.3, 2.1 and 2.2 of the.2007 edition);
---The terms and definitions of ultra-high pressure water jets have been added (see 3.2);
---Modified the requirements of environmental conditions (see Chapter 4, Chapter 3 of the.2007 edition);
---Modified the equipment requirements for high-pressure hoses, spray booms and high-pressure water guns (see 5.2 and 5.3, 4.2, 4.3 and the.2007 edition
4.4);
---Added the requirements for the provision of divers (see 6.1.1.2);
---Modified diving supervision requirements (see 6.1.2, 5.1.1 of the.2007 edition);
---Modified the requirements for training and operation protection (see 6.2 and 6.3, 5.2 and 5.3 of the.2007 edition);
---Modified the requirements of the operating procedures (see Chapter 7, Chapter 6 of the.2007 edition);
--- Modified the maintenance and storage requirements (see 8.4, 8.5, 8.6 and 8.7, 7.4 and 7.5 in the.2007 edition);
---Modified the requirements for injury and emergency treatment (see Chapter 9, Chapter 8 of the.2007 edition);
---Modified the safety checklist before underwater high-pressure water jet operation (see Appendix A, Appendix A of the.2007 edition);
---Revised the injured transfer information card (see Appendix B, Appendix B of the.2007 edition);
--- Deleted the high-pressure water jet damage and disposal methods (see Appendix C of the.2007 edition).
This standard was proposed and managed by the Ministry of Transport of the People's Republic of China.
The previous versions of the standard replaced by this standard are as follows.
---GB 20826-2007.
Safety regulations for divers' high-pressure water jet operations
1 Scope
This standard specifies the environmental conditions, equipment requirements, personnel requirements, operating procedures, and maintenance guarantees for divers to implement underwater high-pressure water jet operations.
Raising and storage, injury and emergency treatment.
This standard applies to underwater high-pressure and ultra-high-pressure water jet operations performed by divers in the field of rescue and salvage.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 24555-2009.200m helium-oxygen saturation diving operation requirements
GB 26123 Air diving safety requirements
GB 28396 Safety requirements for mixed gas diving
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Highpressurewaterjetting
The working pressure is 10MPa~170MPa, and high-speed water streams of different shapes are formed by the nozzles.
3.2
Ultrahighpressurewaterjetting
The working pressure exceeds 170MPa, and high-speed water streams of different shapes are formed by the nozzles.
3.3
Highpressurejettinggun
A water jet device composed of a control valve, a gun barrel and a nozzle assembly (including one or more nozzles).
Note. According to the type of control valve, the high-pressure water gun can be divided into two types. unloading type and intercepting type. When the control valve is closed, the high-pressure water is released and divided through the overflow port of the safety valve
The water jet device that goes to the water environment is called an unloading water gun (dumpgun); when the control valve is closed, the high-pressure water remains in the water supply pipe of the water jet system
The water jet device in the line is called a shutoff gun.
3.4
Flexiblebuckle
A ring-shaped connection is made at the end joints of two connected hoses with flexible materials such as short steel wire ropes or cables.
4 Environmental conditions
4.1 Self-contained air diving underwater high-pressure water jet operations should meet the requirements of GB 26123.The water flow speed should not be greater than 0.5m/s, Beaufort
The wind level should not be greater than level 4 (wind speed 5.5m/s~7.9m/s, wave height 1.0m).
4.2 Surface-supplied air diving high-pressure water jet operations, when entering the water through the diving ladder, should meet the requirements of GB 26123.Water flow speed should
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