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GB/T 40074-2021: General requirements for saturation diving system
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General requirements for saturation diving system
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GB/T 40074-2021
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Standard similar to GB/T 40074-2021 GB/T 35371 GB/T 35370 Basic data | Standard ID | GB/T 40074-2021 (GB/T40074-2021) | | Description (Translated English) | General requirements for saturation diving system | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | U99 | | Word Count Estimation | 18,123 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 40074-2021: General requirements for saturation diving system---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.
General requirements for saturation diving system
ICS 47.020.01
U99
National Standards of People's Republic of China
General requirements for saturation diving systems
Released on 2021-04-30
2021-11-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Classification and composition 2
4.1 Classification 2
4.2 Composition 2
5 Technical requirements 3
5.1 General requirements 3
5.2 Diving Bell 4
5.3 Deck decompression chamber 6
5.4 High-pressure rescue cabin 7
5.5 Life Support System 8
5.6 Lifting and reclaiming device 9
5.7 Electrical equipment and communication system 10
6 Inspection rules 11
6.1 General requirements 11
6.2 Factory inspection of equipment 11
6.3 Mooring test 12
6.4 Saturation diving test 12
6.5 Delivery inspection 12
7 Marking, packaging, transportation and storage 12
7.1 Sign 12
7.2 Packaging 13
7.3 Transportation and storage 14
General requirements for saturation diving systems
1 Scope
This standard specifies the classification and composition, technical requirements, inspection rules and markings, packaging, transportation and storage of saturation diving systems.
This standard applies to the design, construction and acceptance of saturation diving systems.
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 150.4 Pressure Vessel Part 4.Manufacturing, Inspection and Acceptance
GB/T 191 Packaging, storage and transportation pictorial signs
GB/T 7061 Marine low-voltage switchgear and control equipment
GB/T 7134 Casting type industrial plexiglass sheet
GB/T 9174 General technical requirements for general cargo transportation packaging
GB/T 11634 General technical conditions for marine AC low-voltage switchboards
GB/T 13407 Terminology for submersibles and underwater devices
GB/T 16560-2011 Deck decompression chamber
CB/T 4191 Technical conditions for manufacturing pressure-resistant structures of submersibles and underwater devices
CB/T 4192 Technical requirements for pressure-resistant structural materials for submersibles and underwater devices
IMOResolutionA.831(19) Diving System Safety Rules (TheCodeofSafetyforDivingSystems)
3 Terms and definitions
The following terms and definitions defined in GB/T 13407 apply to this document.
3.1
Saturation diving system
A diving system that can make the inert gas in the diver's body tissue reach a saturated state, and is mostly used for long-term and deep-diving operations
surroundings.
3.1.1
Fixed saturation diving system buildinsaturationdivingsystem
As a component of the mother ship or offshore platform, it is a saturation diving system installed in a fixed form on a dedicated mother ship or offshore platform.
3.1.2
Mobile saturation diving system transferablesaturationdivingsystem
A modular saturation diving system that is easy to disassemble and transport.
3.2
Livingchamber
In a saturation diving system, a deck decompression chamber for divers to live and rest.
3.3
Transition cabin entrylock
A balance cabin for divers to enter and exit different pressure environments.
Note. Rewrite GB/T 16560-2011, definition 3.3.
3.4
Hyperbaricrescuechamber
It can be separated from the diving system cabin group and has a life support system, which is convenient for lifting and transportation, and is used to transfer to high-pressure environments in emergency situations
Special cabin for divers.
3.5
Life support system
Provide a safe and comfortable environment for divers to maintain a complete set of systems and devices for their life activities and working capabilities.
Note. Rewrite GB/T 16560-2011, definition 3.5.
3.6
Gas delivery system
A complete set of systems and devices used to provide air and mixed gas during diving operations.
3.7
Hotwatersystem
A complete set of water supply systems and devices used to provide thermal protection for divers during diving operations.
3.8
Helium recovery system heliumreclamationsystem
A complete system and device for recycling the helium-oxygen mixture in diving bells, deck decompression chambers and other equipment.
3.9
Diliverytube
Under pressure, it is used to transfer goods between inside and outside the deck decompression cabin.
Note. Rewrite GB/T 16560-2011, definition 3.4.
4 Classification and composition
4.1 Classification
Saturation diving systems are mainly divided into the following two categories.
a) Fixed saturation diving system;
b) Motorized saturation diving system.
4.2 Composition
The saturation diving system consists of at least the following six parts.
a) diving bell;
b) Deck decompression cabins (including living cabins and transition cabins);
c) High-pressure rescue cabin;
d) Life support system (including environmental control system, gas supply system, hot water system and sanitation system, etc.);
e) Lifting and recovering devices (including winches, lifting frames, main crane steel cables, heave compensation devices, etc.);
f) Electrical equipment and communication systems (including power supply, lighting, monitoring systems and communication alarm systems, etc.).
5 Technical requirements
5.1 General requirements
5.1.1 Environmental adaptability
5.1.1.1 The equipment and systems installed on the mother ship, such as deck decompression chambers, life support systems, etc., should be within the range of environmental conditions specified below
normal work.
a) Temperature. -28℃~55℃ in the atmosphere;
b) Humidity. relative humidity up to 100%;
c) The salt content of the air. not more than 2mg/m3;
d) Tilt and roll. the heel is ±15°, the pitch is ±5°, the roll is ±22.5°, and the pitch is ±10°;
e) Vibration. The system should be able to withstand the hull vibration caused by the ship sailing and the local vibration of other machinery.
5.1.1.2 Equipment that can be hung in the water, such as diving bells and bell equipment, etc., shall not only meet the requirements of 5.1.1.1, but also meet the following underwater requirements.
(Sea water) requirements.
a) Temperature. -2℃~32℃;
b) Salt content (in sea water). 35000μg/g;
c) Tilt and swing. the diving bell has a roll of ±22.5° and a roll of ±45°.
5.1.2 Materials
5.1.2.1 The saturation diving system should use materials that comply with the relevant national policies, laws and regulations. The domestic materials should be selected first.
Materials with good process adaptability, the selected materials should have the highest cost-effectiveness ratio; the materials installed on the main structure of the ship's exposed deck equipment
The material should have good corrosion resistance.
5.1.2.2 The mechanical properties, physical properties and specifications and dimensions of the material shall meet the technical performance requirements of the product; for those with special requirements, except for those with special requirements.
In addition to the mechanical properties, the selected materials should also meet the corresponding specific performance requirements, such as damping performance, light radiation resistance, high temperature performance, and low temperature performance.
The performance should be as small as possible, and the structural weight should be as small as possible; the performance of substitute materials and materials using new processes and new technologies should not be lower than the original selected materials
Performance.
5.1.2.3 The selected surface coating material should not cause harm to the human body due to the content of harmful gas volatilized, and its toxicity test should generally be ordered by
The medical research unit recognized by the party organizes the conduct and puts forward concluding opinions.
5.1.2.4 Materials with a high degree of generalization shall be used as much as possible.
5.1.2.5 The compatibility of materials shall be fully considered. Steel plates, section steels, steel forgings, welding materials, etc. for pressure-resistant structures shall comply with CB/T 4192
Requirements. Plexiglass plates for pressure observation windows should meet the requirements of GB/T 7134.
5.1.3 Interface
5.1.3.1 The mechanical interface requirements are as follows.
a) Priority should be given to the use of corrosion-resistant metal standard series joints that can withstand the maximum working pressure;
b) When the joints are arranged, safety measures to avoid damage should also be considered;
c) The devices and equipment of the saturation diving system and the mother ship or platform structure equipped with the saturation diving system should be connected through the base;
d) Vibrating equipment should take vibration isolation measures at the installation interface;
e) The installation interface of each module of the motorized saturation diving system should be easy to install and disassemble quickly.
5.1.3.2 The electrical interface requirements are as follows.
a) The power interface of each device of the saturation diving system should match the mother ship or platform equipped with the saturation diving system;
b) Various communication interfaces should match the corresponding system of the mother ship or platform.
5.1.4 Security
5.1.4.1 The fire protection, fire detection, fire alarm and fire suppression of the system shall comply with the relevant regulations of IMO Resolution A.831 (19).
5.1.4.2 The arrangement and installation of structure, system piping, and equipment should be firm and reliable.
To protect the safety of personnel and equipment.
5.1.4.3 When the saturation diving system is arranged and installed on the mother ship, the placement of the deck decompression chamber should take into account the influence of the mother ship's sway, and the saturation diving system
There should be no flammable and explosive materials and gas sources near the water system installation area.
5.1.5 Maintainability
5.1.5.1 The design and manufacture of saturation diving systems shall fully consider the maintainability requirements of each device and equipment, and maintain the components and parts of the device and equipment.
Repairs should minimize disassembly, and the repair and inspection parts should be easy to access and operate.
5.1.5.2 When the motorized saturation diving system is stored on land, there should be a fixed space, and the space should have good maintenance conditions.
5.1.6 Reliability
5.1.6.1 The design of the saturation diving system should focus on preventing, discovering and correcting design and manufacturing defects, and adopt mature reliability design,
Analysis and testing techniques.
5.1.6.2 The mechanical devices and electrical equipment in the saturation diving system should use tested and reliable parts and components as much as possible.
part.
5.1.6.3 The life support system and the lifting and recovering device shall be designed with redundancy in mind.
5.1.7 Other
5.1.7.1 Saturation diving system should adopt modular design as far as possible.
5.1.7.2 Standard parts should be used for saturation diving systems, and standard parts that meet the current national and industry standards are preferred.
5.2 Diving bell
5.2.1 General requirements
5.2.1.1 The diving bell should be able to safely and reliably lower the rated number of divers from the surface to the operating water within the designed operating depth.
Deep and retracted from the operating water depth to the water surface.
5.2.1.2 The diving bell should have sufficient internal dimensions to accommodate the number of divers and their equipment required by the rating.
5.2.1.3 The inner diameter of the entry and exit hatch of the diving bell should not be less than 700mm.
5.2.1.4 The penetrating parts, sealing surfaces, gas cylinders, etc. outside the diving bell should be equipped with protective devices to avoid mechanical damage.
5.2.1.5 The exterior coating of the diving bell should be orange and other colors that are easy to attract attention.
5.2.1.6 The arrangement of the external equipment and facilities of the diving bell should be compact and orderly.
damage.
5.2.1.7 The diving bell should have sufficient stability under normal operating conditions and emergency conditions.
5.2.1.8 The diving bell that relies on self-floating emergency buoyancy shall have sufficient positive buoyancy after being freed from the umbilical cord and the hanging recovery device.
5.2.2 Pressure-resistant shell
5.2.2.1 The materials used for the pressure shell shall meet the requirements of 5.1.2.
5.2.2.2 The assembly and welding of the pressure shell shall meet the relevant requirements of CB/T 4191.
5.2.2.3 After the pressure shell is manufactured, the internal pressure strength test shall be carried out. The test pressure shall be 1.5 times the maximum working pressure, and the test medium shall be dry.
Clean fresh water without impurities. During the test, the water temperature should be kept above 4℃, and the ambient temperature should be kept above 0℃. If the plexiglass observation window is compatible with
When the pressure shell is tested together, the temperature of the test medium is lower than the design temperature of the plexiglass window and should not exceed 14°C. During the test, the pressure shell
There should be no leakage, no visible deformation and abnormal sound.
5.2.2.4 After the pressure-resistant shell is manufactured, an external pressure strength test shall be carried out. The test pressure is 1.25 times the maximum working pressure, and the test medium is
Clean fresh water without impurities. During the test, the water temperature should be kept above 4℃, and the ambient temperature should be kept above 0℃. If the plexiglass observation window is
When the pressure-resistant shell is tested together, the temperature of the test medium should not exceed 14℃ lower than the design temperature of the plexiglass window.
The requirements in GB/T 150.4 measure the roundness of the pressure housing, and the measurement deviation should not exceed the maximum allowable specified in GB/T 150.4.
Xu deviation.
5.2.2.5 Air tightness test is to be carried out after the pressure-resistant shell is manufactured, the test pressure is the maximum working pressure, and the test medium is to be filled into the tank
The most easily leaking working gas or the gas with similar leakage performance such as helium, hydrogen, etc., the test environment temperature should be kept above 0℃, 4h
The pressure drop inside should not exceed 1%, and the influence of temperature changes should be considered.
5.2.2.6 Observation windows should be provided on the pressure-resistant shell. The number and arrangement of observation windows should not only facilitate the observation of internal personnel, but also meet the requirements of external personnel.
Observation within.
5.2.3 Interface
5.2.3.1 All penetrations of water and gas pipelines are to be provided with venting valves on both the inner and outer sides of the pressure hull, and all connections shall be clearly marked.
Nameplate.
5.2.3.2 The design and installation of electrical penetrations should be able to adapt to the pressure environment on the bell, and at least twice the design pressure of the pressure housing is required.
Test, and can withstand the two-way pressure inside and outside the pressure shell.
5.2.4 Air supply
5.2.4.1 The gas supply pipeline and accessories configured on the diving bell shall meet the requirements of 5.5.3.
5.2.4.2 The designed air supply pipeline should ensure that the diver's breathing will not be affected when the diving bell is ventilated or flushed.
5.2.4.3 Each diver in the diving bell should have an independent breathing device, which can supply air from the surface or from an emergency cylinder on the bell.
5.2.4.4 There should be a diver's gas cylinder on the diving bell, and the gas storage in the cylinder should ensure that a diver stops at the maximum depth of the diving operation outside the bell.
Leave it for more than 30 minutes.
5.2.5 Heating
5.2.5.1 A set of controllable normal heating system is to be provided in the diving bell, and the system shall be sufficient to enable divers inside and outside the diving bell to have
The right temperature.
5.2.5.2 There should be an emergency heating system or other equivalent means in the diving bell.
The diver in the water clock maintains a normal body temperature within 24 hours.
5.2.6 Power supply
5.2.6.1 The power supply equipment and facilities on the diving bell shall meet the requirements of 5.7.
5.2.6.2 The emergency power supply shall be installed in the diving bell and shall meet the corresponding requirements of 5.7.2.
5.2.7 Facilities in the diving bell
5.2.7.1 A suitable seat should be provided for each diver in the diving bell, and the seat should be equipped with a safety belt.
5.2.7.2 Auxiliary lifting equipment should be provided in the diving bell for the lifting of divers and equipment.
5.2.7.3 An overpressure alarm device should be installed in the diving bell.
5.2.7.4 A pressure gauge that can display the internal and external pressure of the diving bell and the pressure of the emergency gas cylinder on the bell should be installed in the diving bell to display the internal and external pressures of the diving bell.
The accuracy of the pressure gauge should not be lower than 0.4.
5.2.7.5 A clearly marked medical first aid kit should be provided in the diving bell.
5.2.7.6 The diving bell should be equipped with easy-to-read oxygen detection equipment and carbon dioxide detection equipment.
5.2.7.7 The diving bell should be equipped with a carbon dioxide removal device, and the ability to remove carbon dioxide should not be lower than one standard atmospheric pressure.
The processing capacity is 22L/h per person.
5.2.7.8 Appropriate lighting should be provided in the diving bell, and the illuminance should meet the needs of divers for activities and operations in the diving bell, and emergency response should be provided.
illumination.
5.2.8 Umbilical cord
5.2.8.1 The diving bell should be equipped with a diving bell umbilical cord and a diver's umbilical cord. The length of the umbilical cord is based on the working depth of the diving bell and the diver's patrol dive.
The scope is determined.
5.2.8.2 The umbilical hose should have a breaking pressure of at least 4 times the working pressure of the system, and its rated pressure should not be lower than the system pressure. In addition, the umbilical
The rated pressure with hose should not be lower than the pressure equivalent to the design depth plus 2.8MPa.
5.2.8.3 The umbilical cord hose should have anti-twisting performance or its layout can be anti-twisting.
5.2.8.4 The joints of the umbilical cord shall be resistant to corrosion and accidental removal, and the rated pressure of the joint shall not be lower than the rated pressure of the hose.
5.2.8.5 The hot water pipe should be able to withstand the corresponding temperature.
5.2.8.6 If the umbilical cord is used as a backup facility for the recovery of the diving bell, the umbilical cord should be equipped with a strong force that can withstand the load on the diving bell when the diving bell is lifted.
member.
5.2.9 Emergency equipment
5.2.9.1 The diving bell should have an independent emergency hoisting system that has nothing to do with the main hoisting wire rope, fairlead, and umbilical cord.
5.2.9.2 If dumping heavy objects and dumping equipment are set on the diving bell, measures to prevent accidental release should be considered.
5.2.9.3 When an emergency buoyancy system is installed on the diving bell, the emergency buoyancy system should be able to operate in the diving bell, and the activation of each device should be at least
Two reliable independent steps are completed.
5.2.9.4 A diving bell emergency positioning system shall be provided, which shall comply with the requirements of 2.12.5 in IMOResolutionA.831(19).
5.2.10 Buoyant material
5.2.10.1 If buoyant materials are used on the exterior of the diving bell, the hydraulic crush strength of the buoyant materials used shall not be lower than the maximum working depth
1.5 times the downforce.
5.2.10.2 The buoyant material can be formed by bonding, but its tensile strength and shear strength after bonding should not be lower than that of the original buoyant material.
performance.
5.3 Deck decompression chamber
5.3.1 General requirements
5.3.1.1 The deck decompression cabin configured in the saturation diving system should include a living cabin and a transition cabin. The living cabin is used for the living and living of the divers.
The cabins are used for divers to enter and exit different areas.
5.3.1.2 The space in the deck decompression chamber should be able to meet the needs of divers for daily life and rest and equipment arrangement in a high-pressure environment for a long time.
Needs.
5.3.1.3 The inner diameter of the deck decompression tank shall not be less than 2100mm.
5.3.1.4 Doors are to be provided between the entrances and exits of the deck decompression tanks and between the cabins, and pressure balance valves are to be installed on the doors.
5.3.1.5 The hatch should be able to be opened on both sides, and the hatch can be fixed after it is opened.
5.3.1.6 The inner diameter of the entrance and exit of the deck decompression chamber should not be less than 600mm, and the entrance and exit should be arranged to facilitate the entry and exit of the cabin.
5.3.1.7 The exterior surface of the deck decompression tank is to be flat and smooth, and the external piping and equipment layout is to be compact and orderly.
5.3.2 Pressure-resistant shell
The pressure hull of the deck decompression tank should meet the requirements of 5.2.2.1~5.2.2.3, 5.2.2.5 and 5.2.2.6.
5.3.3 Interface
5.3.3.1 The interface shall meet the requirements of 5.2.3.
5.3.3.2 A butt locking device is to be provided at the interface between the deck decompression chamber and the diving bell, and a mechanical method is used to achieve locking.
5.3.4 Air supply
The gas supply pipeline and accessories of the deck decompression tank shall meet the requirements of 5.5.3.
5.3.5 Heating
If no environmental control equipment is installed in the transition compartment, a controllable heating system should be provided.
5.3.6 Power supply
The power supply equipment and facilities of the deck decompression tank shall meet the requirements of 5.7.
5.3.7 Environmental control
The environmental control system piping, accessories and equipment configured in the deck decompression chamber shall meet the relevant requirements of 5.5.2.
5.3.8 In-cabin facilities
5.3.8.1 The internal facilities of the deck decompression chamber shall comply with the relevant requirements in 5.3 of GB/T 16560-2011.
5.3.8.2 The deck decompression chamber should have suitable lighting and be able to meet the needs of divers to observe the instruments, activities and operations in the cabin.
5.3.8.3 The deck decompression chamber is to be equipped with easy-to-read oxygen analysis equipment and carbon dioxide concentration analysis equipment.
5.3.9 Insulation
All deck decompression tank shells should be covered with heat-preserving and flame-retardant insulation materials.
5.3.10 Delivery barrel
5.3.10.1 At least one delivery tube should be provided in each compartment, and the location of the delivery tube should be convenient for the operations of personnel inside and outside the cabin.
5.3.10.2 The inner diameter of the delivery tube shall not be less than 300mm.
5.3.10.3 The outer cover of the delivery cylinder should be equipped with a safety interlock device, the locking pressure should not be greater than 0.02MPa, and the reset pressure should not be greater than
0.01MPa, a pressure gauge with an accuracy of no less than 2.5 should be installed on the delivery barrel, and a balance valve should be installed on the inner cover.
5.4 High-pressure rescue chamber
5.4.1 The saturation diving system should be equipped with a high-pressure rescue chamber for the rescue and evacuation of divers in saturation diving in an emergency.
5.4.2 The pressure hull of the high-pressure rescue chamber should meet the requirements of 5.2.2.1~5.2.2.3, 5.2.2.5, and 5.2.2.6.
5.4.3 The interior of the high-pressure rescue cabin should be able to accommodate all divers under pressure in the saturation diving system.
5.4.4 A positioning device should be provided on the high-pressure rescue capsule to facilitate search and rescue.
5.4.5 The high-pressure rescue capsule should be able to be quickly released and separated from the saturation diving system, and be able to float on the surface when it is full.
5.4.6 A medical first aid kit should be provided in the high-pressure rescue cabin.
5.4.7 The on-board life support system of the high-pressure rescue cabin should be able to meet the requirements of divers living in the cabin for at least 72 hours without external support.
5.4.8 The connections between the high-pressure rescue cabin and the external system pipelines and electrical communication should be reliable connections that can be quickly disconnected.
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