GB 28396-2012The safety requirement for mixed gas diving (English PDF)

3.1 Terms and Definitions

GB 26123 determined following terms and definitions apply to this document. 3.1.1. Heliox diving helioxdiving Use of heliox as a man made diving breathing gas, does not include helium-oxygen saturation diving. 3.1.2. Closed diving bell closedbel A shipping diver carrying the device serving between the surface and underwater sites, which can be closed bell body, and with the deck decompression chamber Docking.

3.1.3 Helium Voice heliumspeech Abnormal breathing during speech containing helium gas mixture. Wherein the voice fundamental frequency and the resonance frequency increases, timbre changes, was nasal, intelligibility reduce.

3.2 Abbreviations The following abbreviations are applicable to this document. BIBS

--- built-contained breathing apparatus (built-inbreathingsystem) JSA

--- Job Safety Analysis (jobsafetyanalysis) PTW

--- Work Permit (permittowork)

4 personnel requirements

Heliox divers, including divers, diving supervision, diving care staff, prepare diver, diving radio operator, life-support staff, latent Water diving medical technician and the physician, with its training, qualification and management should comply with the relevant requirements of the competent authorities. Or to be engaged in underwater operations into The high pressure environment of the physical conditions of personnel should meet the requirements of GB 20827.

5 device and system requirements

5.1 Personal harness GB 26123-2010

5.1.1 should be consistent with the relevant requirements of 5.1.1 - 5.1.11.

5.1.2 Emergency filling gas cylinders shall Heliox.

5.2 Umbilical cord and hose GB 26123-2010

5.2.1 should be consistent with the relevant requirements of 5.2.

5.2.2 should meet the requirements of the transport heliox.

5.2.3 transporting oxygen concentration of 25% or more of heliox should be treated with an oxygen hose predetermined.

5.3 Supply system

5.3.1 shall comply with the relevant requirements of GB 26123-2010 in 5.3.

5.3.2 shall comply with the following requirements.

a) The gas distribution conditions, a special apparatus is provided with oxygen filling pumps, compressors and other film;

b) storage vessels and pipelines dedicated;

c) the conveying pipe is provided with special identifier;

d) storing and transporting more than 25% oxygen concentration Heliox containers and pipes according to a predetermined treatment with oxygen;

e) pumping the heliox film can not pump air compressor;

f) pumping oxygen pneumatic booster pump should be used exclusively.

5.4 Deck decompression chamber

5.4.1 shall comply with the relevant requirements of GB 26123-2010 5.4.

5.4.2 Maximum operating pressure should not be less than the maximum diving depth of pressure.

5.4.3 diver should have treatment gas supply pipes heliox and connected to the cabin BIBS.

5.4.4 should be equipped with a helium voice aligner.

5.4.5 When the need butt and diving bell should be equipped with a docking ring channel and connection card. Dive Control Panel 5.5

5.5.1 should be consistent with GB 26123-2010 relevant requirements of 5.5.

5.5.2 are connected to the mixture gas should have primary air, air supply and air interfaces emergency air supply.

5.5.3 shall be provided with online oxygen analyzer.

5.6 into the water system

5.6.1 present system into effluent standards referred diving cage, open and closed diving bell diving bell.

5.6.2 diving cage GB 26123-2010 should meet the requirements of

5.6.2 and 5.6.4, should have more than two heliox should Emergency gas cylinders, which can meet the volume requirements of the divers stay 30min maximum diving depth. It should also be equipped with one or more emergency air cylinders.

5.6.3 open diving bell should meet the relevant requirements GB 26123-2010

5.6.2 and 5.6.5, should have two or more Heliox Emergency gas cylinders, which can meet the volume requirements of the divers stay 30min maximum diving depth. It should also be equipped with an emergency air above gas bottle. With promising diver supply and ventilation in the upper bell Heliox and air supply valve.

5.8 Communication System

5.8.1 shall comply with the relevant requirements of GB 26123-2010 in 5.8.

5.8.2 dive diver supervision and communication between the diver preparation should be consistent with the helium voice correction requirements.

5.9 Electrical System Shall comply with the relevant requirements of GB 26123-2010 in 5.9. Equipment and instrumentation

5.10 Shall comply with the relevant requirements of GB 26123-2010 in 5.10.

6 operating procedures required

6.1 scene files Shall comply with the relevant requirements of GB 26123-2010 in 6.1.

6.2 Emergency rescue and first aid Shall comply with the relevant requirements of GB 26123-2010 in 6.2.

6.3 formulate plans and contingency plans Shall comply with the relevant requirements of GB 26123-2010 in 6.3.

6.4 Risk assessment and JSA Shall comply with the relevant requirements of GB 26123-2010 in 6.4. With

6.5.1 should be at least eight people, including a diving supervision, a diver, underwater care of a member/diver prepare, prepare a water dive Members, two members of the care, support staff and a life member of a diving electromechanical.

6.5.2 When the daily dives more than once, should be a corresponding increase in staffing.

6.6 Personal protective equipment equipped Shall comply with the relevant requirements of GB 26123-2010 in 6.6.

6.7 with a harness, devices and systems 6.7.1

6.7.3 In GB should meet the minimum diving apparatus equipped with an air 26123-2010 claim, wherein the dry diving suits should be served hot or Water service.

6.8 Preparation and analysis of breathing gas

6.8.1 preparation of mixed gas through the apparatus should be degreased.

6.8.2 helium gas mixture used in the formulation should meet the purity requirements GB 4844.2 first-class product, oxygen should meet the purity 8982 of GB Claim.

6.8.3 diving mixed gas oxygen concentration should be determined according to the diving depth, the oxygen partial pressure should be controlled at 140kPa ~ 160kPa.

6.8.4 diving cage, the oxygen concentration of the diving bell open or closed emergency cylinder gas mixture diving bell should meet the requirements of 6.8.3; divers Individuals carrying emergency oxygen concentration mixture gas cylinders shall be determined according to the maximum diving depth, when the oxygen partial pressure should be controlled not less than the water environment 16kPa, 250kPa not higher than the maximum diving depth. Treated with heliox

6.8.5 should be equipped with an oxygen concentration of at least 20% and 50% of the two.

6.8.6 should be formulated in a mixed gas oxygen concentration analysis, and the analysis should be sampled again after standing 24h, should be re-analyzed before each use.

6.9 With breathing gas

6.9.1 main air divers and emergency air supply should be two independent gas sources in mixture.

6.9.2 preliminary underwater diver the main gas source and emergency air supply should be two separate air mixed gas, the main gas divers wherein the gas source may be an emergency Source instead.

6.9.3 Surface preparation of diver should be independent of the main air and underwater divers divers preliminary supply system. Requirements

6.9.4 should also comply with GB 26123-2010 in 6.8.3 - 6.8.6. Site inspection and test harness 6.10, devices and systems

6.10.1 should be performed in compliance with the relevant requirements 26123-2010 Appendix A of GB .

6.10.2 should also meet the following.

a) the cylinder filling emergency oxygen concentration Heliox

6.8.3 meets the requirements;

b) 8 °C ~ 15 °C temperature when the dry clothes, when the temperature is less than 8 °C hot water service; High-pressure pipes and hoses

c) conveying the gas supply system of an oxygen concentration of more than 25% by Heliox predetermined treated with oxygen;

d) maximum working pressure of the decompression chamber and the maximum diving depth is consistent with the treatment gas supply conduit supplying divers with a helium-oxygen gas mixture, And connected to the cabin BIBS, unobstructed gas, helium with a voice aligner, call clear;

e) divers diving control panel with promising preliminary divers feed gas mixture and the main gas source and emergency air interface, gas and air mixture Gas pipelines can effectively distinguish, smooth supply;

f) The Diving Bell closed one check in accordance with the requirements of 5.6.4, check the structure for deformation, damage, leaks and test its functionality is No normal;

g) closed diving bell dipping one check system according to the requirements of 5.7, check the structure for deformation, damage, leaks, test Its function is normal. 6.11-site communication is established Shall comply with the relevant requirements of GB 26123-2010 in 6.10.

6.23 Gas Conversion

6.23.1 diving depth is less than 80m, the air can be directly converted Heliox in the water.

6.23.2 When diving depth greater than 80m, the air should be converted with heliox between 20m ~ 60m. When

6.23.3 reduced pressure, the conversion by the air Heliox speed should be slow.

6.23.4 complete gas conversion should appear and disappear helium speech marked.

6.24 Decompression program selection

6.24.1 should be based on the diving depth, underwater work time, work in conjunction with diving strength, water quality, and individual differences hydrometeorological divers Variety of factors decompression program.

6.24.2 decompression after diving program should be recognized physician adoption. After the diving schedule 6.25

6.25.1 shall comply with 6.22.1 ~

6.22.3 and 6.22.5 -

6.22.7 of GB 26123-2010 in. After

6.25.2 diver underwater diving decompression or decompression spacewalk water, it should be not less than 2h stay near the deck decompression chamber, and not within 5h Away from the decompression chamber.

6.26 minimum hours of rest Shall comply with the relevant requirements of GB 26123-2010 in 6.23.

6.27 diving accident reports, surveys, statistics and treatment Shall comply with the relevant requirements of GB 26123-2010 in 6.24.