GB 16636-2008Code of safety for diver's use of electricity underwater (English PDF)

4.1 Deck cabin decompression and emergency transport systems

4.1.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa, and can change at different rates.

4.1.2 Environment. 0MPa ~ 0.6MPa compressed air; or an oxygen partial pressure of not more than 0.06MPa and an oxygen concentration of not more than 23% oxygen Mixture.

4.1.3 Temperature. saturated cabin is 25 °C ~ 35 °C, cabin air is 0 °C ~ 50 °C.

4.1.4 Humidity. cabin relative humidity of 50% to 75%, under special circumstances, a brief rise to 100%.

4.1.5 diver dress. wearing thin non-electrical protection clothing.

4.2 The Diving Bell and provided guillotine submersible

4.2.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa, and rapidly changing.

4.2.2 Environment. 0MPa ~ 0.6MPa compressed air; or an oxygen partial pressure of not more than 0.06MPa and an oxygen concentration of not more than 23% oxygen Mixture.

4.2.3 Temperature. inner equipment for 25 °C ~ 35 °C, special cases can be reduced to 10 °C. External at 0 °C ~ 30 °C, but is usually at 5 °C ~ 15 °C.

4.2.4 Humidity. high relative humidity inside the device, external exposure to seawater splash zones, and it can be submerged.

4.2.5 diver dress. wearing thin non-electrical protection clothing.

4.3 Underwater working spaces

4.3.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa.

4.3.2 Environment. 0MPa ~ 0.6MPa compressed air; or an oxygen partial pressure of not more than 0.06MPa and an oxygen concentration of not more than 23% oxygen Mixture.

4.3.3 temperature. Internal temperature 5 °C ~ 40 °C, if in a very small cabin, the temperature can rise to special circumstances 60 °C.

4.3.4 Humidity. fully submerged in the water under the outside pressure. During operation, a relative humidity of 70% to 100%.

4.3.5 Diver Dress. Wear rubber wetsuit, conventional heat welding clothes or clothes.

4.4 Electric wetsuit

4.4.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa, does not change rapidly.

4.4.2 Environment. When the diver enters or leaves the diving bell, the environment is 0MPa ~ 0.6MPa compressed air; or an oxygen partial pressure of not more than 0.06MPa and an oxygen concentration of not more than 23% of the oxygen-containing gas mixture. In support of the water diving, the diver enters or leaves the table ocean When the surface, atmospheric pressure environment.

4.4.3 temperature. depend on the depth of which the water temperature, usually at 5 °C ~ 15 °C.

4.4.4 Humidity. the external environment is usually water.

4.4.5 Diver Dress. Wear rubber wetsuit.

4.5 Manned submersible

4.5.1 pressure. internal pressure remains in the atmospheric environment, the external pressure depending on the depth of the job.

4.5.2 environment. an oxygen partial pressure of not more than 0.06MPa and an oxygen concentration of not more than 23% of the oxygen-containing gas mixture.

4.5.3 Temperature. The internal temperature of 10 °C ~ 25 °C, 2 °C can temporarily lowered or raised to 35 °C. The exterior is of deep seawater temperature, That is 0 °C ~ 30 °C.

4.5.4 Humidity. cabins, relative humidity is high; EVA, from the atmosphere (splash or immersion zone) to the sea.

4.5.5 Diver Dress. wear ordinary clothing or rubber diving suit.

4.6 ROV

4.6.1 Pressure. Once fully into the water, the external pressure is the pressure of the surrounding water environment. The pressure in the submersible launching or recovery , It will quickly change.

4.6.2 Environment. the device is fully submerged in seawater.

4.6.3 Temperature. Water temperature changes from 0 °C ~ 30 °C.

4.6.4 Humidity. external environment is water.

4.6.5 Diver Dress. Wear rubber wetsuit.

4.7 Umbilical cord

4.7.1 pressure. pressure depends on water depth, the range 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa. Pressure change rapid.

4.7.2 environment. air, mist or splashing water.

4.7.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, special circumstances may be less than 0 °C or up to 50 °C.

4.7.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.7.5 Diver Dress. Wear rubber wetsuit.

4.8 Handheld devices

4.8.1 pressure. depending on water depth pressure range 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa. Pressure change rapid.

4.8.2 environment. air, splash or completely submerged in the sea fog, you can also enter 0.6MPa compressed air or helium pressure of 6MPa Oxygen gas mixture environment.

4.8.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, but is generally 5 °C ~ 15 °C.

4.8.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.8.5 Diver Dress. Wear rubber wetsuit.

4.9 Subsea equipment

4.9.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa.

4.9.2 environment. air, mist or splashing water.

4.9.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, but is generally 5 °C ~ 15 °C.

4.9.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.9.5 Diver Dress. Wear rubber wetsuit.

4.10 Wet Welding and Cutting

4.10.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa.

4.10.2 Setting. atmospheric, mist or splashing water.

4.10.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, but is generally 5 °C ~ 15 °C.

4.10.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.10.5 Diver Dress. Wear rubber wetsuit or heavy diving suit, helmet wrap a thin rubber or insulating film, wear rubber gloves.

4.11 Plus current device

4.11.1 Pressure. 0MPa ~ 3MPa.

4.11.2 Setting. atmospheric, mist or splashing water.

4.11.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, but is generally 5 °C ~ 15 °C.

4.11.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.11.5 Diver Dress. Wear rubber wetsuit.

4.12 Power equipment

4.12.1 Pressure. 0MPa ~ 3MPa.

4.12.2 Setting. atmospheric, mist or splashing water.

4.12.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, but is generally 5 °C ~ 15 °C.

4.12.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.12.5 Diver Dress. Wear rubber wetsuit.

4.13 Water distribution equipment

4.13.1 Pressure. atmospheric environment.

4.13.2 Setting. from dry, warm air-conditioned room conditions until the exposed deck of the ship (wind, rain, waves and vibration).

4.13.3 Temperature. depends on the temperature of their environment, usually in the 0 °C ~ 50 °C.

4.13.4 Humidity. from dry atmosphere until the splash zone.

4.13.5 Diver Dress. wear ordinary clothing or rubber diving suit.

4.14 Underwater explosive device

4.14.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa.

4.14.2 Setting. atmospheric, mist or splashing water.

4.14.3 Temperature. immersion in seawater at a temperature of 0 °C ~ 30 °C, but is generally 5 °C ~ 15 °C.

4.14.4 Humidity. from the atmosphere (splash or immersion zone) to the sea.

4.14.5 Diver Dress. Wear rubber wetsuit.

4.15 Battery

4.15.1 Pressure. atmospheric environment.

4.15.2 Setting. completely watertight.

4.15.3 Temperature. depends on the temperature of their environment, typically 0 °C ~ 50 °C.

4.15.4 Humidity. dry.

4.15.5 Diver Dress. wear ordinary clothing or rubber diving suit.

4.16 Insulation Materials

4.16.1 Pressure. 0MPa ~ 6MPa, but generally 0MPa ~ 3MPa, and can change at different rates.

4.16.2 Setting. from dry, warm air-conditioned room conditions until the exposed deck of the ship (wind, rain, waves and vibration).

4.16.3 Temperature. depends on the temperature of their environment, typically 0 °C ~ 50 °C.

4.16.4 Humidity. from dry atmosphere until the splash zone.

4.16.5 Diver Dress. wear ordinary clothing or rubber diving suit.

5.3 The Diving Bell and provided guillotine submersible

5.3.1 The Diving Bell and provided guillotine submersible electric voltage, should meet the requirements of Table 1.

5.3.2 Diving bell inside the clock power for 24V DC power supply by the diving bell mounted on the outer surface of the water pressure vessel and the rectifier transformer power supply provide. 220V AC

5.3.3 for diving bell exterior lighting shall have a current limit fault isolation transformer and residual current protection Active Protection System device (RCD) is constituted to provide power protection.

5.4 Underwater working spaces

5.4.1 underwater work spaces voltage electricity, should meet the requirements of Table 1.

5.4.2 cabin working power (eg. preheat power and portable power tools, etc.) should be carried out on-line monitoring through wire insulation monitor.

5.4.3 tank umbilical cable insulation resistance should continuously monitor the situation through the wire insulation monitor. Wire insulation monitor can be monitored via the drain Resistance, and provides continuous readings to monitor changes in the circuit insulation.

5.5 Manned submersible

5.5.1 manned submersible electric voltage electrical equipment facility shall comply with the requirements of Table 1. The cockpit is not greater than the DC supply only 24V power for life support and control circuits.

5.5.2 Place the transformer and rectifier power supply for treatment submersible vessel loop and control equipment, should be placed outside the submersible.

5.6 ROV

5.6.1 ROV use of AC power by 380V (440V) transformer three-phase AC power supply system of the ship and through the umbilical cord electric Cable through the isolation transformer provides.

5.6.2 ROV and diver joint operations, should take appropriate safety measures, such as. diver should wear a full wetsuit anti-power Conduct operations.

5.7 Umbilical cord

5.7.1 umbilical cable should have sufficient tensile strength, while measures should be taken so that it does not withstand tensile loads.

5.7.2 umbilical cord may be external voltage electricity diver or related personnel touch electrical equipment shall comply with the requirements given in Table 1.

5.7.3 The umbilical cable protective measures should take the initiative, and the power line access is provided on the surface of the isolation transformer.

5.8 Handheld devices

5.8.1 diver portable equipment should be durable, reliable insulation. Power Voltage

5.8.2 diver handheld devices shall comply with the requirements given in Table 1.

5.9 Subsea equipment

5.9.1 High-power subsea equipment (such as. the suction dredging pump), power to the motor through the umbilical cord from the surface of 380V (440V) for three-phase AC Electrical system, ensure insulation and a grounded shield performance of the primary umbilical cable to the motor connector.

5.9.2 Auxiliary equipment subsea operations divers should wear insulated gloves and take appropriate safety measures.

5.10 Electric wetsuit

5.10.1 wetsuit electric resistance wire should have high fatigue strength, and the structure is solid and difficult to break. And electric insulating wetsuit Conductive fabric should be fire-retardant, high temperature, non-toxic materials.

5.10.2 electric wetsuit voltage electricity, should meet the requirements given in Table 2. Table 2 condition Current human security / mA Impedance current path / Voltage/ Maximum rated AC automatic tripping device Automatic trip device DC DC without automatic tripping device 22.8

5.10.3 diving suit helmet electric or gas heater, should be completely enclosed within a conductive shield grounded. Before electric

5.10.4 diver wearing a diving suit diving operations, respond to an electric circuit wetsuit and rigorous visual inspection and Electrical safety testing, safety performance test failure shall not be used.

5.11 Wet Welding and Cutting Power Voltage

5.11.1 wet welding and cutting equipment shall comply with the provisions given in Table 3. Table 3 condition Current human security / mA Impedance current path / Voltage/ Maximum rated DC without automatic tripping device 407,503,024

5.11.2 electric oxygen cutting device should meet the following conditions.

a) electrical aerobic oxygen torch valve should be designed, the valve should always make sure that the cut strip insulation.

b) cut Article shall have an electrically insulating layer; the electrically insulating layer should have a high abrasion resistance, and will not long-term immersion in seawater Which led to the deterioration of insulation properties.

5.12 Plus current device

5.12.1 impressed current system should be set up isolation cover bar and/or safety signs at a distance from their proper order to avoid straying into potential diver Regional hazards. Isolation cover bar and/or calculate the safety distance of safety signs can refer to Appendix B.

5.12.2 electric voltage impressed current devices shall comply with the requirements given in Table 3. And should take appropriate protective measures to prevent the applied electrical Flow device system is polarized. DC supply voltage

5.12.3 impressed current system is not more than 30V, not to set the isolation cover bar and safety signs. Underwater divers work under

5.12.4 should be possible in the case of cutting impressed current device system power supply, or should be first detected Electric field strength near the waters, and take appropriate protective measures can be carried out underwater operations.

5.13 Power equipment

5.13.1 powered devices should be an appropriate distance from its isolation set cover bar and/or safety signs to avoid straying into potentially dangerous diver Damage area. Isolation cover bar and/or calculate the safety distance of safety signs can refer to Appendix B.

5.13.2 Before diving operations begin to deal with power supply equipment to conduct a detailed inquiry, investigation and assessment of possible hazards, And propose necessary security measures.

5.13.3 In existing power supply of high-power devices can not be interrupted job situation, deal with job divers take the necessary protection against electric shock Protection, to protect the safety of diving operations.

6.1 Underwater electricity installation requirements

6.1.1 concerning engage diver underwater diving equipment, electrical systems, tools and facilities of underwater structures facilities installation, renovation and maintenance Repair personnel, should be proficient in electrical operating procedures, familiar with danger and problems of underwater engineering practice of holding national accreditation certificates and familiar country Professionals and family with the relevant provisions of the standards for content. Before installing and underwater divers about a variety of electrical facilities, equipment, or temporary electrical equipment 6.1.2, you should first check, make sure These electrical facilities, installations or equipment has reached the current relevant state regulations and requirements of this standard.

6.1.3 Installation and diver underwater operations related to a variety of diving equipment, systems, tools, underwater structures and facilities of electrical facilities should follow The following points.

a) all greater than 6V electrical circuit should have the appropriate fuse/circuit breaker for the short circuit protection;

b) through the electrical wires should have a full load current, overload current and fault current protection device may adopt internal action time Sufficient cross-sectional area;

c) electrical circuit connector should be reliable, and try to reduce their number; should complete the electrical connection terminal structure, and having a length Wire pigtail;

d) wire routing should avoid prone to mechanical damage and place to be fixed, if necessary, be some form of mechanical protection;

e) electrical circuit wiring should be separated to avoid cross-circuit or damage caused by a short circuit; Terminal box

f) electrical lines should be sealed to prevent moisture intrusion;

g) shall not use the shared fee...