Welcome to: Professional Frogman Underwater Detection Camera Company
The underwater detection camera of the tunnel shows that diving into the tunnel belongs to the category of tunnel diving in the diving operation. The diving operation itself has certain dangers. The danger of tunnel diving is higher. What is needed is that the divers have rich diving experience, calm and clear minds, and a complete set of skilled diving teams. The precautions of tunnel diving are as follows:
1. There is no light source, and there is no light source in the cave, so divers can only judge the direction by their own diving flashlight and towing rope.
2. Easy to get lost Divers are easy to get lost due to the clarity of the water body and long-term underwater operations, which lead to confusion of direction.
3. There is a risk of being entangled. The bigger factor in the danger of hole diving is entangled by the old underwater ropes, fishing nets, water plants, old wires and other sundries, resulting in inability to move forward.
4. It is impossible to escape quickly. If a diver encounters an emergency, he or she cannot escape quickly. Unlike ordinary divers, cave divers do not surface directly and can only return by the same way, which greatly increases the danger of diving operations, such as on the way back. Insufficient oxygen and inability to breathe.
Therefore, the safety plan for cave diving should be more adequate than that for general diving operations, and the spare equipment should be sufficient, so that they can face sudden accidents calmly and handle special situations with ease. Therefore, the divers for cave diving must be experienced and have higher psychological quality than ordinary people. The following is our company's Dongqian case for your reference.
Gansu jade door The Shulehe River Tunnel is about 478m long and 35m deep, with gas transmission from oil companies on both sides of the tunnel The Conduit The purpose of this tunnel diving is to detect the pipeline body, anti-corrosion coating, joint coating, pipe clamp and buttress in the tunnel and carry out integrated inspection, and record the whole detection process in the form of underwater camera.
Shulehe Tunnel of West East Gas Pipeline 3 is a good water injection operation tunnel within the jurisdiction of the branch company, and no inspection has been carried out since its construction in 2013. To avoid hanging and fixing pipe clamps in tunnels of the same type Nut In recent days, Jiuquan Oil and Gas Transportation Company has hired a professional team to dive into the tunnel for the first time to carry out an integrated inspection of the tunnel body, pipeline body, anti-corrosion coating, joint coating, pipe clamp and buttress.
The company attaches great importance to the initial diving operation, discusses safety guarantee measures with divers one day in advance, checks the qualification of personnel and equipment allocation, consults with professional teams to check the potential risks of diving operation, and consults the standard to develop the Shule River Umbilical Diving Operation Safety Checklist. Before diving, check the diving helmet, communication facilities and emergency one by one according to the table Gas cylinder Emergency diver equipment and first-aid ability level. During diving, the pressure of gas supply and distribution panel was monitored, the signal rope was sent and released, and the diving personnel were depressurized to ensure the safety of personnel during the rectification operation.
Arrange and deploy security measures
In order to ensure the quality of the operation and ensure the one-time success of the diving operation, before the operation, the branch company carried out a one-day pipeline training for the divers to thoroughly explain the principle of pipeline corrosion prevention, the role of pipe clamps and buttresses, and the inspection standards of joint coating tape. The branch company has made requirements for the key points of diving detection, the handheld way of recorders, and the shooting time of suspected defects, be launched The former branch company used the ground pipeline to prepare the simulated shooting for the divers, and required the divers to retell the key points of the detection, which ensured the quality of the diving shooting.
During the initial diving operation, we encountered some emergencies and accumulated a lot of experience in dealing with them. For example, the diving time was better from 2:00 p.m. to 5:00 p.m., the divers were better to stay in shallow water for a short time before the formal diving operation, and the signal and emergency rope were slightly faster than the gas supply pipe. After the operation, the branch company and the construction team prepared a special docking meeting, Carefully sort out the problems encountered and the handling methods to ensure the accumulation, summary and inheritance of experience.
This diving operation provides a strong basis for assessing the current situation of the pipeline in the Shule River Tunnel. In the later stage, the branch will continue to prepare for diving detection and pumping detection as appropriate to identify hidden dangers, reduce risks and ensure the intrinsic safety of the pipeline.
Underwater photography is different from land photography. Frogman needs to pay attention to aperture f/8, shutter, iso, Focus, the underwater light is insufficient. Under normal circumstances, the flash light needs to be artificially supplemented. The high level is deep, and the light is very dark, so the power of the flash light needs to be increased. At present, the underwater focus of the commonly used diver underwater television system is mostly controlled by the surface console. During underwater shooting, the operator of the surface console must focus on the image on the device. When moving the position, the operator must first quickly judge whether the shooting distance is getting closer or farther, and then quickly manipulate the focus switch to focus according to the speed of distance change. When the shooting distance changes slowly, the focus can be adjusted by "inching". When the change is fast, the focus can be adjusted by "linking". When divers operate underwater, they should pay attention to the cooperation with the water surface. They should try to keep a relatively stable shooting distance, and do not let the console operators cannot focus.
I Equipment and personnel for underwater detection:
A. Equipment (1) light diving equipment km28; (2) Two 0.35 cubic air compressors; (3) Two sets of underwater interphone systems; (4) Two medical oxygen bottles; (5) One underwater camera.
B. Three divers; 2. Two diving assistants; 3. One on-site principal 4. One safety officer
2、 Preparatory work
1. Commissioning and inspection shall be carried out before commissioning of the diving air compressor, diving equipment, underwater walkie talkie and underwater camera used on site, and the equipment used shall be subject to good performance.
2. The oxygen meter filler pipe for medical oxygen is connected to the air compressor and used as an emergency gas source;
3. The divers should wear diving equipment, adjust the intercom system, and use professional equipment to measure the approximate depth of water
4. The diver takes the underwater camera for underwater exploration, reports the underwater situation through the walkie talkie, and records it with the camera.
5. The person in charge of the site completes the exploration report and provides data.
3、 Safety measures
1. The ventilated heavy diving operation group shall be composed of four persons for each group of diving operation, and shall be equipped with a full set of emergency diving equipment and rescue divers; The double group diving operation can be composed of eight people, but not less than seven people. Diving operation outside the base must be capable of diving in two groups at the same time.
2. Divers, line operators, telephone operators, and diving hose operators (pipe pullers) must be operated by formal diving operators, and no one is allowed to replace them (see the responsibilities of personnel at all posts in the diving operation team).
3. Before diving operation, the water depth, flow rate, water temperature and impurities in the pipeline at the operation site shall be understood and carefully filled in the diving log.
4. According to the underwater operation content and workload, combined with the impurities in the pipeline at the operation site, carefully analyze various situations that may be encountered in the diving operation, and develop the diving operation plan and emergency safety guarantee measures.
5. When the diving operation starts, fence devices shall be set around the diving operation; Signal lights shall be hung for night work, and sufficient working lighting shall be provided.
6. Diving operators must be familiar with the regulations on the use of signal ropes and the contact signals agreed in advance. In particular, the signal rope must be tied for operations in deep water, current surge, pipelines and reservoirs, so that in case of telephone failure, the signal rope can be used to transmit signals.
7. When two or more groups of diving operators are working at the same working face, they should always check their respective gas supply hoses and signal ropes to prevent intertwining.
8. The messenger and pipe puller must always observe the tightness of the signal rope and gas supply hose, and ask about the underwater operation at any time to prevent accidents. When two groups of divers work at the same time, the diver who finishes the task first must wait on the diving ladder after coming out of the water, and the diving gear can be unloaded after the other diver comes out of the water.
9. Tools and objects required for underwater operation shall be sent and received, and throwing is strictly prohibited. Divers are not allowed to carry heavy objects to rise out of the water.
10. The floating or heavy rubber hose can be selected according to the working environment. Floating rubber hose shall be adopted in underwater installation and removal works; Heavy rubber hose should be used when working in culverts, dams or areas with deep water and large flow velocity.
11. The diving equipment shall be kept and used in archives. Diving suits and gas supply hoses shall be regularly inspected, cleaned and disinfected. Those failing to meet the safety strength requirements shall be scrapped and out of service.
12. The oil-water separator in the gas supply equipment shall be drained in time and cleaned regularly according to the service time; The activated carbon or other substitutes in the air filter should also be replaced or cleaned regularly according to the use condition.
13. When diving outside, there must be written instructions from production scheduling and written safety technical disclosure prepared by technicians for the work, and the work can only be carried out after the purpose of the work is clear.
14. The diver needs to depressurize according to the pressure relief table when leaving the water.
Our company has learned from the experience and lessons of several domestic diving companies in terms of operation. The purpose of the company is based on customers and honesty. The company has a strong technical force and advanced and complete underwater construction equipment, which ensures that the company provides customers with integrated high-quality and affordable services. The company has: Grade I safety construction qualification, Grade II diving engineering construction qualification, diving construction personnel holding the Diving Operation Certificate issued by the China Salvage Industry Association, and all of them have taken part in life insurance, so the construction unit has no worries. Service tenet: adhere to quality, pay attention to reputation, ensure safety, guarantee service life, and pay regular return visits. We sincerely welcome friends from all walks of life to provide valuable suggestions for our company, and earnestly hope to work together with new and old customers and our company to achieve a grand future.
