MH/T 1064.5-2017Safety code of power working with the helicopter. Part 5-Hot washing operation (English PDF)

4.1 Personnel

4.1.1 The captain of the helicopter carrying out the electric water flushing operation shall meet the following requirements.

--Have experience in helicopter external load operations;

--Not less than 2 000 h for helicopters;

--Long time of operation model not less than 100 h;

--At least 100 hours of low-altitude flight experience, including electric power operation flight experience;

--Not less than 30 h of flight training time for flushing with electrified water.

4.1.2 The on-board personnel performing the helicopter live water flushing operation shall meet the following requirements.

-Good health, no physical and psychological obstacles that hinder the operation of charged water washing;

--Have basic knowledge of power transmission lines, master the basic principles and operating methods of live work;

--Familiar with the scope of application and usage of flushing equipment;

--Master the emergency rescue method, electrolysis rescue method and artificial respiration method;

-Pass the theoretical training and operation assessment of the electric power management department, and hold a live working certificate;

--Verification of live-water flushing method and operation assessment of flushing personnel. Refer to Appendix A for the assessment method.

4.1.3 The person in charge of work (or safety guardian) shall meet the following requirements.

--Have more than 3 years of actual working experience in live work on transmission lines, be familiar with equipment conditions, have certain organizational capabilities and accident handling Management ability-Pass the relevant theoretical training and operation assessment.

4.2 Equipment

4.2.1 Helicopter

4.2.1.1 The water gun should be installed on the front driver side of the rear of the helicopter, and tools and equipment such as water pumps and motors should be installed on the first passenger side of the helicopter.

Side to balance the helicopter's load.

4.2.1.2 An anti-falling device for personnel and tools should be installed in the engine room to waterproof and wash the operators and tools that fall due to the swing of the helicopter.

drop.

4.2.1.3 The electrical and electronic equipment of the helicopter used for operation shall be able to maintain normal operation under the corresponding strong electric field and strong magnetic field environment.

4.2.2 Flushing device

4.2.2.1 Basic requirements

4.2.2.1.1 The flushing device should have a product qualification certificate and related technical documents. The components and sub-components should meet the relevant standards or pass the necessary test.

4.2.2.1.2 The sum of the weight of the flushing device and the maximum load shall not exceed the design load of the helicopter structure.

4.2.2.1.3 The airworthiness permit should be obtained before the flushing device is installed, and the equipment should be installed in accordance with the requirements and methods of the technical documents.

4.2.2.1.4 After the flushing device is installed, it should not have a serious impact on the aerodynamic characteristics of the helicopter, and should not have an impact on the control performance of the helicopter.

4.2.2.2 Water pump

4.2.2.2.1 There should be control equipment such as voltage stabilization, pressure regulation, control valves and pressure gauges.

4.2.2.2.2 The electrical connectors should be connected reliably and secured.

4.2.2.2.3 Cables and hydraulic conduits should be fixed nearby with flexible binding such as nylon ties.

4.2.2.3 Water gun

4.2.2.3.1 The spray boom should be made of insulating materials.

4.2.2.3.2 The water-passing parts should be able to withstand the discharge pressure of the matching water pump.

4.2.2.3.3 The shape and internal surface roughness of the nozzle should meet the requirements of the length of the water column and the dense water flow, and generally use rust-resistant metal materials Materials or engineering plastics. Under the actual operating pressure, the jetted water column should be straight within the specified length.

4.2.2.3.4 The switching device of the control valve should be sensitive and reliable.

4.2.2.3.5 The control valve should have a bypass pipeline or install a pressure relief valve to prevent the pipeline pressure from being too high after the valve is closed.

4.2.2.3.6 It should be installed on the special fixed frame on the left side of the engine room, and ensure that the operation is always on this side.

4.2.2.4 Diversion pipe

4.2.2.4.1 The surface should be smooth, flat and free of bubbles and cracks.

4.2.2.4.2 The connection with the water gun and the water storage container should be firm without looseness or water leakage.

4.2.2.4.3 It should be able to withstand 1.2 times the rated drainage pressure of the supporting water pump without obvious diameter expansion or leakage.

4.2.2.5 Water storage container

4.2.2.5.1 It should be made of materials that do not affect the water resistivity, and have a water level monitoring device.

4.2.2.5.2 It should be installed at the designed position, generally near the center of gravity of the helicopter.

4.2.2.5.3 It shall meet the requirements for water filling on the ground without stopping the engine.

4.2.2.5.4 Should bring self-sealing device.

4.2.2.5.5 Pipes should be far away from power lines and electrical switches.

4.2.2.6 Water purification equipment

4.2.2.6.1 Generally, a two-stage reverse osmosis device is used for water purification, and an ion exchange device is installed when necessary.

4.2.2.6.2 Portable resistivity testing equipment should be equipped. If equipped with conductivity test equipment, the converted resistivity should conform to GB/T 13395 Requirements for the water quality of electrified water washing operations.

4.3 Rinsing water quality with electrified water

4.3.1 The water used for washing the insulators with electrified water should be of good quality, free of dirt and impurities, and free of acidic, alkaline and salt substances.

4.3.2 Before each flushing operation, the resistivity test equipment should be used to measure the water resistivity, and the water sample should be taken from the outlet of the water gun to measure the water resistivity get on. Such as water tankers and other containers containing water, the water resistivity of each vehicle should be measured.

4.3.3 The resistivity of flushing water should reach 1×105 ohm·cm or more.

4.4 Operating environment and weather

4.4.1 The flushing operation with electrified water should be carried out in good weather conditions. Flushing operations should not be performed under gusty conditions. Should not enter when it rains Rinse with electricity.

4.4.2 The operation team should continuously monitor the weather conditions to ensure that the helicopter maneuverability is not affected. The weather conditions should always be consistent with the helicopter flight.

Permit requirements, and can ensure the stability of the working platform of the water washing operator.

4.4.3 The downwind wind speed should not exceed 5 m/s, the crosswind wind speed should not exceed 3 m/s, and the visibility should not be less than 3 km.

4.4.4 Wind speed and wind direction should not affect the effectiveness of the helicopter's tail rotor in hovering state (that is, the maneuverability will not be affected), and should not affect the water jet direction.

4.4.5 The weather conditions of different tower locations should be evaluated.

4.4.6 The hot water washing operation of the helicopter should be carried out in the dry season in late winter and early spring.

4.4.7 The operation day should be carried out when the wind speed is relatively low between noon and the afternoon before sunset.

4.5 Personnel safety protection

4.5.1 During the operation of energized water washing, the water washing operator and the captain should wear protective equipment to prevent the operator from being affected by the electric field.

4.5.2 No other clothing should be worn outside the shielding suit.

4.6 Personnel fatigue prevention measures

4.6.1 When the driver and the water washing operator notice signs of fatigue in themselves or the other party, they should immediately stop the water washing operation.

4.6.2 If the electrified water flushing operation continues for more than 2 hours, the unit should stop the operation and rest for at least 20 minutes.

4.6.3 The working hours of the crew should not exceed 14 hours throughout the day.

4.6.4 During any continuous 24 hours, the accumulated flight time should not exceed 5 hours.

4.6.5 Within 7 consecutive days, the accumulated flight time should not exceed 35 hours.

4.6.6 In a calendar month, the accumulated flight time should not exceed 120 hours.

6.1 Preparation stage

6.1.1 The operation unit of the electric water flushing operation shall prepare the operation plan, which shall be reviewed and approved by the transmission line management department, and shall go through the relevant procedures in accordance with the regulations.

6.1.2 The person in charge of the work shall summon all the operators to make a safety technical briefing, and clarify the safety matters that should be paid attention to at the work site.

6.1.3 Before the live water flushing unit enters the site for operation, the site should be surveyed in advance, familiar with the line environment, and understand the weather and line on the working day.

Road insulator operation.

6.1.4 Check helicopters, safety tools, protective equipment, and flushing water.

6.1.5 The crew should master the tower position coordinates of the operation route in advance and mark them in the operation task list.

6.1.6 A suitable water source should be selected in advance near the take-off and landing point, and a container of suitable capacity and material should be selected for the flushing water. Unit should be equipped Prepare suitable ground vehicles for transporting flushing water.

6.2 Direct preparation phase

6.2.1 Helicopter pre-flight inspection

6.2.1.1 It should be checked whether the communication system is working normally.

6.2.1.2 Check whether the engine switch of the water pump works normally.

6.2.1.3 Check whether the safety belt and shoulder strap of the boom operator are firm and properly connected.

6.2.1.4 It should be ensured that there are no loose parts in the cabin area.

6.2.1.5 Check whether the clamp plate is installed in the hook.

6.2.1.6 It is to be ensured that the pilot weight or the front ballast provides a margin of 10 kg.

6.2.2 Pre-flight inspection of flushing device

6.2.2.1 The connection and fixing status of the water storage container, water diversion pipe and water gun joints shall be checked to prevent leakage of the water diversion pipe and joints, and prevent flushing.

The reaction force causes the water pipe to swing and may affect the operation of power transmission equipment.

6.2.2.2 Check and adjust the pump pressure and water column range. When testing the water, keep the muzzle away from personnel and equipment.

6.2.2.3 The water resistivity at the outlet of the water gun shall be tested and recorded.

6.2.2.4 The flushing device shall be carried out on the ground. Fill the medicine box with more than 1/2 payload of clean water, and ignite according to the requirements of the local interview vehicle.

Open the spray control valve and observe whether the nozzle is clogged or delayed; close the spray control valve and observe whether the nozzle is dripping.

6.2.3 Flushing platform pre-flight inspection

6.2.3.1 Check whether the boom is installed in the fixed block.

6.2.3.2 Check whether there are dents, cracks, faults, etc. in the outer space of the boom.

6.2.3.3 Check whether the frame is broken or whether it is bent in the fixed area.

6.2.3.4 Check whether the bolts holding the frame or the fixing bolts fixing the pump, motor and frame to the helicopter are loose.

6.2.3.5 Check whether the boom can move freely.

6.2.3.6 Check whether the rear boom restraint and front locking device are firm and complete.

6.2.4 Inspection of flushing water

6.2.4.1 It is to be ensured that the flushing water is tested for resistivity (or conductivity) before being injected into the helicopter water tank. See Appendix B for the test record form.

6.2.4.2 It should be ensured that the resistivity of the flushing water reaches 1×105 ohm-cm or more.

6.2.5 Other preparations

6.2.5.1 The person in charge of the electric water flushing operation should contact the line operation management unit before the start of the work, and can only start the work after agreeing.

If necessary, you can submit a pressure reduction application to the line operation management unit before the formal operation, and perform the operation after the line pressure is reduced.

6.2.5.2 The person in charge of work shall confirm that the automatic reclosing device is disabled before issuing a work ticket for live work on the power line. After the work is over Report to the line operation management unit in time.

6.2.5.3 The crew should understand the flight dynamics of the flight area and obtain the latest aeronautical information, communications and navigation data.

6.2.5.4 The flight crew shall go through relevant procedures such as the flight mission statement and the flight release form.

7.1 Flight

7.1.1 When adjusting the aircraft and flying over the line, the direction of the spray rod should always be parallel to the helicopter body, and ensure that the nozzle of the water gun is aligned with the nose of the helicopter.

The direction is the same.

7.1.2 Water washing operators should sit forward and wear safety belts during takeoff and landing.

7.1.3 The water washing operator shall notify the driver before releasing or locking the spray rod from the installation position. Use "loose lever" or "lock" when communicating "Pole" and other terms.

7.1.4 Water washing operators should wear safety shoulder belts at all times and ensure that the safety shoulder belts are fastened firmly to the safety belts in the engine room.

7.1.5 When the helicopter needs to fly over the line, it should exit the line first and fly at an altitude higher than the flushed line.

7.1.6 The helicopter should always move on the side of the line and ensure that the line is always within visual range.

7.1.7 The driver should bypass and enter the line during each operation, and ensure that the side of the line is always on the driver's side.

7.1.8 When adjusting the position of the helicopter, the captain should have fully understood the obstacles under and around the helicopter.

7.2 Approach

7.2.1 When the helicopter is approaching the tower, the water gun should extend out of the rotor.

7.2.2 When the helicopter approaches the insulator string to be washed according to the washing operation requirements, the following operations shall be carried out.

--Check the remaining power;

--Check maneuverability/efficiency of tail rotor;

--Check engine temperature and pressure, warning lights;

--The aircraft is hovering and trimming.

7.3 Flushing

7.3.1 When flushing, pay attention to monitor the water level of the water storage container, and ensure that the water consumption is sufficient when flushing a single insulator string, so as not to cause the equipment to start.

Arc and even flashover.

7.3.2 Arcing should be avoided during washing, or the degree of arcing should be reduced.

7.3.3 Pay attention to the wind direction when washing, first wash the downwind side insulators and then wash the upwind side insulators. The flushing water column should be consistent with the wind direction, Do not work against the wind. During the flushing process, attention should be paid to changes in wind direction and wind speed, and timely adjustments should be made or flushing should be suspended.

7.3.4 Before flushing, the distance and orientation of the water gun, flushing device and the insulator string to be flushed and adjacent insulator strings should be checked. The length of the water column should be different.

Less than 5 m, the distance between the water gun, flushing device and personnel and the insulator string to be washed and the adjacent insulator string should meet GB 26859 and GB 26860 for the specified safety distance, the relationship between the length of the water column and the voltage, see Appendix C.

7.3.5 Uniform passwords and gestures should be used between the operator and the driver for flushing with electric water. For commands and gestures for flushing with electricity, see Appendix D.

7.3.6 It should be ensured that the helicopter and the live conductor or grounding body always maintain a sufficient safety distance. For the safety distance, please refer to the relevant information in GB 26859.

The regulations are implemented, and the helicopter itself has been considered.

7.3.7 Before moving the helicopter for flushing, the pilot should visually check the direction of the spray boom.

7.3.8 Different color tapes can be used on the boom to mark the radius of the blade when the boom is parallel and perpendicular to the fuselage, which is convenient for the driver to judge the propeller.

Leaf position.

7.4 Work safety

7.4.1 When relocating to the other side of the same tower, fly over from the top of the tower and reconfirm the trim.

7.4.2 Emergency plans for dealing with engine failures should be prepared in advance.

7.4.3 Clear and concise conversations should be maintained between crew members.

7.4.4 If the crew members feel physical tingling or muscle cramps, they should stop their operations immediately.

7.4.5 For pole towers with a rotation angle greater than 30°, the insulator string on the inside of the rotation angle is not suitable for helicopter water washing operations.

7.4.6 If the machine head needs to hover against the wire, the ground wire and the wire should be monitored.

7.4.7 The minimum flight permit between parallel towers should be observed.

7.4.8 Water flushing operations should not be carried out in densely populated and crowded areas.

7.4.9 In the event of a circuit flashover trip or abnormal accident, the unit should immediately stop the operation, and the person in charge of the work should report to the line operation management unit Announce the situation.

7.4.10 In the event of a circuit flashover trip or abnormal accident, the line operation management unit shall find out the cause and ensure the safety of the helicopter.

Then resume charging. The unit shall verify with the line operation management unit and obtain approval before continuing operation.