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MHT1049-2012: Design specification for spraying equipment of aircraft
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Design specification for spraying equipment of aircraft
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MH/T 1049-2012
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Standard similar to MHT1049-2012 MH/T 1059 MH/T 1057 MH/T 1052 Basic data | Standard ID | MH/T 1049-2012 (MH/T1049-2012) | | Description (Translated English) | Design specification for spraying equipment of aircraft | | Sector / Industry | Civil Aviation Industry Standard (Recommended) | | Word Count Estimation | 1,151 | | Date of Issue | 10/10/2012 | | Date of Implementation | 20/12/2012 | | Issuing agency(ies) | Civil Aviation Administration of China | MHT1049-2012: Design specification for spraying equipment of aircraft---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.
Design specification for spraying equipment of aircraft
ICS 65.060
B 90
Civil Aviation Industry Standard of the People's Republic of China
Design specification for aircraft spraying equipment
2012-10-10 released
2012-12-20 Implementation
Issued by Civil Aviation Administration of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Transportation Department of the Civil Aviation Administration of China.
This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China.
This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology.
Drafting organization of this standard. The Second Research Institute of Civil Aviation Administration of China.
The main drafters of this standard. Zhu Chuanyin, Jin Junhao, Ding Wenli, Wang Bingxi, Li Youhe, Zhang Minghui, Zhou Fenge.
Design specification for aircraft spraying equipment
1 Scope
This standard specifies the design, marking, packaging and storage requirements of aircraft spraying equipment.
This standard applies to the design, improvement and acceptance of aircraft spraying equipment.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Spray control valve
A device installed on the main pipe of the spray system to adjust the spray pressure and flow rate.
2.2
Anti-shake baffle
A device used to reduce the violent shaking of the liquid medicine in the liquid medicine tank.
2.3
Wind wheel
The power component that converts the kinetic energy of the wind into the rotating mechanical energy of the liquid pump.
2.4
Anti-drip device
After the liquid flow to the atomizer is cut off, a device that prevents the liquid from flowing out or dripping from the atomizer.
Note. The device is usually installed in the nozzle body.
2.5
Suck-back device
During spraying operation, after the spraying system is closed, a device that uses suction to generate negative pressure in the spray rod to prevent the liquid from being discharged.
2.6
Nozzle
A device that atomizes spray liquid to form mist droplets.
2.7
Rotary atomizer
A device that uses rotational kinetic energy to atomize liquids.
3 Overall design requirements
3.1 The material of spraying equipment should have sufficient strength, rigidity and light weight.
3.2 The spraying equipment should have the capability of constant, low-volume and ultra-low-volume spray operations to suit the spraying requirements of different dosage forms of medicine.
3.3 The design of the spray system should be able to avoid the phenomenon of tailing in the air when the spray control valve is closed during the operation.
3.4 The structure of spraying equipment should be designed reasonably to ensure the safety and convenient operation of operators during assembly, use and maintenance.
3.5 The layout of the spraying equipment on the aircraft should be reasonable, and should usually be installed in the lower part of the fuselage and behind the trailing edge of the wing in order to take advantage of the flight
The downwash airflow generated in the process improves the dispersion and uniformity of the spray liquid.
3.6 The installation of the spray flow and pressure adjustment display device in the cockpit should be convenient for the crew to operate and observe.
3.7 The design of each connection piece of the sprinkler system should be able to avoid loosening and leakage at each connection.
3.8 The parts in contact with pesticides, especially the gaskets in the nozzle and the sealing parts in the chemical pump, should have good corrosion resistance.
3.9 Reliable anti-loosening measures should be taken to prevent the parts such as the atomizer and the drip-proof device from falling off.
4 Nozzle design
4.1 The main body of the nozzle should be made of plastic; the nozzle should be made of ceramic.
4.2 The sprinkler should have a drip-proof device, and the drip-proof device should open and close sensitively and have reliable performance.
4.3 Under normal working pressure, the design of the nozzle should ensure that the spray mist flow is uniform and continuous.
5 Rotating atomizer design
5.1 The brackets and other components of the rotary atomizer should be installed firmly to ensure that they are effective in the expected overload, vibration, mass imbalance and other factors
The next will not be damaged.
5.2 The installation position of the rotary atomizer should be adjusted according to the atomization requirements.
5.3 The rotary atomizer should have an anti-drip device, and the anti-drip device should be sensitive to opening and closing and reliable in performance.
5.4 Rotary atomizer blades should have sufficient strength under the expected limit speed and use environment, and the installation angle should be adjustable, and the position should be adjusted.
The placement should be clearly indicated.
5.5 The flow control valve should have multiple adjustment scales, with correct calibration and clear instructions.
5.6 The two ends of the rotary atomizer hose should have a reliable fastening method. When the interface span exceeds 300 mm, a fixed point should be added in the middle.
6 Design of chemical tank
6.1 The material of the chemical tank should have the characteristics of anti-corrosion, low density, easy repair, etc. Composite materials, stainless steel, etc. should be used.
6.2 The chemical tank should have a device to display the loading capacity or weight, and its installation position should be convenient for the crew to observe.
6.3 The chemical tank should be equipped with a pressure balance device to avoid spraying or spraying due to negative pressure in the chemical tank during spraying or emergency delivery.
Emergency delivery cannot be performed normally.
6.4 The anti-sway partitions should be installed in the longitudinal and transverse directions above the middle part of the chemical tank, and a certain number of partitions should be designed according to the needs.
The diameter of the holes should be 40 mm-50 mm, and the distribution and quantity should ensure that the partition has sufficient strength. For capacity less than 500 L
The liquid medicine tank (except for the flat liquid medicine tank) may not be provided with anti-shake partitions.
6.5 The lid of the chemical tank should be firmly fixed and well sealed.
6.6 The chemical tank should be tested for leakage on the ground to ensure that there is no leakage in its closed area.
6.7 The chemical tank and its installation method should ensure sufficient strength under the maximum maneuver load in all directions of the aircraft.
7 Mixing system design
7.1 The mixing system should be designed in conjunction with the reflux device to simplify the structure of the spraying equipment and reduce its quality.
7.2 When designing the backflow device, select a suitable return port position to prevent the spray liquid from splashing and affecting the stirring effect.
8 Spray system design
8.1 The materials of the liquid pump, spray control valve and pipeline should have the characteristics of anti-corrosion, durability and easy maintenance. Stainless steel, cast aluminum,
Composite materials, etc.
8.2 Flow and pressure adjustment devices should be set up and ensure that they are easy to adjust and work stably.
8.3 When the working pressure of the spray system is not greater than 0.2 MPa, a suction device should be installed in the spray equipment.
8.4 A spray control valve should be installed on the main pipeline.
8.5 The piping system should be easy to clean, maintain and replace.
8.6 A backflow device should be installed in the liquid outlet pipeline so that when spraying is stopped or small flow is sprayed, the liquid medicine can quickly flow back to the liquid tank.
8.7 Filters should be installed in the inlet and outlet pipelines of the medicine pump, and the diameter of the outlet pipeline filter should not be larger than the minimum diameter of the nozzle. Suitable
Set multi-layer filtering. The filter should be easy to clean and replace.
8.8 The spray boom should have sufficient strength, and the fixed points should be firm to ensure that when other equipment is installed on the spray boom, there will be no local load and vibration.
The increase in the additional load caused damage to the aircraft and the boom.
8.9 In the case of ensuring that the flow rate meets the design requirements, the cross-section of the spray rod should be round, oval, or water drop shape.
8.10 One end of the spray rod should be provided with a closable hole for cleaning.
8.11 The length of the spray boom should be controlled within 1 m of the inner side of the wingtips at both ends, and should be installed on the lower trailing edge of the wing to reduce the spray distribution of the wingtip vortex.
Impact.
9 Emergency release device design
9.1 The emergency release device should be simple, easy to operate, and clearly marked.
9.2 The operating parts of the emergency release device should be separated from the operating parts of the spraying equipment as far as possible. When it cannot be separated, measures should be taken to avoid misoperation.
9.3 The emergency delivery flow rate of chemical liquid should not be less than 100 kg/s, and the emergency delivery response time should not exceed 2 s.
10 Windmill design
10.1 The installation position of the windmill should ensure that its rotating plane does not intersect the cockpit, and try to avoid contact with the aircraft fuel tank, pipelines, circuits and controls.
Intersection of institutions, if the intersection cannot be avoided, protective measures should be taken to prevent damage to the pilot and the aircraft when the windmill is damaged.
10.2 The installation angle of the windmill blades should be adjustable to ensure that the spray system obtains appropriate power.
10.3 The windmill should be equipped with a brake or feathering device to stop the windmill from rotating when necessary.
11 Marking, packaging and storage
11.1 Logo
11.1.1 Each spraying equipment should have a product mark in an obvious position.
11.1.2 The product mark shall at least include.
a) Manufacturer's name;
b) Product name and model;
c) Date of delivery.
11.2 Packaging
11.2.1 The parts and components that have passed the inspection should be cleaned of residues and stagnant water in the cavity before packaging. When packing all hoses, avoid bending and tying
wear.
11.2.2 The following documents should be attached to the packing box at least.
a) Product quality certificate;
b) Product instruction manual;
c) Packing list;
d) Illustrated parts catalog.
11.2.3 There should be moisture-proof and upward signs on the packing box.
11.3 Storage
11.3.1 The equipment storage place should be ventilated, dry, and avoid contact with chemical substances.
11.3.2 Equipment that has been idle for a long time should be checked regularly. Parts that have life requirements such as rubber parts and plastic parts should be used within the validity period.
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