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General rules for operation selection of sprinkler systems

1.1 in order to make effective use of sprinkler and give full play to the benefits of equipment, special specifications for sub-operation selection are prepared.

1.2 this specification is mainly applicable to the selection of type and field planning design of coil disc sprinkler and its supporting equipment.

1.3 the project planning, design and operation of disc sprinkler shall not only conform to this specification, but also conform to the existing relevant standards and regulations.

2 composition and function

2.1 coil disc sprinkler is a kind of spray irrigation machine that wraps the traction hose on the reel, USES pressure water or other power machinery to drive the coil to rotate around, and draws the sprinkler car to move and spray. It consists of sprinkler car, traction hose reel, chassis, stents, driving mechanism, the variable speed system, traction hose guide, processing of speed and safety protection system and water hose connection, etc.

2.2 nozzle car: support the nozzle and drag the nozzle to spray and move in the field.

2.2.1 single sprinkler car: it consists of single sprinkler head (generally using reversing rocker type sprinkler head), bracket, walking wheel, weight matching, fixed adjustment parts, connecting parts and pipe fittings. The performance parameters of sprinkler required for a single sprinkler are shown in attached table 1.

2.2.2 truss sprinkler head car: it consists of multiple refraction sprinkler heads, truss, walking wheel, weight distribution, fixed adjusting parts, connecting parts and pipe fittings. The performance parameters of the refraction nozzle required for the truss sprinkler vehicle are shown in attached table 3. The structural dimension parameters of truss sprinkler are shown in attached table 4.

2.3 traction hose: conveying pressure water and pulling nozzle vehicle move in the field.

The traction hose is made of polyethylene with high strength, flexibility and wear resistance. Traction hose nominal pipe diameter (outside diameter)

2.4 coil: wind the traction hose.

2.5 chassis and bracket: support and transfer.

The chassis is divided into fixed type and rotary type.

2.6 drive mechanism: generate driving force to rotate the coil and drag the nozzle car.

2.7 variable speed system: adjust the speed of the reel.

2.8 traction hose guiding device: guide traction hose is regularly wound on the reel.

2.9 speed control device: keep the sprinkler car moving uniformly during spraying.

2.10 safety protection device: after spraying in place, the coil will stop rotating automatically.

2.11 water transfer connection hose: transfer pressure water to the inlet of coil type sprinkler. See attached table 6 for the specifications.

Model, specification and basic parameters

3.1 model

3.1.1 the model of the coil type sprinkler consists of Chinese pinyin letters and Arabic numerals. Its significance is as follows:

3.1.3 type characteristics of reel chassis

Scroll plate chassis type features in lowercase Chinese pinyin letters.

D - chassis fixation;

Chassis rotation is not marked.

3.2 specifications

Volume disc of the sprinkler as defined by the traction hose diameter and length specifications varieties, traction hose Φ 40, 50, 65, 75, Φ Φ Φ Φ Φ (90) 85, 110, 125 mm Φ Φ specifications;  length from 135 to 450 m, 30 m interval 20  as a species.

The corresponding model can be referred to as JP40, JP50, JP65, JP75, JP85 (90), JP110, JP125, etc. only considering the outside diameter of the traction hose.

3.3 basic parameters of coil disc sprinkler are shown in table 7

4 operating conditions

4.1 water source: the water supply capacity shall meet the working flow requirements of disc sprinkler, and the water quality shall conform to the current effective spraying length (m) traction hose outer diameter (mm) reel chassis type

When there are impurities in the water, which cannot meet the working requirements of disc type sprinkler, treatment should be carried out to meet the working requirements of disc type sprinkler.

4.2 terrain: the slope of the surface of the rotary disc sprinkler irrigation should not be more than 20%.

4.3 climate: it shall comply with the provisions of article 3.0.3 of gbj85-1985 spray irrigation engineering technical specifications. When the design wind speed is greater than 3.4m/s and less than 5.4m/s, it is recommended to use truss sprinkler cars.

4.4 single sprinkler irrigation is applicable to crops with low requirements for atomization indicators; Truss sprinkler irrigation is suitable for low crops with high requirement of atomization index.

4.5 when spraying high-pole crops with single sprinkler head coil sprinkler, the working way should be set aside. The direction of the working way should be consistent with the direction of the planting line of crops. See table 1 for the width of the working way.

Table 1 operating path width

Standard JP40, JP50 JP65, JP75 JP85 (90)

Width (m) 0.7 ~ 1.5 1.3 ~ 1.8

5 project planning

5.1 planning principles and requirements

5.1.1 planning shall be in conformity with the relevant policies of the state and local laws and regulations and conform to the requirements of the local medium and long-term planning, analysis of the balance of water resources should be as the basis of planning, determine the appropriate design standards and irrigation system, in order to achieve to meet the requirements of agricultural irrigation, and can effectively save the purpose of water resources.

5.1.2 planning must be under the design information is important and reliable before problem, information content includes: natural geography, hydrogeology, hydrology and meteorology, surface soil, engineering present situation, the agricultural production as well as the corresponding scale topographic map and so on.

5.1.3 the planning shall be based on the local conditions and the comparison of the plans, so as to achieve the objectives of reasonable planning, convenient use and management and economy.

5.2 basic information

5.2.1 the measured topographic map: 1 ‰ ~ 5 ‰ of measured topographic map, the planning area should include irrigation ground position line, the ground buildings, residential areas, and the ground elevation (contour), scale, traffic, natural rivers, established channels, water position and height, direction, and illustrations.

5.2.2 soil: soil type, nature, thickness of soil layer, soil bulk density, upper and lower limit of suitable soil moisture content, soil moisture content.

5.2.3 crops: crop structure and location, daily water demand of crops, planned depth of moist layer, irrigation system and irrigation quota.

5.2.4 water source: location and elevation (static water level of machine well, dynamic water level or dry water level of surface water, flood water level), water flow rate, water quality report, and water source reliability data.

5.2.5 weather: perennial average rainfall, perennial average surface evaporation, maximum depth of the tundra, irrigation season wind speed and perennial average, wind direction, annual average temperature, frost-free period.

5.2.6 power: power type, capacity, structural size, existing position. 5.2.7 transportation: location, type and level of existing roads in the planning area. 5.3 water source analysis

5.3.1 it is necessary to analyze and calculate the water amount of the water source and calculate the balance of the water amount of sprinkler irrigation. For the completed water supply system of water conservancy project, the annual water supply flow should be determined according to the original design and application of the project. For new water source projects, the water supply flow should be calculated and determined according to the water source type and survey data.

5.3.2 when the water source of sprinkler irrigation is river runoff, the water amount shall be calculated according to the following requirements:

When there is a relatively long series of runoff data, the annual runoff in accordance with the design frequency and its annual distribution and irrigation critical period average flow should be calculated by frequency calculation.

In case of relatively small amount of radioactive runoff data, the related analysis method should be used to insert and supplement the extended runoff data, and then calculate and deduce the above runoff characteristics through frequency calculation.

(3), and the measured data complement can choose station, through the conversion, interpolation and runoff coefficient method calculated runoff series, can also be manual provided by the regional hydrological atlas, combined with the survey data calculated runoff characteristic value.

5.3.3 when the water source of sprinkler irrigation is local surface runoff, annual runoff of design frequency can be determined by referring to regional hydrological manuals or atlas and combining with investigation data.

5.3.4 when the water source of sprinkler irrigation is groundwater, the water amount of the water source should be analyzed according to the existing hydrogeological data, and the mining conditions of the groundwater in this region should be determined through the investigation of the water output of the adjacent engine Wells. For areas without hydrological geological data, exploratory Wells should be built and water quantity determined by pumping test.

5.3.5 when the natural water inflow process of water source cannot meet the water demand of sprinkler irrigation, a water storage project shall be built. 5.4 planning and design parameters

5.4.1 the design guarantee rate shall generally not be less than 85%.

5.4.2 design parameters of sprinkler irrigation area:

Total area of sprinkler irrigation (hm2) maximum width of sprinkler irrigation plot (m) maximum length of sprinkler irrigation plot (m)

5.4.3 working parameters of disc sprayer:

Nozzle range (m)

Nozzle flow (m3/h)

Working pressure of nozzle (Mpa)

Pressure (MPa) of disc type sprinkler feeding machine

Effective length of traction hose (m)

Water content and non-water content of coil type sprinkler (kg)

Sprinkler wheel pitch (m)

Ground clearance height of sprinkler truss (m)

Chassis wheelbase of sprinkler (m)

Dimensions (length * width * height)

Running speed of sprinkler (m/h)

5.5 field planning and layout

5.5.1 for the channel water conveyance system, one end (or both ends) of the plot should be perpendicular to the direction of planting line, and water conveyance channels should be arranged along the field roads. The channels should be lined to prevent seepage. When the water depth of the channel cannot meet the water intake needs of the water pump of the sprinkler, the working pool should be set at the water intake point of the sprinkler. The size of the working pond shall be designed according to gbt50265-1997 pump station design specification.

5.5.2 for the pipeline water delivery system, water pipes shall be arranged along the field road at one end (or both ends) of the plot perpendicular to the direction of planting line, and water hydrants shall be set at the water intake point of the sprinkler. The connection between sprinkler and hydrant should be flexible, convenient and reliable.

5.5.3 fixed pipes can be used for water pipes buried underground or mobile pipes. Mobile pipeline should be flexible, convenient and reliable. The water pressure provided by the pipeline should meet the working pressure of the sprinkler. When the water pressure provided by the pipeline cannot meet the working pressure of the sprinkler, the water pump pressure should be set between the sprinkler and the hydrant.

5.5.4 field plots shall be divided into long strip plots, and the axis of the field shall be perpendicular to the main wind direction.

6 selection and calculation

6.1.3 when the system has multiple disc sprayer at the same time, the design flow rate of the system is equal to the sum of the design flow rate of multiple disc sprayer.

6.1.4 when the system USES multiple roller-disc sprinkler systems to work, the winch type sprinkler systems of the same specification should be selected as far as possible.

6.2 select the type of disc sprinkler

6.2.1 the working flow rate of the disc sprinkler shall be smaller than that of the water supply

6.2.2 number of plate-type sprinkler platforms N:

Where: a -- the area controlled by a single coil disc sprinkler

Q -- spray flow rate of disc type sprinkler (m3/h)

6.2.3 the intensity of sprinkler irrigation shall not be greater than the allowable intensity of soil sprinkler irrigation. The allowable intensity of soil sprinkler irrigation is shown in article 3.0.9 of the technical specification for sprinkler irrigation engineering gbj85-1985.

6.2.4 the spray irrigation atomization index shall comply with article 3.0.10 of gbj85-1985 spray irrigation engineering technical specifications.

6.3 planning calculation

6.3.1 width of spray irrigation strip b(m) b=2kR of single-head vehicle

K - range overlay coefficient, k value can be selected from table 2.

Table 2 range overlay coefficient

6.3.2 the spray irrigation strip width of truss sprinkler vehicle b (m) b= b +2kR

R - truss end spray head range (m).

6.3.3 single-nozzle spraying fan Angle: in order to enable the nozzle to work on the dry ground, fan spraying should be selected. The size of fan Angle directly affects the intensity and uniformity of spray irrigation.

6.3.4 continuous effective spraying length S (m)

In equation S=L+ 0.5r: L - length of traction hose (m).

6.3.5 the intensity r(mm/h) of sprinkler irrigation can be obtained from the product parameters, which should be determined by the actual measurement when no product parameters are available.

The intensity of single sprinkler irrigation can be approximately calculated using the calculation formula of single sprinkler fan positioning spraying:

Where: 0.9 -- reduction coefficient of nozzle range. The strength of the truss sprinkler should be calculated by superposition of rainfall distribution of refraction sprinkler head or approximate calculation according to the following formula.

6.3.6 speed V(m/h) of sprinkler vehicle

6.3.7 design daily net spraying time: no less than 16h.

6.3.8 working time of continuous spraying strip net spraying irrigation t1(h) t1=L/V

6.3.9 TLS (h) of the total working time of a continuous spraying strip =t1+t2

Where: t2 - shift preparation time (h).

6.3.10 h(mm) of primary irrigation depth should be slightly greater than the designed irrigation quota, which can be calculated by the following formula.

6.4 design pressure

6.4.1 system design working pressure head H(m)

Where: Hm -- disc type sprinkler design (machine entry) pressure head (m)

HW -- loss of water head in water supply piping system (excluding loss of traction hose along the way and partial loss) (m);

Z -- difference between the design position of sprinkler head and the ground elevation of water source working water level (m);

Water head loss Hw can be calculated according to the following formula

Where: k -- local head loss coefficient, k=1.05~1.1;

F - friction coefficient;

L -- -- pipe length (m);

Q -- pipeline flow (m3/h);

D -- tube inner diameter (mm);

M-flow index;

B -- pipe diameter index.

The f, m and b values of various pipes can be determined according to table 3

6.4.2 design position refers to the position where the maximum working pressure of water pump is required when the system is working normally.

6.5 equipment

6.5.1 water pump head and flow shall meet the design working pressure and design flow requirements.

6.5.2 motor shall be preferred in power selection, and other power may be used in areas without power supply system or areas with severe power shortage.

6.5.3 the water supply pipeline system shall be reliable in work, convenient in installation and maintenance, and meet the requirements of system design working pressure and design flow.

6.5.4 the traction equipment shall meet the requirements of the rolling disc sprinkler transfer plot and the traction sprinkler vehicle. The traction power N(Kw) can be calculated according to the following formula, which can be calculated by dividing the clay road surface and the land after the plough, and the large value can be obtained.

Where: k-power supporting coefficient, k=1.2~1.3. When the power is large, take small value; when the power is small, take large value.

V0 -- traction speed, V0=10km/h for general clay pavement; Land V0=4km/h after plowing;

H -- mechanical efficiency, h=0.75;

P -- resistance of walking wheel (N), P=fMgcosa+Mgsina;

F - rolling resistance coefficient, clay road f=0.05; Land f=0.16 after plough;

Water content quality (kg) of m-coil type sprinkler and irrigation machine;

G -- gravity acceleration (m/s2);

A - the Angle between the ground and the horizontal plane.

7 operation and maintenance

7.1 installation and debugging

7.1.1 operators must have professional training to master the working principle, structure and structure of the coil disc sprinkler

Methods.

7.1.2 after the disc sprinkler reaches the working position, adjust the direction of the reel to be consistent with the spray irrigation strip and lock it.

7.1.3 put down the sprinkler and pull it to the other end of the strip, the speed shall not exceed


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