Application GuideFixed DYPJP800

Most irrigation pivot system decisions go wrong before anyone compares models. They go wrong when a field is measured by its total area instead of by the shape a machine can actually irrigate, and when a water source is described by its nominal yield instead of by the flow and pressure that arrive at the machine inlet. This application guide runs both checks in the order a project planner should run them, using published machine data for two machines from YULIN IRRIGATION (China Yulin Irrigation Equipment Co., Ltd., Dalian, China): the Fixed DYP center pivot and the JP800 hose reel irrigation machine.

The short answer: the Fixed DYP is an electrically driven, multi-span center pivot that irrigates a circle - 177.6 m covering 10 ha, 307.4 m covering 30 ha, 395.6 m covering 50 ha and 565 m covering 100 ha - and it is rated for a 380 V-460 V supply. The JP800 is a travelling hose reel irrigation machine driven by a water turbine, so it requires no electricity at all; it works from a 300 m PE pipe and is specified for 25-52 t/h of flow at 0.6-0.9 MPa of inlet pressure. The first machine fits fields that can contain the circle. The second fits strips, irregular parcels and sites where power is the binding constraint.

Problem definition: why water source and field shape decide first

A center pivot covers a circle and nothing else. Within that circle, the published land usage coefficient of the Fixed DYP is not less than 0.9, and the machine irrigates by circular motion in both clockwise and anti-clockwise directions. Ground outside the circle is not covered by the pivot itself, which is why corner coverage has to be designed as a separate decision. In a project delivered for a farm in Papua New Guinea, the buyer specified an end spray gun specifically to provide supplementary irrigation for the corners.

The water source sets a second, harder constraint. On the Fixed DYP, each span carries its own electromechanical drive, reversible and individually controlled, and the machine's movement mode follows the motor of the last tower in a continuous, start-stop cycle. A machine that runs that way needs a supply able to follow its duty cycle; it is not built around an intermittent source.

The JP800 publishes a much narrower window: 25-52 t/h of flow at 0.6-0.9 MPa of inlet pressure, delivered through a 90 mm PE pipe 300 m long, feeding nozzles of 16-22 mm that produce a spray radius of 19-41 m. Those figures describe the water source the machine was designed around, and a source outside that window is a different engineering conversation.

The cost of a mismatch appears late. Wrong geometry produces unirrigated corners or overlapping lanes; a wrong source produces pressure at the nozzle that never reaches the design point. Neither problem is repaired by choosing a larger machine.

Industry background: what the market data says about site matching

The global center pivot irrigation system market was estimated at USD 2.56 billion in 2025 and is projected to reach USD 5.67 billion by 2030, according to Mordor Intelligence. Alongside that growth, large contracts are moving into regions where farm-level infrastructure varies from site to site: in 2024, Lindsay Corporation secured a multi-year international irrigation supply agreement for the MENA region valued at more than USD 100 million, and Valmont Industries reported Agriculture segment sales of USD 278.0 million in Q4 2024, equal to 26.7% of its total net sales.

On the technical side, the reference for irrigation performance remains ISO 11545:2009, the active international standard that specifies the in-field method for determining the uniformity of water distribution from centre-pivot and moving lateral irrigation machines. It matters because it defines uniformity as a field measurement rather than a catalogue claim.

The planning consequence is straightforward. As pivot demand expands into areas with mixed grid reliability, variable well capacity and irregular field boundaries, the decisive question for a project is less about brand position and more about which machine the site can actually feed and accommodate.

The two machines, described in planning terms

Fixed DYP center pivot: the circle is the unit of design

The Fixed DYP is a fixed center pivot irrigation system with the pivot point at the center of the irrigated circle. YULIN IRRIGATION publishes its model range as machine length against covered area, and the two numbers are linked.

The link is worth understanding during layout. If the machine length is the radius from the pivot point to the end of the last span, the covered area follows the circle: 177.6 m gives roughly 9.9 ha, 307.4 m roughly 29.7 ha, 395.6 m roughly 49.2 ha and 565 m roughly 100.3 ha, which is consistent with the published coverage. Use that as a cross-check, because the machine does not shrink: if the field boundary is smaller than the catalogue circle, the boundary decides which model fits, not the brochure.

Two construction details are worth checking on any pivot quotation, because they decide how a machine survives its site. The first is material: the Fixed DYP is built from Q235B metal conforming to GB 13912-2020, with a hot-dip galvanized anti-corrosion coating on the structure and hot-dip galvanized discs on the 14.9-24 tower wheels. The second is electrical protection: the control panel is rated IP65, the tower box IP33 and the collector ring IP65. On saline-alkali soil, coastal humidity or high-wind sites, those are the numbers that shape service life and maintenance load.

JP800 hose reel: the machine for sites without power

The JP800 is a water turbine driven travelling hose reel irrigation machine, and it belongs to the hose reel irrigation system category. Water is the only external input it needs, because the machine requires no electrical supply. YULIN lists simple operation and installation, quick and convenient movement, water and labour savings, and a low cost profile among the machine's published selling points.

The geometry of a hose reel is a lane, not a circle. One 300 m PE pipe run sets the working lane length, while the nozzle selected from the 16-22 mm range sets the spray radius and therefore the wetted width. A hose reel layout is therefore a plan of lanes: how many runs cover the field, and how the machine is repositioned between them.

Step-by-step: matching an irrigation pivot system to the site

Step 1 - Measure the largest machine-sized shape the field can contain

Start with the boundary, not the area. Draw the largest circle the block can hold and compare its diameter with the published model lengths. Then record what remains outside the circle. In a square field the four corners stay dry, and that area needs its own method: an end spray gun, as specified by the buyer in the Papua New Guinea project, or a second irrigation machine. If the block cannot hold a circle of useful size, stop here and evaluate lanes instead.

Step 2 - Establish the water source duty point before the model

Two different measurements matter, depending on the machine. For the JP800, the source must deliver 25-52 t/h at 0.6-0.9 MPa at the machine inlet; anything outside that window sits outside the published specification. For the Fixed DYP, confirm the design flow and pressure for the nozzle package you intend to run together with the pressure regulator setting of 10, 15 or 20 psi, and confirm that the pump can hold that duty point through a continuous, start-stop cycle. Because each span is driven individually and reversibly, the pivot is not designed around a source that can only be run intermittently.

Step 3 - Check power at the field edge

The Fixed DYP is rated for 380 V-460 V and runs on electromechanical tower drives. Where the grid is absent or unreliable, it can be fed from an external power connection or from a diesel generator; the Papua New Guinea project ran the pivot from an independent diesel generator set. The JP800 removes the question instead of answering it: with a water-turbine drive it requires no electricity, which also means no cable route, no transformer and no generator set. Also confirm the ambient range, because the Fixed DYP is published for operation from -45 C to +45 C.

Step 4 - Convert geometry into a machine decision

• Circle fits inside the block and power is available: specify the Fixed DYP, sized by the circle that fits.
• Strip, irregular boundary, terraces or small parcels: specify the JP800 and plan it as 300 m lanes.
• Mixed farm: pivot for the main block, hose reel for the outer parcels and corners.

The one rule that cannot be negotiated is that a center pivot cannot be reduced to match a boundary. Covered area is a property of machine length, and the published coverage values are fixed at 10, 30, 50 and 100 ha.

Step 5 - Lock the mechanical details the site imposes

• Ground clearance: 3 plus/minus 0.2 m from the ground to the bottom of the truss rod, which determines whether the machine can pass over tall crops.
• Application rate: rain intensity not more than 0.16 mm/min, which matters where soil intake is slow.
• Crop protection: average drop diameter not more than 1.1 mm and plant mechanical damage not more than 2%.
• Pressure regulators: 10, 15 or 20 psi, selected together with the nozzle package and the measured source pressure.
• Tower wheels: 14.9-24 irrigating tyre, two wheels on each trolley, with hot-dip galvanized discs.
• Water quality: the machine is specified for water with pH 6-7.5 without quality problems during the warranty period. Where the source falls outside that range, project-specific protection may be required; in the Papua New Guinea project the buyer specified an optional poly pipe intended to prevent acidic or alkaline water from corroding the pipes, and to allow pesticide injection during irrigation.
• Electrical build: collector ring with 11 rings, not less than 4x90 A and 7x25 A, and copper cable cores of not less than 4x4 mm2 plus 7x1.0 mm2.

Step 6 - Plan transport, installation and commissioning

The JP800 ships at 2450 x 2000 x 2250 mm against an outside size of 6120 x 2330 x 2770 mm, so transport planning starts with the shipping envelope rather than the working envelope. A center pivot is assembled in the field across its spans, so the sequence is survey, tower positions, span assembly, alignment and commissioning. YULIN IRRIGATION provides localized on-site installation, commissioning and operator training services overseas, which keeps the commissioning step inside the supplier's scope rather than the buyer's.

Use cases: three site profiles

Case 1 - 50 ha block, dry season, no reliable grid (delivered project)

A farm in Papua New Guinea needed irrigation during the dry season, when irrigation substitutes for rainfall. The delivered configuration was a center pivot with a 395.6 m machine covering 50 ha, matched with an end spray gun and a 1000 L fertilizer tank. The working condition was high temperature, and the machine was operated either from an external power connection or from a diesel generator, with electromechanical, reversible spans controlled individually. The buyer also specified an end spray gun to provide supplementary irrigation for the corners, an optional poly pipe to protect against acidic or alkaline water, and pesticide injection for integrated pest control during the irrigation pass.

Case 2 - Narrow or irregular parcel without power

Where a block is too narrow for a useful circle, or the boundaries are irregular, or there is no grid connection at the field edge, the JP800 is planned as lanes. One run is defined by the 300 m PE pipe, and the nozzle selected from the 16-22 mm range produces a spray radius of 19-41 m. The source must then be able to deliver 25-52 t/h at 0.6-0.9 MPa, and because the drive is a water turbine, no electrical infrastructure has to be brought to the field.

Case 3 - Mixed farm with a large block and outer parcels

A site with a large, roughly square main block and irregular outer parcels is normally a two-machine plan rather than a compromise. The main block takes a Fixed DYP sized to the circle it can contain - 395.6 m for 50 ha or 565 m for 100 ha, fed at 380 V-460 V - while the outer parcels and corners are served by a JP800 working in lanes. This keeps the pivot running on its designed circle instead of being reduced to fit the smallest part of the farm.

Comparison table: Fixed DYP center pivot vs JP800 hose reel

Frequently asked questions

Conclusion: describe the site before the machine

The matching logic behind both machines is the same. If the field can contain a full circle and a 380 V-460 V supply is available at the pivot point, the Fixed DYP is sized by the circle it can hold, from 177.6 m for 10 ha up to 565 m for 100 ha, and the corner area is handled separately with an end gun or another method. If the field is a strip, an irregular parcel or a block without reliable power, the JP800 replaces the electrical question with a water question: 25-52 t/h at 0.6-0.9 MPa, feeding a 300 m lane with a 19-41 m spray radius. In both cases the site survey, not the model list, produces the specification.