Duport PTW 8500
Trailed working liquid tank for the Liquiliser system: 8,500 l, stainless steel
Liquiliser system tank. Stainless steel for UAN.
Capacity of the largest tank in the PTW range
Pump (PTW 6000 and PTW 8500)
Tank construction — UAN requirement
Trailed working liquid tank for the Liquiliser system: 8,500 l, stainless steel
The PTW 8500 is a trailed liquid-application tank in the Duport Liquiliser system, designed for liquid mineral fertilisers (UAN, liquid N-P-K multi-nutrient fertilisers, and aqueous solutions of ammonium nitrate and urea). It is the largest tank in the range (PTW 3000, PTW 6000, PTW 8500) and the only one built entirely from stainless steel, a requirement due to the chemically aggressive nature of UAN. With a 500 l/min pump and ISOBUS control, the PTW 8500 supplies the working liquid to the Liquiliser injection frame (typically SW 13554 — 13.5 m working width, 54 injection wheels). Together they form a single-pass applicator for sub-surface injection into the root zone using CULTAN technology. The PTW 8500 is not a slurry tanker — Duport handles slurry and digestate with a separate product line ("slurry tankers with pump") of a completely different design.
PTW 8500: RSM carrier in the Liquiliser system
The PTW 8500 is a towed tank for liquid working material of the mineral line, not a slurry wagon.
Stainless steel for aggressive RSM
RSM and ammonium nitrate solutions are chemically aggressive. The PTW 8500 is made entirely of stainless steel, which is a durability requirement, not decoration. The smaller PTW 6000 can be made of polyethylene; at 8,500 l, the extent of contact with an aggressive medium justifies stainless steel.
Source: Duport Liquiliser catalogue 2026
A different line from slurry tankers
The shared abbreviation “PTW” appears in two Duport lines. The mineral line (PTW 3000/6000/8500) is part of the Liquiliser system. Slurry tankers are a separate line. These are different machines: the medium, the pump and the way capacity is marked all differ.
PTW pair + SW injection frame
The PTW 8500 delivers the working liquid to the Liquiliser injection frame (typically SW 13554 — 13.5 m, 54 injection wheels). Together they form a single-pass applicator for sub-surface injection into the root zone using CULTAN technology.
Capacity = fewer trips to the ramp
The 8,500 l capacity is a logistical advantage for large areas: one CULTAN injection replaces two to three top-dressing passes with a spreader, and the larger tank reduces the number of returns to the transfer ramp during a shift.
Stainless steel — a requirement, not decoration
Urea-ammonium nitrate solution (UAN) and ammonium nitrate solution are chemically aggressive — in tanks made from inferior materials, problems appear after a few seasons: weld corrosion, micro-leaks, deterioration in the quality of the applied fertiliser. Duport solves this in a straightforward way: the PTW 8500 is made entirely of stainless steel. The smaller tank variants (PTW 3000 and PTW 6000) may be made of polyethylene, but at 8,500 l the scale of contact with the aggressive medium justifies only one material. This is not a luxury — it is a requirement for durability.
500 l/min pump — controlled by the tractor terminal
The PTW 8500 pump supplies the working liquid to the SW injection frame with a steady flow of 500 l/min. Rate adjustment — from 220 to 1,500 l/ha depending on the crop and needs — is carried out from the tractor's ISOBUS terminal (Müller Elektronik, TRACK-Leader, Section Control). No separate control panel on the tank, no need to leave the cab. The same 500 l/min pump works in the PTW 6000 and PTW 8500 — which simplifies service and the spare parts stock.
PTW + SW = single-pass CULTAN applicator
The PTW 8500 is not a separate trailer — it is an element of the system. Together with the SW injection frame (typically SW 13554, 13.5 m working width, 54 injection wheels, 25 cm spacing between wheels, 16 cm spacing between longitudinal rows) it forms a complete applicator for sub-surface injection of liquid fertilisers. The injection needles on the SW wheels — made of stainless steel, tipped with sintered carbide (~8 cm) — place UAN directly into the root zone. At the injection point a local deposit of ammonium nitrogen (NH₄⁺) forms, bound by the soil's sorption complex — this is CULTAN technology, Controlled Uptake Long Term Ammonium Nutrition.
The PTW 8500 is NOT a slurry tanker
This distinction is worth spelling out, because the name “PTW” also appears in another Duport line: the range of slurry tankers with pump (Pomptankwagens). Those PTWs (PTW 8, PTW 12, PTW 16, designated by capacity in m³, not litres) serve slurry and digestate logistics, have a different screw pump with a throughput of 4,000–8,000 l/min (many times higher than the ~500 l/min of the Liquiliser pump-tank), a different tank material and different agronomic dynamics. The PTW 8500, this specific model, is part of the Liquiliser system for MINERAL LIQUID FERTILISERS. Mixing up these two lines leads to errors in machine selection.
Duport: mineral line vs slurry line
Duport runs two separate lines. The PTW 8500 belongs to the mineral line (Liquiliser) and is not a slurry tanker.
- Working material
- Liquid mineral fertiliser (RSM, CULTAN)
- Pump
- ~500 l/min
- Capacity marking
- w litrach (PTW 3000 / 6000 / 8500)
- Application
- Sub-surface injection into the root zone (SW frame)
- Working material
- Gnojowica / poferment
- Pump
- screw type 4,000–8,000 l/min
- Capacity marking
- in cubic metres (PTW 8–18 m³)
- Application
- Slurry applicators (All Track, Schleppschuh)
The PTW 8500 (mineral line) is a different machine from slurry tankers. The shared abbreviation “PTW” does not mean the same line.
Source: Duport manufacturer data
PTW 8500 — pozycjonowanie
PTW 8500 vs an ordinary RSM tank: an ordinary tank is just a container with a simple pump. It requires a separate control panel and separate hydraulics, and unfortunately is often built from ordinary steel, which will not last long with RSM. The PTW 8500 is a tank designed as part of a complete application system: stainless steel (for RSM), a pump integrated with the tractor's ISOBUS, and hydraulics unified with the SW injection frame. The PTW + SW pair works as one machine, not two loose units. Operational benefit: shorter set-up time at the start of the season, one terminal to operate, one task list in Section Control.
PTW 8500 — specyfikacja
PTW 8500 w polu
Full-width Liquiliser (SW 13554): 13.5 m, 220–1,500 l/ha
The most common PTW 8500 configuration, paired with the SW 13554 injection frame. At a rate of 600 l/ha, one tank covers about 14 ha; at 220 l/ha, nearly 40 ha in a single pass. That is real field coverage without returning to the loading point halfway through the shift.
Large areas: UAN in one pass instead of two top-dressings
The 8,500 l capacity is a logistical argument for large-scale farms: one CULTAN injection replaces two or three conventional top-dressing passes with a spreader. Fewer operator hours, fewer tracks in the ruts, and a better nitrogen loss profile (less NH₃ to the atmosphere, less NO₃⁻ to groundwater).
Demanding field: full SW 15060 injection frame (15 m, 60 wheels)
The widest Liquiliser injection frame model, the SW 15060 (15 m, 60 wheels, 6 sections), can be configured specifically with the PTW 8500 for maximum single-pass output. A smaller tank would not be sufficient for such a working width at realistic rates.
Configuration with a smaller SW frame: when logistics call for a larger tank
Sometimes an agronomist chooses a smaller injection frame (SW 8032 or SW 12048) because of the field geometry, and a larger PTW 8500 tank to reduce the number of trips to the loading point. This is also a correct configuration: the PTW 8500 is not rigidly assigned only to the SW 13554 or SW 15060.
Dokumentacja — PTW 8500
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Kadr 0101 / 08
Conversation with an engineer.
The most common questions we hear from farms before purchase.
We have collected the questions we most often hear from farms before purchase — and the answers from our engineers. Every answer is based on verified knowledge of the machine.
- manufacturer's materials
- dokumentacji technicznej
- questions asked by farms
Answers based on the experience of thousands of farms in Europe.
No. The PTW 8500 is a towed liquid working tank in the Duport Liquiliser system, for mineral liquid fertilisers (UAN, liquid multi-nutrient fertilisers, aqueous solutions of ammonium nitrate and urea). This follows directly from the official Liquiliser 2026 catalogue (the “Model range” page, section “Towed liquid working tank”). Design, material (stainless steel), 500 l/min pump, ISOBUS integration and SW injection frames are all matched to UAN, not to slurry. For slurry, Duport has a separate product line: slurry tankers with screw pump (Enkelas, Tandemtank, 4-in-Line, in the PTW 8 / PTW 12 / PTW 16 range designated in m³). These are different machines.
Most often the SW 13554, which is the standard catalogue pairing (13.5 m working width, 54 injection wheels, 25 cm spacing, 16 cm spacing between longitudinal rows, 5 sections). The PTW 8500 can also be configured with other SW models (8032, 12048, 15060), especially when field logistics call for a larger tank with a smaller boom, or when maximum working width (SW 15060) with the largest liquid capacity is needed. The specific choice is agreed with the agronomist.
Smaller tank variants (PTW 3000, 3,000 l, and PTW 6000, 6,000 l) are available in polyethylene, because the extent of contact with the aggressive medium is lower and the cost of the tank does not justify stainless steel. At 8,500 l the balance changes: a larger internal surface area, more intensive use, and a greater risk of micro-damage after ten to fifteen seasons of working with UAN. Stainless steel is a structural match to the real life cycle of this tank class, not a marketing upgrade.
The PTW 8500 is part of the Liquiliser system and is sold together with it. In theory the tank alone can be used to transport liquid mineral fertiliser (it has its own axles, pump and ISOBUS control), but this is not typical use and not the original design scenario. The PTW 8500 is not a general-purpose transport vehicle; it is the applicator's working tank. If you need to transport fertiliser, there are more suitable solutions.
The capacity and naming are only coincidentally similar: these are different machines from different Duport lines. The PTW 8500 holds 8,500 litres of working liquid in a stainless steel tank, with a 500 l/min pump, intended for mineral liquid fertilisers (UAN, CULTAN technology). The PTW 8 from the slurry tanker catalogue holds 8 m³ (that is, 8,000 litres) of slurry in a steel tank, with a screw pump adapted to thick organic matter. These are two different products from different lines; the shared abbreviation in the name simply derives from the Dutch term for a vehicle with a pump and tank, which Duport's catalogues use to designate both classes of machine.
Yes. We keep pump components, filters, interchangeable hydraulic modules and ISOBUS terminal parts in stock for the entire Liquiliser system (SW injection frame and PTW tank). Inter-season servicing (before the spring fertilising season and after it ends) and warranty and post-warranty repairs are carried out in the field. Configuring the PTW + SW for a specific farm is also part of the pre-sale service.
Liquiliser system tank. Stainless steel for UAN.
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