Start With the Pump Outlet and the Pump Curve
A pump with a 2-inch discharge outlet should normally be connected to a 2-inch layflat hose. Reducing immediately to a smaller hose adds friction, reduces flow and can increase strain on the pump. Increasing the hose size is possible, but the practical benefit depends on the pump curve and the length of the line.
Look at the pump curve for the flow and pressure at the operating point. A pump may be rated at a high maximum flow with zero head, but deliver much less flow when it lifts water or pushes it through several hundred metres of hose. This is why two pumps with similar horsepower can need different hose pressure classes.
- Record the pump outlet size, maximum flow in m³/h or litres per minute, and maximum head in metres.
- Measure the horizontal run and vertical lift, including the height from the water level to the highest discharge point.
- Allow for bends, fittings, valves and long hose runs, because each adds friction loss.
Choose the Pressure Class From the Duty, Not the Diameter
The hose diameter controls the connection size; the pressure class controls how much internal pressure it can safely handle. A short plot irrigation line and a long uphill transfer line can both use a 2-inch hose, but they may need different working-pressure ratings.
| Application | Typical hose class | What to check |
|---|---|---|
| Short field irrigation with a low-head pump | 4 bar | Pump curve, actual flow and total hose length |
| Longer run, higher lift or a stronger engine pump | 6 bar | Operating pressure at the pump outlet and surge allowance |
| High-head transfer or demanding site use | 8–10 bar or a reinforced range | Continuous working pressure, couplings and installation method |
Typical starting points for a 2-inch PVC layflat discharge line
Use the Correct Hose on the Suction Side
The hose between the water source and the pump is under vacuum, not normal delivery pressure. A standard layflat hose can collapse when the pump starts. Use a suction helix hose or a steel-wire reinforced hose that is designed to resist negative pressure, then use the 2-inch layflat hose after the pump.
The suction line should be short, airtight and fitted with a suitable strainer. A tiny air leak on the suction side can reduce pump performance even when the discharge hose is correctly sized.
Plan the Couplings Before You Order
Confirm whether the pump uses BSP threaded fittings, camlock couplings, Storz, Bauer or another local standard. A 2-inch hose can be supplied with different end fittings, and mixing standards after delivery can be expensive.
For long runs, decide whether sections will be joined with symmetrical camlocks or whether one end needs a pump adaptor and the other a nozzle or outlet. Include spare gaskets and specify whether the hose will be dragged, buried, rolled between fields or used from a fixed line.
What to Send for an Accurate Pump and Hose Recommendation
A useful enquiry includes: pump outlet size, required flow, total head, suction lift, horizontal run, water condition, roll length, coupling standard and destination country. A simple sketch or photo of the pump nameplate is often enough to remove the uncertainty.
Products mentioned in this guide
Плоский ПВХ-шланг
Полиэфирное плетение с ПВХ покрытием — для орошения и пожаротушения
View productВсасывающий ПВХ-шланг со спиральным каркасом
Жёсткая пластиковая спираль — устойчив к отрицательному давлению и истиранию
View productСоединительные муфты и фитинги для шлангов
Полный ассортимент соединений для шлангов, насосов и оросительных систем
View productFrequently asked questions
Can I use a 2-inch layflat hose with a 1.5-inch pump outlet?
It can be done with an adaptor, but the outlet is the limiting point. A short enlargement may reduce hose friction, but it will not make the pump deliver more than its curve allows. Keep transitions gradual and avoid repeated reductions.
Does a larger hose increase pump pressure?
A larger hose generally reduces friction loss, but it does not increase the pump pressure beyond its performance curve. Pressure comes from the pump, vertical lift and system resistance.
Which pressure class should I choose for a 2-inch irrigation hose?
Start with 4 bar for light, short low-head irrigation. Choose 6 bar or higher for long runs, steep lift, strong engine pumps or pressure spikes. Confirm the final class from the pump outlet pressure and the job conditions.