Selecting the right high-pressure (plunger) pump based on pressure, flow rate, and configuration. Pressure and flow rate trade off against each other, so the required operating point must be clearly defined. See the overview at the high-pressure pumps page.
Step 1 — Determine the Operating Pressure
Pressure (bar) depends on the application: surface washing, waterjet cutting, hydrostatic testing, or concrete demolition. Industrial plunger pumps reach up to ~3,000 bar; select with a safety margin above the required pressure.
Step 2 — Determine the Flow Rate
Flow rate (l/min) determines work throughput. Note that the higher the pressure, the lower the available flow rate at the same power — balance both parameters according to your requirements.
Step 3 — Select the Plunger Configuration
Triplex (3 plunger) is the common configuration; quintuplex (5 plunger) delivers a smoother flow and higher power capacity. More plungers reduce pressure pulsation and distribute load more evenly for continuous operation.
Step 4 — Drive & Safety Accessories
Electric motor or diesel engine (for mobile field applications). Safety valves, pulsation dampeners, and pressure-rated spray/cutting nozzles are mandatory. Pipes and fittings must be rated for the operating pressure.
For washing and waterjet cutting applications, see the article high-pressure pumps for washing & waterjet. Thái Khương Pumps is an authorized distributor of Kamat (Germany).
High-Pressure Plunger Pump Operating Range — Up to 3,000 bar
Industrial plunger pumps cover pressures up to approximately 3,000 bar and flow rates up to 500 l/min (both parameters trade off against each other at the same power), with 3–5 plunger configurations providing smooth flow and a design built for continuous duty — fundamentally different from domestic pressure washers intended for intermittent use only.
Size selection starts with the application: surface washing typically requires a few hundred bar, heat exchanger cleaning 800–1,500 bar, waterjet cutting and concrete demolition above 2,000 bar. Only then calculate the flow rate based on the number of guns/nozzles operating simultaneously — under-calculating total nozzle flow is the most common configuration error.
| Application | Reference Pressure Range |
|---|---|
| Industrial washing, surface cleaning | 200 – 800 bar |
| Heat exchanger and pipeline cleaning | 800 – 1,500 bar |
| Waterjet cutting, concrete demolition (hydrodemolition) | 1,500 – 3,000 bar |
Frequently Asked Questions
What parameters should be used to select a high-pressure plunger pump?
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Operating pressure (bar), flow rate (l/min), and duty cycle (continuous or intermittent). The product of pressure × flow rate determines the required motor power — an error in either parameter leads to an incorrect selection of the entire unit.
How does a high-pressure plunger pump differ from a high-head centrifugal pump?
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A plunger pump is a positive displacement pump: flow rate remains nearly constant regardless of pressure, achieving very high pressures (hundreds of bar) at relatively low flow rates. Multistage centrifugal pumps are suited to high flow at moderate pressure. Washing, hydrostatic testing, and waterjet applications require a plunger pump.
What safety accessories are required with a high-pressure pump?
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Safety valve, pressure regulator, pressure gauge, and pulsation dampener are mandatory — a positive displacement pump with a blocked discharge will build pressure until equipment failure if a safety valve is absent.
Spare parts for high-pressure plunger pumps: see in-stock catalogue by model.
Send your application parameters — Thái Khương Pumps engineers will advise on configuration and provide a quotation with CO/CQ documents within 24 hours. Request a Quotation →
