What is EWP?
Effective Working Pressure or EWP, is a term used to mislead and confuse people into what they are buying.
In the Australian market, there are some people that will use the term EWP to create the impression that a pump can dramatically increase in performance by adding a Turbo or Rotary Nozzle.
For example, a machine is rated to 3000 Psi at 12 l/min, by adding a Turbo Nozzle you can achieve an EWP of 4500 Psi at 12 l/min. From this, you can assume that by adding the Turbo Nozzle you have increased your pressure, well no you haven’t because a Turbo Nozzle doesn’t work that way.
HOW A TURBO NOZZLE WORKS
A Turbo Nozzle projects a pin jet of water at a surface and rotates it at high speed. This effectively gives you a wider cleaning area and different angles of an impact than a normal nozzle.
SO HOW DOES THIS RELATE TO EWP?
Well according to the example above a Turbo Nozzle increases the maximum operating pressure of the pump, but how can it when it is only a spinning nozzle that only cleans faster.
It is not possible to run a pump at a higher pressure then what it is engineered to work at without causing major damage to the pump, operator or the machine.