* EWP = Effective Working Pressure (using a Turbo Nozzle) – is a theoretical figure. Operating pressure is firstly dependent on the power of the engine/motor that drives it and secondly on the application. Operating Pressure in Industrial Pressure CleanersĪs we’ve explained above, the OPERATING PRESSURE (or Set-up Pressure) is the pressure at the nozzle, which can be read on a proper Pressure Gauge fitted to the machine. Now if you only put a 5 hp motor/engine on this pump which requires 10 hp, you will still get 15 lpm running at the same revs (because for every stroke of the piston a certain volume of water is pumped which does not change) but the pressure will only get to half of 3500 psi, which is an OPERATING PRESSURE of 1750 psi. Why? Because for most general cleaning of painted surfaces you don’t want a set-up pressure of more than 3000 psi because you will damage the paint. We might put a 10 hp engine/motor on it but still only set it up at an OPERATING PRESSURE og 3000 psi, even though there is enough pressure to drive it to 3500 psi. This OPERATING PRESSURE can often be changed on the request of the customer depending on customer needs or application.Įxample: A pump might have a MAXIMUM PUMP PRESSURE of 3500 psi, 15 lpm which may require 10hp to drive it to this pressure. Unlike other companies, we put Operating Pressures on our Spec Sheets and other documentation because that is the important one – the REAL pressure. Most companies only give you this Max Pump Pressure and not the OPERATING PRESSURE – which is the important one. This has nothing to do with the OPERATING PRESSURE (or ‘pressure at the nozzle’ or ‘working pressure’, except to know that the OPERATING PRESSURE must be below the MAXIMUM PUMP PRESSURE otherwise you will damage the pump and lose your warranty. Maximum Pump Pressure is the Maximum Rated Pressure the pump can operate at. If you put too big an engine/motor on a pump and you drive it above this max pump pressure, you can damage or ‘blow up’ the pump. Pump Pressure (in psi) is the maximum pressure the pump can take or which it is rated at – using in our case an Industrial Water Blaster. Maximum Pump Pressure (or Maximum Rated Pressure)
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