Often it happens at sites for pump operation, they still don't understand the operation of the waterjet unit, some operators don't understand what rpm is adjusted to the load of the pump load, high rpm is often related with wasteful use of fuel so sometimes rpm is set as low as possible with high load loads.
What is the impact of low rpm and high load?
Example of pump pressure at 15,000 Psi but running at engine rpm at 1200 (just slightly above idle rpm)? Maybe the pressure could be reached 15,000 Psi but the impact that occurs on the pump components is very risky, the low engine rpm condition results in insufficient / dense water supply into the fluid end of the pump so that in the compression chamber air bubbles will appear and cause cavitation so that it can cause damage to components pump, for example the plunger may break or the cartridge may crack so that the life of the pump will not be long.
If the operation is always like that the components that have been replaced with new ones will not take long and will quickly break down again, in addition, it is necessary to remember that the price of each component is not cheap.
So, giving more attention must be paid to the problem of operating the waterjet pump unit, especially adjusting engine rpm with the pump load so that there are no problems while working and material losses to time due to incorrect operation due to more emphasis on fuel efficiency with low rpm operation.
Then how to adjust rpm and load pressure?
Each pump has a minimum and maximum capacity specification at engine rpm to supply water to the fluid end chamber (water compression chamber). For example, for the NLB 20305D unit, the minimum water supply from the booster pump to the fluid end is when the engine is running at 1500 rpm, so when we are running at low pressure, don't let the engine rpm be less than 1500, on the contrary, for high pressure, it is adjusted again to be maximized to rpm. 2200 does not matter if maximum flow is needed too.