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Crankshaft vs intensifier pump

Writer:SAME WaterjetNumber of visits: Date:2018-6-2
 
This topic of crankshaft vs. intensifier pumps is a somewhat controversial subject with a lot of different opinions.
 
Crankshaft vs intensifier pump
 
Note Crankshaft pumps are also referred to as “direct drive” pumps.
 
The basic difference between the two pumps is that crankshaft pumps use a crankshaft to move the plungers that pressurize the water, and intensifiers use hydraulics. Because there is no hydraulic system, crankshaft style pumps tend to be much more efficient, and thus put a higher percentage of horsepower to the nozzle. This lets a lower power crankshaft pump compete in cutting power (speed) with a higher power intensifier pump, and dominate in terms of operating cost. Note that cutting speed is also greatly a function of the control software, and how well it predicts, compensates, and optimizes for the jet behaviours around corners.
 
For example, generally speaking a 30 horsepower (23 Kw) crankshaft pump is about the same cutting speed as a 50 horsepower (37 Kw) intensifier, but the the intensifier is creating about 20 horsepower (15 Kw) of heat that is doing nothing but wasting gobs of electricity.
 
Intensifiers, however, have advantages in terms of high pressure seal life, and their ability to run multiple machines from a single pump. The extended seal life is an effect of running the plungers at a slow speed, while crankshaft pumps typically operate at faster speeds, and therefore wear faster. Intensifiers are good for running multiple machines from a single pump because they can maintain a relatively constant pressure output at one machine when a nozzle on another machine being turned on and off.
 
The main advantage of the crank-shaft style pump is that is provides more cutting power per dollar, and is therefore cheaper to purchase and run.
The main advantage of an Intensifier style pump is that the high pressure seals last a little bit longer.
 
With both systems, component life is an inverse function of operating pressure—the lower the pressure, the longer the life.
 
There is also a slight difference in the way both pumps are used. With direct drive pumps, the pump is typically turned on when a part path is started, then turned off when the path is complete. An intensifier pump is often turned on at the beginning of a shift, and then left on, regardless of whether or not the machine is cutting parts. When no flow is being drawn, the plunger is motionless. During this time, no significant wear is created. However, it does inflate the “pump hours” that one can expect between maintenance intervals, making the intensifier seem like it is significantly longer lasting than a direct drive pump, when in fact, they are closer than it seems in this regard.
 
Which should you buy? This is a tough question, and the answer depends a lot on your preferences, and a big factor is the answer to the question: What is more important, operating cost, or frequency of maintenance? If the answer is that you want the least frequent maintenance, then an intensifier might be right for you. If the answer is that you want the lowest operating cost, then a crankshaft pump is probably a better choice.
 
Source: Waterjets News

TypeInfo: Industry news

Keywords for the information:Crankshaft  intensifier pump  Direct drive pump 

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