Engine Speed / Oil Flow Calculation
The relationship between engine speed and the flow rate of the oil may seem unimportant, but setting aside issues such as mechanical wear on the PTO and pump, and the over speeding of the attached hydraulic equipment there is the raw FUEL COST.
A badly, (cheaply) specified system, optimising price rather than the correct components usually relies on running the engine in a higher rev. range. This may seem perfectly fine on the face of it but the chart shows the fuel cost difference. The increase may seem only marginal but worked out over a year soon becomes significant.
A crane vehicle doing 4 half hour drops a day.
Running @ between 900 & 1000 RPM = £3.00 / drop.
£3.00 x 4 drops = £12/day.
£12/day x 5 days/week = £60/week
£60 x 50 weeks/year = £3000/year
Running @ 1500 RPM = £4.75/drop
£4.75 x 4 drops = £19/day
£19/day x 5 days/week = £95
£95 x 50 weeks/year = £4500/year
A £1500 saving
If the initial cost saving for poorly specified equipment was only £200.00
YOU WOULD SAVE ENOUGH TO SPECIFY THE JOB CORRECTLY SEVEN TIMES OVER!!!