This is a home lift 50 fpm is the top speed, these were not designed for commercial use. E311 is right. The pump size, and pipe diameter limits the amount of oil to the jack. This means unless the unit is modified? What you see is what you get....
What determines up speed is these three things-
1. Motor RPM (we assume the hp rating has been sized right)
2. Pump GPM (assuming direct coupling, at the given rpm of the motor that is driving it)
3. Diameter of the piston(s)
Internal friction of the feedline increases the horsepower requirement, but it has no direct bearing on up speed per se. Assuming the losses of the pipe diameter has been figured into the HP calculation, (so that under a full load in the up direction, the horsepower requirement to move the lift at a given speed does not exceed that of the motor), then pipe diameter doesn't enter into the speed.
Friction losses? Yes. Horsepower requirement? Yes. But not speed.
It's all about the volume of oil flowing, and the area, (could be understood as volume) of the piston. If you had a jack where one foot of piston displaced one gallon of oil, and your pump was pushing a constant 10 gallons per minute, (remember, the motor has been sized adequately to compensate for not only the static car weight, and the full load, but also the losses due to the feedline pipe diameter and elbows, etc) then your hydraulic elevator would travel 10 feet per minute. Pipe diameter notwithstanding.
