# Chemical Forums

## Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: zeshkani_usa on January 19, 2013, 08:35:45 PM

Title: hydraulic holding system for a hay-baling system
Post by: zeshkani_usa on January 19, 2013, 08:35:45 PM
design a hydraulic holding system for a hay-baling system, the system has four cylinders with a 120mm diameter pistons with a stroke of 0.320m, the lines connecting the system are 1cm id(inside diameter). there are 15.5m of lines in the system. for proper design, the reserve tank should hold a minimum of 50% more then the amount of hydraulic fluid in the system, if the diameter of the reserve tank is 30.48cm what is the shortest height it should be?

This question I' am completely stuck on, I have no idea were to start, any pointers would be great
I have the answer but i have no idea how they got it
Title: Re: hydraulic holding system for a hay-baling system
Post by: fledarmus on January 19, 2013, 08:52:50 PM
This sounds like a volume calculation to me - calculate the volume of fluid in the system, add 50%, and that's the total you want in the reserve tank. Then calculate the height, since you know the diameter.
Title: Re: hydraulic holding system for a hay-baling system
Post by: zeshkani_usa on January 19, 2013, 11:30:05 PM
so do you calculate the volume of the cylinder that times 4 since there are 4 cylinders

V=pir2h
V=3619cm3 of one cylinder

the volume of the lines are 1217.36cm3

since the tank is going to hold 50% would the volume be 1/2 the over all volume

and for the tank I' am assuming a vertical cylinder, since I' am given the diameter of 30.48cm

would h=V/r2pi       so for volume do i add the volume of each cylinder plus the volume of the lines then add 50%more

the correct answer is 32.26cm but i have tried multiple ways of doing it but i cant get the right answer
Title: Re: hydraulic holding system for a hay-baling system
Post by: zeshkani_usa on January 19, 2013, 11:51:45 PM
I got it, i just figured it out

thx for the input