Time to build pressure
Time to build pressure
(OP)
I am trying to find a formula to determine the time required to build pressure in a cylinder.
ie. how much time would it take build pressure of 6000 psi in a cylinder by 'dead ending' it.
ie. how much time would it take build pressure of 6000 psi in a cylinder by 'dead ending' it.





RE: Time to build pressure
Don't forget to tell us how you get on.
RE: Time to build pressure
bretthydra: Tell us what kind of cylinder you think about. A kind of chamber of cylindrical shape which is pressurized by something? A hydraulic cylinder with piston and piston rod?
RE: Time to build pressure
The answer depends on fluid bulk modulus, volume of cylinder, fill rate and measurement accuracy. Would it be through filling the cylinder from empty or through intensification???
RE: Time to build pressure
OK.
Consider the attached sketch of the piston.
To reach full stroke(16mm)in 1 second, I calculate that the flow rate would have to be 0.61932 L/min.
When the rod has reached full stroke, at what rate does the pressure increase?
RE: Time to build pressure
RE: Time to build pressure
RE: Time to build pressure
RE: Time to build pressure
What exactly do you need this for brett?
Is this part of a hydraulic system?
NX 7.5
Teamcenter 8
RE: Time to build pressure
RE: Time to build pressure
It is intended to be operated by Oil.
Time will be a factor in the final circuit design although not to the nth degree.
I was just curious to see if there is a standard formula for the time to build the pressure. If there is, and depending on the magnitude, it may be a factor to consider in the overall design.
RE: Time to build pressure
RE: Time to build pressure
Do you have a >6000 psi supply of air?
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: Time to build pressure
The side of the piston with the spring will be filled with oil, put under pressure so it moves down the 16mm.
In the bottom side there is nothing but air.
Can the air escape somehow?
Or do you want to know when the air in the bottom part will reach a pressure of 6000psi?
NX 7.5
Teamcenter 8
RE: Time to build pressure
When you say air, are you talking about a standard spring-return cylinder that has a vent on it and that the air inside is not contained and is released through a breather element? i.e., is the air on the spring side vented to atmosphere?
If so, and you are pressuring the extend side of the cylinder, the answer is a few milliseconds if not less.
Engineering is not the science behind building. It is the science behind not building.