Pressures in Hydraulic Machinery
Pressures in Hydraulic Machinery
(OP)
Not sure if this is the right forum, but...
We have a mechanical specification for hydraulic machinery that lists all rock breakers must operate at pressures below 180 bar.
I've had a look at a number of rock breakers on the market and pressures far above this (over 300 bar) are common. My question - why would this pressure limit be required? Possibly it's from an old specification when systems operating within these ranges were dangerous (and are not anymore)?
Any hydraulic experts? Is it a safety issue or maintenance/cost/other?
We have a mechanical specification for hydraulic machinery that lists all rock breakers must operate at pressures below 180 bar.
I've had a look at a number of rock breakers on the market and pressures far above this (over 300 bar) are common. My question - why would this pressure limit be required? Possibly it's from an old specification when systems operating within these ranges were dangerous (and are not anymore)?
Any hydraulic experts? Is it a safety issue or maintenance/cost/other?





RE: Pressures in Hydraulic Machinery
Additionally, rock breakers are no doubt subject to continuous impact events that produce large, destructive hydraulic transients.
Additionally, the parenthetical assertion that hydraulics operating at pressures below 180 bar are no longer dangerous, is fallacious.
Mike Halloran
Pembroke Pines, FL, USA
RE: Pressures in Hydraulic Machinery
RE: Pressures in Hydraulic Machinery
Who issued the specification?
There could be any number of reason for the 180 BAR limit.
It seems counter productive to put such limits on the hardware. Such low pressures will necessitate larger diameter actuators to achieve the desired forces. The machines just become bigger and slower.
If is to preserve the hardware, it does make sense as the higher pressure will reduce the fatigue limits of the materials.
Adrian
RE: Pressures in Hydraulic Machinery
RE: Pressures in Hydraulic Machinery
Many carriers today can deliver, have the capacity to deliver, 5000psi(345bar) or higher and that is generally not an issue when running breakers.
Ted