Calculating Pressure - Mining Equipment

It is impossible to say about pressure. Diferent hydraulic use a diferent pressure. You have to know the parameters of hyd. cylinder or hyd. motor.

I like a high pressure because hyd. equipment is smaller.

But "Gear pump"+"protectine valves" use as a standard decision.

Here is some information: http://www.hawe.de/

Best regards

Roman.

Generally speaking most mobile hydraulics operate between 2500 and 5000 psi. You should be able to find a line you can tap into with fittings to get a pressure reading. Usually axial piston pumps are used instead of gear pumps because they are a lot more efficient at pressures 3000 psi and higher.

that is the most effective way. well say hydman1.

With my broken English I would assume the bucket (tara 50 tons) shall be lifted by a piston like hydraulic in vertical direction - like a car is lifted in the repair shop.

If true you first have to determine what kind of hydraulic jack is available to provide the required lifting distance. The jack need to be mechanically stable to be loaded by 50 tons (for security possibly the double is required --> there are specifications for mining equipment? I would assume!).

Above constrains probably will reduce the number of suitable jack designs.

The final operating pressure strongly becomes related by the total load and the effective piston diameter of the hydraulic cylinder (jack):

p(ressure) = F(orce) / A(rea of piston)

However, additional pressure might be required to cover additional forces (load) from inertia of load against accelleration (F = m(ass) x a(ccell)), friction in the system, etc.

Someone may favorite high pressure equipment, because of its small sizes - but then limited to small lift rates and sensitivity against oil leakage from joints and piston seals. In case the whole lifting arrangement already would require a minimum mechanical structure (e.g. you can't lift 50 tons 2 m high with a hydraulic cylinder of 2 inch piston diameter - you probably would need a diameter of 10 inch or more. Then it makes no sense to prefer high pressure equipment - maybe max.50 bars are sufficient. Using pressure below 120 bars a lot of pricy pump equipment is available at the hydraulic component market. E.g. electric driven gear type pump, valves for ensuring soft start and end of the lifting (or positioning), flex hoses, fittings and pipes.

For supply pressure above 180 to 200 bar the matter becomes more selective and expensive.

regards