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PPT : Hydraulic Safety – Colorado Mine Safety Training Program
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Force is expressed in lbs. Area is expressed in in² Pressure is expressed in PSI
The FORCE of the cylinder in lbs. Is the system pressure multiplied by piston area…remember this area is round
The area of a circle is: A = p r²
Lets assume this cylinder is 4” in diameter
The area of this PISTON is 3.14 x 4 or 12.5 sq. in
Lets assume the system pressure is 1000 psi
This cylinder WILL produce 1000 x 12.5 or 12500 lbs of FORCE!
This area is known as the major area
When system pressure is applied to the closed end and the rod end is restricted, pressure intensification occurs
1325 PSI is within the rod end of this cylinder when the rod end port is restricted and system pressure is applied to the closed end of the cylinder!
Another Scenario
5 “ cylinder 4 “ rod working under 2200 PSI
Major Area = 19.6 Rod Area = 12.5 Minor Area = 7.1 Force = 19.6 x 2200 or 43120 lbs Intensified Pressure = 43120 ÷ 7.1 or ??
[member]
What could cause a rod end port to be restricted?
Would you like to be working near this cylinder if this condition existed?
Where might you find this type of cylinder?
Types of restrictions include:
Hose restriction\complete blockage Hard pipe damage Ball valve or gate valve INSTALLATION Foreign objects/contamination
What can WE do to minimize exposure to this HAZARD?
Be thorough when making Equipment Examinations
NEVER use a ball valve for controlling a hydraulic cylinder circuit
Don’t adjust any circuits’ pressure relief valve you may be setting yourself up for disaster
Repair or replace damaged components immediately Don’t wait until the maintenance shift
[/member]
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Category : Air and HydraulicSource : mining.state.co.us
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Tags: ball valve, hydraulic cylinder, pressure relief valve, safety training