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Tech Details
Failure of seals
Improper installation is a major cause Of hydraulic seal failureHydraulic system contamination is a another major factor in Hydraulic seal failureChemical breakdown of the seal material is most often the result of incorrect material
Contamination Affect A Hydraulic Components
Particle contamination accelerates wear of hydraulic components. The rate at which damage occurs is dependent on the internal clearance of the components within the system, the size and quantity of particles present in the fluid, and system pressure.
Particles larger than the component's internal clearances are not necessarily dangerous. Particles the same size as the internal clearances cause damage through friction. However, the most dangerous particles in the long term are those that are smaller than the component's internal clearances.
Particles smaller than 5 microns are highly abrasive. If present in sufficient quantities, these invisible 'silt' particles cause rapid wear, destroying hydraulic pumps and other components.
Fluid Power Formulas
Formula For:
Word Formula:
Letter Formula:
FLUID PRESSURE in Pounds/Square Inch
FORCE (pounds)
PRESSURE = -----------------------------------
UNIT AREA (Square Inches)
F or F
P = -------- PSIG = -------
A A
FLUID FLOW RATE in Gallons/Minute
VOLUME (Gallons) FLOW RATE = ------------------------- UNIT TIME(Minute)
V
Q = --------
T
FLUID POWER IN
HORSEPOWER
PRESSURE (PSIG) X FLOW (GPM)
HORSEPOWER = ----------------------------
1714
PQ
HP = --------
1714
VELOCITY THROUGH PIPING in Feet/Second Velocity
0.3208 x FLOW RATE THROUGH I.D.(GPM)
VELOCITY = -----------------------------
INTERNAL AREA (Square Inches)
.3208Q
V = ---------
A
COMPRESSIBILIT Y OF OIL in Additional Required Oil To Reach Pressure
PRESSURE (PSIG) X VOLUME OF OIL
UNDER PRESSURE
ADDITIONAL VOL = ----------------------------
250,000 (approx.)
PV
VA = ------------
250,000
COMPRESSIBILIT Y OF A FLUID
1
COMPRESSIBILITY = --------------------
BULK
MODULUS OF
THE FLUID
1
V = -----
BM
SPECIFIC GRAVITY OF A FLUID
WEIGHT OF ONE
CUBIC FOOT OF
FLUID
SPECIFIC GRAVITY = -----------------------
WEIGHT OF ONE
CUBIC FOOT OF
WATER
