Fluid Formulas

We’ve listed the most common hydraulic fluid formulas, such as velocity through piping, compressibility of oil or fluid, specific gravity, flow factor, and viscosity. Looking for more information about hydraulic pumps? Need a hydraulic repair service? Contact us today!

Hydraulic Fluid Formulas

Hydraulic Fluid Formulas For: Word Formula Letter Formula
Velocity Through Piping
In Feet/Second Velocity
Velocity =velocity fluid formulas V = velocity
Compressibility of Oil
In Additional Required Oil To Reach Pressure
Additional =
add volume formulaVolume
VA = add_volume
* Approximately 1/2 % per 100 psi
Compressibility of a Fluid Compressibility =compressibility fluid formula C(ß)=compressibility formula
Specific Gravity of a Fluid Specific =
specific gravity formulaGravity
SG =specific_gravity
Valve (Cv) Flow Factor Valve Factor (Cv) =
valve factor cv
Cv = valve_factor_cv
Viscosity in Centistokes For Viscosities of 32 to 100 Saybolt Universal Seconds:
Centistokes = .2253 x SUS – centistokes
CS = .2253 SUS –centistokes
Viscosity in Centistokes For Viscosities of 100 to 240 Saybolt Universal Seconds:
Centistokes = .2193 x SUS – centistokes
CS = .2193 SUS –centistokes
Viscosity in Centistokes For Viscosities Greater Than 240 Saybolt Universal Seconds:
Centistokes = centistokes
CS = centistokes

HYDRAULIC FLUID FORMULAS NOTE: Saybolt Universal Seconds is often abbreviated SSU.