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Equations and Calculations for Pressure

Water, Liquids, and Gas Pressure Relief Valves, Pipelines, Flow Meters

Pipes:   Pressure in pipe for liquid or gas flow    Water pressure in pipe    Pressure Relief Valve for Liquids 

Pipes with Pump and Pump Curve:   Pressure in pipe with pump curve for liquid or gas flow    Pressure in water pipe with pump curve 

Water Hammer:   Pressure due to water hammer with known valve closure or opening time    Pressure due to water hammer with instantaneous valve closure 

Compressible Gas Flow in Pipes:   Pressure for compressible gas flow     Pressure in choked gas flow 

Differential Pressure Flow Meters:   Pressure in venturi flow meter    Pressure in nozzle flow meter 

Pressure in small diameter orifice flow meter for liquids (Pipe Diameter, D<5cm)    Pressure in large diameter orifice flow meter for liquids (D>5cm) 

Pressure in small diameter orifice for gas flow (D<5cm)    Pressure in large diameter orifice for gases (D>5cm) 

Others:   Pipe network pressure    Pressure for bypass loop    Pressure in pipe elbow 

Pressure in Bernoulli equation    Discharge Coefficient (free) 

Pressure drop laminar flow (free)    Pressure loss 4000 ≤ Reynolds number ≤ 105 (free) 


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