Piping Check Valve Minor Loss Factor

Calculate typical liquid check valve friction factor, flow coefficients and minimum flowrate.

The minimum flowrate is the flowrate required to keep the check valve fully open. For full port valves the valve port cross section area equals the nominal internal cross section area. For reduced port valves the valve port cross section area is less than the nominal internal cross section area. For circular valve ports the diameter ratio is equal to the valve port diameter over the nominal inside diameter. For non circular valve ports, use the square root of the internal area ratio (the square root of the valve port area over the nominal internal area).

The dimensionless flow coefficient Cv* equals Cv-us / IDin^2, where IDin is the valve inside diameter in inches. The flow factors are applicable for low velocity flow (choking can occur at high flow velocity due to cavitation and flashing). The calculated values are typical. Manufacturers data should be used if it is available.

Reference : Crane Technical Paper 410M Metric Version : Flow Of Fluids Through Valves, Fittings And Pipe

Tool Input

• schdtype : Pipe Schedule Type
• diamtype : Pipe Diameter Type
  • ODu : User Defined Outside Diameter
  • IDu : User Defined Inside Diameter
• wtntype : Wall Thickness Type
  • tnu : User Defined Wall Thickness
• rfactype : Pipe Roughness Type
  • εu : User Defined Surface Roughness
  • rru : User Defined Relative Roughness
• vktype : Valve Type (Fully Open Valve)
• angtype : Transition Angle Type (Gate Ball Butterfly And Disk Check Valves Only)
  • Φu : User Defined Transition Cone Angle
• factype : Friction Factor Type
  • D1/D2 : User Defined Valve Port Diameter Over Valve Diameter Ratio
• ρ : Fluid Density

Tool Output

• ε : Pipe Internal Roughness
• Av : SI Flow Coefficient
• Cd : Discharge Coefficient
• Cv* : Dimensionless US Flow Coefficient (Cv-us / IDin^2)
• Cv-met : Metric Flow Coefficient
• Cv-uk : UK Flow Coefficient
• Cv-us : US Flow Coefficient
• ID : Pipe Inside Diameter
• IDin : Valve Inside Diameter (inches)
• K : Friction Factor Or Resistance Factor
• Kv : EU Flow Coefficient
• Mmin : Minimum Fluid Mass Flow Rate
• Qmin : Minimum Fluid Volume Flowrate
• Vmin : Minimum Fluid Velocity
• fr : Pipe Roughness Factor
• rr : Pipe Relative Rougness
• vm : Fluid Specific Volume

Calculate pipe fitting inside diameter and inside cross section area from pipe diameter and wall thickness.

Use the Result Table option to display a table of the inside diameter and cross section area versus either outside diameter or wall thickness.

Tool Input

• schdtype : Schedule Type
• diamtype : Diameter Type
  • ODu : User Defined Outside Diameter
  • IDu : User Defined Inside Diameter
• wtntype : Wall Thickness Type
  • tnu : User Defined Wall Thickness

Tool Output

• AX : Pipe Inside Cross Section Area
• ID : Nominal Inside Diameter
• OD : Nominal Outside Diameter
• OD/tn : Diameter Over Wall Thickness Ratio
• tn : Nominal Wall Thickness

Calculate pipe fitting gas velocity and flow rate.

The gas specific gravity is the ratio of gas density over the density of dry air at base temperature and pressure. The compressibility factor is assumed to equal 1 at the base conditions. The gas specific gravity is proportional to the gas molar mass.

Tool Input

• schdtype : Pipe Schedule Type
• diamtype : Pipe Diameter Type
  • ODu : User Defined Outside Diameter
  • IDu : User Defined Inside Diameter
• wtntype : Wall Thickness Type
  • tnu : User Defined Wall Thickness
• fluidtype : Gas Type
  • SGu : User Defined Gas Specific Gravity
• voltype : Gas Flowrate Type
  • Qfu : User Defined Gas Volume Flow Rate
  • Mfu : User Defined Gas Mass Flow Rate
  • Ngu : User Defined Gas Mole Flow Rate
  • Vfu : User Defined Gas Velocity
• P : Gas Pressure
• T : Gas Temperature
• Z : Gas Compressibility Factor

Tool Output

• ρ : Gas Density
• ID : Inside Diameter
• M : Gas Molar Mass
• Mf : Gas Mass Flowrate
• Ng : Gas Mole Flowrate
• Qf : Gas Volume Flowrate (At T P)
• R : Gas Constant
• SG : Gas Specific Gravity
• Vf : Gas Velocity
• vg : Gas Mole Volume (At T P)

Calculate pipe fitting steam table properties from temperature and pressure.

Steam table values can be calculated for water and steam, saturated water, saturated steam, saturated water and steam, metastable water, and metastable steam. The calculations for water and steam are valid between 273.15 K and 1073.15 K (0 to 100 MPa), and between 1073.15 K and 2273.15 K (0 to 50 MPa).

The saturated water and steam calculations are valid between 273.15 K and 647.096 K.

The metastable calculation is valid between 273.15 K and 647.096 K, and for pressure from the saturated vapour line to the 5% equilibium moisture line (user defined). Use the Result Plot option to plot the steam properties versus temperature and pressure.

Note : There is an anomaly in the steam calculation for region 3 between the saturated vapour line, the regions 2/3 boundary, and the critical pressure. Refer to the region 3 anomaly help page for more details (click the utility button on the data bar). IAPWS R7-97 is intended for industrial use, and is a simplified version of IAPWS R6-95 for scientific use. IAPWS R7-97 was developed as an improvement of the IFC-67 model.

Reference : IAPWS R7-97 Industrial Formulation for thermodynamic Properties of Water and Steam

Tool Input

• anomtype : Region 2/3 Anomaly Type
• proptype : Steam Phase
  • Pu : User Defined Pressure
  • Tu : User Defined Temperature
  • Xu : User Defined Saturated Steam Quality

Tool Output

• ρ : Density
• Cp : Specific Heat Constant Pressure
• Cp-Cv : Delta Specific Heat (Cp - Cv)
• Cp/Cv : Specific Heat Ratio
• Cv : Specific Heat Constant Volume
• P : Pressure
• T : Temperature
• Vc : Speed Of Sound
• Z : Compressibility Factor
• cvg : Convergence Check
• h : Enthalpy
• s : Entropy
• u : Internal Energy
• vg : Mole Specific Volume
• vm : Specific Volume
• wv : Specific Weight