Title and Link to Calc:
Description:
Calculates discharge rate of a compressible fluid through a piping
system using the methods indicated in examples, 4-21 and 4-22, from
"Flow of Fluids Through Valves, Fittings, and Pipe", 1988 (reprinted
12/01).
Alternative Descriptors:
Adiabatic Flow through Short Lengths of Pipe
Gas / Vapor flow through Short Lengths of Pipe
Calc Number:
CFF-CRFOF-42122-1
Calc Status:
Beta
Reference:
Flow of Fluids Through Valves, Fittings, and Pipe, 1988
(reprinted 12/01), Crane Co.
Reference Example(s) Modeled/Generalized:
Example Number(s): 4-21,4-22 of above reference
Calc Origination Date:
02/09/2006
Calc Originator:
RBC
Calc Revision History:
None
Calc Guidelines:
User should refer to the specified reference above. Refer to examples 4-21 and 4-22. This calc is a generalization of these examples.
Access:
Activating this calc requires entry of the correct access code.
Contact eng-calc@eng-calcs.com
to obtain the access code.
Variables:
Variable Description - Description of the variable
Variable Label Description - The description of the variable as it appears in the calc.
Variable Calc Name - The calc internal variable name
Variable Units - The units for the variable
Variable Calc Upper Limit - The highest allowed value in the calc.
Variable Calc Lower Limit - The lowest allowed value in the calc.
Variable Type - Either "Output" or "Input"
Variable Format - Real Number, Text, or Integer
Variable Notes - Other comments about the variable
Variable Description: Discharge Rate from
Piping System
Variable Label Description: Discharge Rate
Variable Calc Name: DRLM
Variable Units: SCFM
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type:Output
Variable Format:Real Number
Variable Notes:
Variable Description: Ratio of Pressure
Drop to Upstream Pressure
Variable Label Description: [Delta P]/[Upstream P] ratio:
Variable Calc Name: DPRA
Variable Units:
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type:Output
Variable Format:Real Number
Variable Notes:If this value exceeds MPRS below, then MPRS is used in the flow calculation.
Variable Description: Maximum Pressure
Ratio For Piping System
Variable Label Description: Maximum Pressure Ratio for System
Variable Calc Name: MPRS
Variable Units:
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type:Output
Variable Format:Real Number
Variable Notes:The maximum pressure ratio is the point where sonic velocity is achieved at the discharge of the piping system. If sonic velocity occurs, then the downstream pressure used in the flow equation is determined from this value.
Variable Description: Net Expansion Factor
Variable Label Description: Net Expansion Factor
Variable Calc Name: NEF
Variable Units:
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type:Output
Variable Format:Real Number
Variable Notes:
Variable Description: Comments
Variable Label Description: Comments
Variable Calc Name: COM
Variable Units:
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type:Output
Variable Format:Text
Variable Notes: Displays "Input(s) out of
range." if an entered input variable(s) are out of range. Displays
"Output(s) out of range." if an output variable exceeds its range. The
"out of range" variable(s) are displayed in yellow.
The limited range values are used in the calculation, not the "out of
range" value(s).
Displays "Sonic Velocity" when sonic velocity occurs at the end of the piping system. Displays "Subsonic Velocity" when velocity is subsonic at the end of the piping system.
Variable Description: Scenario
Description
Variable Label Description:Scenario
Description
Variable Calc Name: RSD
Variable Units:
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type:Input
Variable Format:Text
Variable Notes:User determined
description. Has no effect on calculation.
Variable Description: Pipe Internal Diameter
Variable Label Description: Pipe Internal Diameter
Variable Calc Name: PID
Variable Units: IN
Variable Calc Upper Limit:150
Variable Calc Lower Limit:0.01
Variable Type:Input
Variable Format:Real Number
Variable Notes:
Variable Description: K Value of Piping Discharge System
Variable Label Description: K Value of Piping Discharge System
Variable Calc Name: KVAL
Variable Units:
Variable Calc Upper Limit:100
Variable Calc Lower Limit:1.2
Variable Type:Input
Variable Format:Real Number
Variable Notes:
Variable Description: Fluid Specific Gravity Relative to Air
Variable Label Description: Fluid Specific Gravity (to air)
Variable Calc Name: FSG
Variable Units:
Variable Calc Upper Limit:500
Variable Calc Lower Limit:0.001
Variable Type:Input
Variable Format:Real Number
Variable Notes:
Variable Description: Upstream Temperature
Variable Label Description: Upstream Temperature
Variable Calc Name: UTEM
Variable Units: R
Variable Calc Upper Limit:1000
Variable Calc Lower Limit:1
Variable Type:Input
Variable Format:Real Number
Variable Notes:
Variable Description: Upstream Pressure of Piping System
Variable Label Description:Upstream Pressure
Variable Calc Name: UPA
Variable Units:PSIA
Variable Calc Upper Limit:20000
Variable Calc Lower Limit:0.01
Variable Type:Input
Variable Format:Real Number
Variable Notes:
Variable Description: Downstream Pressure (at discharge) of Piping System
Variable Label Description:Downstream Pressure
Variable Calc Name: DPA
Variable Units: PSIA
Variable Calc Upper Limit:20000
Variable Calc Lower Limit:0
Variable Type:Input
Variable Format:Real Number
Variable Notes:
Variable Description: Isentropic K
Variable Label Description:Isentropic K
Variable Calc Name: ISK
Variable Units:
Variable Calc Upper Limit:1.4
Variable Calc Lower Limit:1.3
Variable Type:Input
Variable Format:Real Number
Variable Notes:Ratio of heat capacities (Cp to Cv)
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