 Pressure Drop
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Calculations
Straight Pipe - user defined
Calculation of pressure drop through a straight pipe.
The diameter and wall roughness are user defined.
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Straight Pipe - ANSI
Calculation of pressure drop through a straight pipe.
The diameter and wall thickness can be selected from the ANSI tables.
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Straight Pipe - DIN
Calculation of pressure drop through a straight pipe.
The diameter and wall thickness can be selected from the DIN tables.
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Pipe with fittings - user defined
Calculation of pressure drop through a pipe with fittings.
The diameter and wall roughness are user defined. The number of fittings can be put in manually or
estimated by the calculation routine using a correlation based on complexity and average plant data.
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Pipe with Fittings - ANSI
Calculation of pressure drop through a pipe with fittings.
The diameter and wall thickness can be selected from the ANSI tables. The number of fittings can be put in manually or
estimated by the calculation routine using a correlation based on complexity and average plant data.
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Pipe with Fittings - DIN
Calculation of pressure drop through a pipe with fittings.
The diameter and wall thickness can be selected from the DIN tables. The number of fittings can be put in manually or
estimated by the calculation routine using a correlation based on complexity and average plant data.
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Information
Wall Roughness values
Tabulation of typical Wall Roughness for several materials in mm.
The data is useful for User Defined Pipe pressure drop calculations.
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Related Links
Line Sizing
Line Sizing calculations and information section of The Engineering Page.
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American National Standards Institute
The American National Standards Institute (ANSI) is a private, non-profit organization (501(c)3)
that administers and coordinates the U.S.
voluntary standardization and conformity assessment system.
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Deutsches Institute fuer Normung
The main activity of DIN is the development of technical rules.
The objective of DIN is to create standards for the benefit of the economy and of society as a whole.
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Beuth Verlag
DIN Standards ISO Standards; VDI Guidelines, DVS-M/R; ASTM-, ASME BPVC-, IEEE-,
SAE-Standards (US); JIS-Standards (JPN) and publications of Beuth Verlag
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Literature
Fluid Mechanics
R.A. Dodge & M.J. Thompson
McGraw-Hill Book Company inc., 1937
Elementary Mechanics of Fluids
H. Rouse
John Wiley & Sons, New York, 1946
Friction Factors for Pipe Flow
L.F. Moody
Transactions of the American Society of Mechanical Engineers, volume 66, Nov 1944
Pages 671 to 678
The two-K method predicts head losses in pipe fittings
W.B. Hooper
Chemical Engineering, Aug 1981
Pages 96 to 100
The pressure drop of fittings are predicted using this method, which is the best we've seen
as it is valid for laminar and turbulent flow.
How to predict pressure drop before designing the piping
G.S. Brown
Chemical Engineering, Mar 1987
Pages 85 to 86
This article contains correlations for anticipated numbers of fittings.
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