Pipe Rating

Pipe Rating for Single Phase Incompressible Flow

Important Notices:

The pipe rating procedure presented here applies to Newtonian fluids which are incompressible and single phase in isothermal and steady-state flow situations. The friction factor is calculated rigorously from the original Colebrook equation. Piping pressure drop and sizing are treated elsewhere.

A more comprehensive and powerful version of this procedure is available online through Process Associate's clients gateway (password required). WWW-based and Stand-alone versions of the full program for Windows 3.1x/95/NT and Unix operating systems are available through their coordination office. The full version of this procedure is part of their Process Designer® line of intelligent software.

For your convenience, The input form below has several multiple choice fields {using radio buttons} with one field already selected as default. Please make sure that you always mark the proper button corresponding to your input if it is different from the default.


Rating Criterion
Allowable	Pressure drop
Allowable	Head loss

Fluid's Physical Properties
	Density
	Viscosity

Piping
Length
Diameter	Nominal, inches ⁽¹⁾	Schedule⁽²⁾
Diameter	Inside / equivalent

Condition	New/clean	(Server will calculate roughness)
	Fouled, abs. roughness
	Fouled, rel. roughness
	Fouled, typical⁽³⁾	(Server will calculate roughness)

Report:
Maximum	Mass flowrate in
	Volume flowrate in
	Velocity in

Notes:

For commercial steel pipes only.

The schedule list is all inclusive. Hence, some of the pipe schedules shown are not available for every nominal pipe size. If you select an invalid nominal pipe size and schedule combination, the server will return a list showing which schedules are available for the nominal pipe size you specified. We apologize for this awkward behavior but it is due to current HTML and browser technology limitations.

A Process Associates proprietary correlation reflecting typical "old" piping roughness is used. The correlation is derived from refinery data for steel piping in "clean" gas and liquid services.