Thanks for your help
Paul Bowers <pbowers@pipingdesign.com> wrote: "V= Recommended velocity of fluid". Careful with that, some fluids are less forgiving than others.
Paul
> Steps for calculation of pipe diameter :
>
> Step I : Calculate the approximate diameter of pipe on basis of
recommended velocity for the fluid. Using equation ; Q=AV.
>
> Here, Q = Flow rate of liquid, A = inner area of pipe, V= Recommended
velocity of fluid.
>
> Step II : Calculate the pressure loss in the system using formula
fenning's / Darcy's formula ; H=fLV2/2gd and P=?H
>
> Here, H= Head loss of fluid, f=friction factor which depends on surface
roughness for pipe, L=Equivalent length for piping comprising pipe fittings
& valves etc, d= Inner diameter of pipe, g=gravitational acceleration, V=
Recommended velocity of fluid, P=pressure drop, ?=Density of fluid
>
> Step III: Continue the above iteration till that pressure drop comes with
in acceptable limit for the system.
>
> Step IV : Having acceptable pressure drop use formula H=fLVa2/2gd again
to back calculate the actual velocity (Va).
>
> Step V: Use formula Q=Aa Va to back calculate the final annular / inside
area (Aa ).
>
> Step VI: Having inner diameter and pipe thickness (which is to be
separately calculated by strength calculation by using Tayler's formula or
relevant piping codes) outer diameter can be selected from dimensional
codes for pipe sizing e.g., ANSI B36.10/ANSI B36.19/ BS3600 etc.
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[Non-text portions of this message have been removed] Received on Fri Dec 12 02:39:00 2003
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