Recommended Delivery Flow Velocity of Viscous Liquids

As a rule of thumb the following velocities can be used in design of piping and pumping systems for viscous liquids:
[TABLE="class: medium"]
[TR]
[TH="colspan: 2"]Pipe Dimension[/TH]
[TH="colspan: 2"]Viscous Liquids[/TH]
[/TR]
[TR]
[TD][I]inches[/I][/TD]
[TD][I]mm[/I][/TD]
[TD][I]m/s[/I][/TD]
[TD][I]ft/s[/I][/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]25[/TD]
[TD]1[/TD]
[TD]3.5[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]50[/TD]
[TD]1.1[/TD]
[TD]3.6[/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]75[/TD]
[TD]1.1[/TD]
[TD]3.7[/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]100[/TD]
[TD]1.15[/TD]
[TD]3.8[/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD]150[/TD]
[TD]1.2[/TD]
[TD]3.9[/TD]
[/TR]
[TR]
[TD]8[/TD]
[TD]200[/TD]
[TD]1.2[/TD]
[TD]4[/TD]
[/TR]
[TR]
[TD]10[/TD]
[TD]250[/TD]
[TD]1.3[/TD]
[TD]4.5[/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD]300[/TD]
[TD]1.4[/TD]
[TD]4.5[/TD]
[/TR]
[/TABLE]

sir,
thanks for the information. I want to know in which book did you find that information.
Regards

[QUOTE=Esam;191544]As a rule of thumb the following velocities can be used in design of piping and pumping systems for viscous liquids:
[TABLE="class: medium"]
[TR]
[TH="colspan: 2"]Pipe Dimension[/TH]
[TH="colspan: 2"]Viscous Liquids[/TH]
[/TR]
[TR]
[TD][I]inches[/I][/TD]
[TD][I]mm[/I][/TD]
[TD][I]m/s[/I][/TD]
[TD][I]ft/s[/I][/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]25[/TD]
[TD]1[/TD]
[TD]3.5[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]50[/TD]
[TD]1.1[/TD]
[TD]3.6[/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]75[/TD]
[TD]1.1[/TD]
[TD]3.7[/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]100[/TD]
[TD]1.15[/TD]
[TD]3.8[/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD]150[/TD]
[TD]1.2[/TD]
[TD]3.9[/TD]
[/TR]
[TR]
[TD]8[/TD]
[TD]200[/TD]
[TD]1.2[/TD]
[TD]4[/TD]
[/TR]
[TR]
[TD]10[/TD]
[TD]250[/TD]
[TD]1.3[/TD]
[TD]4.5[/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD]300[/TD]
[TD]1.4[/TD]
[TD]4.5[/TD]
[/TR]
[/TABLE][/QUOTE]

Viscous liquids means to what "Reynolds number range" it applies.

Cheers,

duazo2009