Reference:  Flow of Fluids – Technical Paper No 410, 1988, Crane Co. Page 4-5, Example 4-9.


Pipe Flow Expert File: Case_34_SAE_70_Lube_Oil_Laminar_Flow_In_Valves.pfe


Problem Description: 

A piping system consisting of 5” diameter steel pipe (schedule 40) carries SAE 70 Lube Oil at 100°F. 

The flow rate is 600 gpm (US).

The piping includes a 5” gate valve and a 5” angle valve.


Find the fluid velocity and the pressure loss across the system.


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Fluid Data: SAE 70 Lube Oil at 100°F


Result Comparison: 


Data Item

Published data

Pipe Flow Expert

Pressure Loss (psi)

56.6

56.6014 (100.000 - 43.3986)

Fluid velocity in pipe (ft/s)

9.60

9.622

Reynolds Number

718

719

Friction factor

0.089

0.08903


Commentary: 

The published data and the calculated results compare well.

The system was modeled in Pipe Flow Expert with a fluid surface pressure of 100.00 psi g at the inlet to the system. 

The outlet node had a resulting pressure of 43.3986 psi g.

The pressure difference is obtained by subtracting the outlet pressure from the inlet pressure.