Re: [PipingDesign] a tank ventilation problem

From: <umesh>
Date: Mon Nov 13 2006 - 00:52:00 EST

Emre,

There are many equations to size the Air piping..

Here is one
Pressure drop in bar = (KLQ2)/(R*d5,3)
Where

K = 800
L = Length of pipe in metres
Q = The volume of free air in dm3/s passing through the pipe.
R = The ratio of compression at the beginning of the pipe (Check your blower

data to find air exit property)
d = The internal pipe diameter in mm

This is from SPIRAX SARCO.
dm^3/s is Cubic decimeters per second
Calculate yourself to find "Q"

Rgs,

Umesh Ken.,Senior Piping Specification Engineer, Alcan Engineering Pty. Ltd., Brisbane, QLD, Australia

Favorite saying:
"Our lives begin to end the day we become silent about things that matter"? ........... Dr. Martin Luther King, Jr

• Original Message ---- From: Emre OZTURK <silent_and_deep@yahoo.com> To: PipingDesign@yahoogroups.com Sent: Sunday, November 12, 2006 9:28:12 PM Subject: [PipingDesign] a tank ventilation problem

Hello every body,

I have a problem, and need some help. i tought maybe someone in this group can help me.

In a tankership there are dn250 (10") pipelines from manifold to tanks sized to convey fuel. Now i need to blow warm air to tanks using the same pipeline. For this purpose we will buy a 30000 m^3/h 1500 pascal capacity warm air fan. the fuel lines have connection to a 1000x1000mm ventilation duct manifold as seen in the figure attached to this e-mail.

I want to calculate the pressure drop in the dn250 pipeline. But for calculating this i know that a dn250 pipeline can not transfer 30000 m^3/h. So i can not define the velocity parameter in the pressure drop formula. How much air can be transferred through a dn250 pipe line under 1500 pascal static pressure. Can anyone help me?

Please see the attached jpeg single line diagram for the system i m planning to build.

Thanks alot
Emre OZTURK
Naval Architect

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Received on Mon Nov 13 00:52:00 2006