Draining a storage tank through attached piping.

[Wazobia]

Hi.

I am currently involved in a design involving a vessel which is to drain by gravity. I am trying to calculate the maximum velocity of flow [at maximum fluid height in tank]. Now i have seen a lot of papers and even answered posts on here about solving for discharge time through an orifice in the tank, but in my case there is associated piping which runs vertically about 1 metre from the bottom of the tank.

Any advice on this? My initial thought is to consider the head developed due to resistance in length of piping [and fittings] and compensate for that in the equation v = (sqrt)2*g*deltaH, i.e. effectively reducing the difference in height by a value equal to the head developed due to piping friction. Anyone have further experience with this?

Thanks.

 

[PEDARRIN2]

Use bernoulli's (sp) equation, density cancels on both sides, setting v1 at 0, z1 at top level of the tank, z2 at the bottom of the pipe discharge, calculate friction loss of the piping/fittings,valves and solve for v2.

 

[quark]

That is correct. This very topic was already discussed. Refer thread378-127152

 

[Wazobia]

Thank you for the help, much appreciated.