Pipe Network Problem Solving Through Graphical Method

I'm very rusty on all this.

Here is a half-baked thought to simplify your diagram; Replace line 6 with 2 equivalent parallels (6a and 6b). Do the same for line 4. End result will be a set of parallel fed by line 1. Probably complete nonsense, but it might inspire an alternate approach.

On reflection, that is gibberish. How about making a delta-star conversion of lines 2, 3, and 5.

Consider the junction 3x5 connected to outlet of 6 via 4 if both tanks are at same pressure.

Let me introduce you to the Hardy Cross Method: http://en.wikipedia.org/wiki/Hardy_Cross_method

1. Sum of the flows into and out of any node must be zero.

2. Sum of the pressure loss in any loop must be zero. (Don't forget to account for static head changes due to elevation.)

3. Make an initial assumption for flows, calculate pressure losses, adjust flows, repeat until 1. and 2. are met. Then you have one point on your system curve.

4. Make new initial flow assumptions with different values, repeat and you have another point. How many points do you want?

30+ years ago I had to do this manually for the plant firewater system. Today, you could use a spreadsheet or one of the computer programs available that include loop analysis.

Thank you sir for your input. I'l go through that method and comeback to you sir.

Run #2 is not needed.

Thanks for your reply sir.And in Line 2, there will be another taping of flow to another tank which i've removed for the purpose of simplicity.

Graphic solutions may be more (((visual))), but they are intrinsically only approximate solutions. More importantly, there is no substitute for a properly detailed analysis, other than a better detailed analysis...

First of all, it should be pointed-out that you don't have just one problem to solve, but you do have at least four (relatively) simple situations to analyse (ie: 1-2-6, and 1-3-5-6, if your're going to discharge only into tank #2;

1-3-4, and 1-2-5-4, if you're going to discharge only into tank #1), and, at least two more complex situations, if you're going to simultaneously discharge into both tanks.

You should be concerned with evaluating at least the four simple system curves, at the very least.

Second, where is/are the valve(s), of what size(s), of what type(s), etc.

Same goes for other fittings, conduits, elevation changes, exposure conditions, etc.

Readily available commercial software would help you ask the proper questions to get started...