Tie-in to process headers

[Easterly_Tiger]

I am looking to tie in to a water return header but I believe that the pressure from the tie in point might dead head the other line. What do y'all think? I have attached an image of the process.

This application is basically mixing two steams at different pressure (may or may not have same flow) and then returning it to an atmospheric tank. The tanks is about 100' away.

 

[mk3223]

It's weird that there is a flow at lower pressure stream. Not making sense!
Were the pressure gauges calibrated correctly?

 

[MortenA]

Flow always goes towards the lowest pressure (in this case atm), and at an intersection the two stream will have the same pressure (no matter what you numbers say). If you upstream pressure and flow rates are given by the numbers on your iso, then either the flow rates or the upstream pressure will change. You just cant have a discontinuity.

 

[Iomcube]

mk3223 is right why you have two different pressures from the same supply?