Hydraulic design w/ dead-end system
Hydraulic design w/ dead-end system
(OP)
Hello,
Does anyone have experience with hydraulic design in a dead-end system? Specifically, the application I am working on is for a branched process chemical supply system, with several reactors that will vary in demand quite a bit. To maintain pressure and keep the pump operating at a relatively constant point on its curve, we are considering a re-circ line back into the source tank.
I have been working on first-draft models using EPAnet...does anyone know of any other models that may prove more realistic, or does anyone have specific experience with this type of application? Thanks in advance for all of your input.
-Rick Jones
Does anyone have experience with hydraulic design in a dead-end system? Specifically, the application I am working on is for a branched process chemical supply system, with several reactors that will vary in demand quite a bit. To maintain pressure and keep the pump operating at a relatively constant point on its curve, we are considering a re-circ line back into the source tank.
I have been working on first-draft models using EPAnet...does anyone know of any other models that may prove more realistic, or does anyone have specific experience with this type of application? Thanks in advance for all of your input.
-Rick Jones
Rick Jones, EIT
Stearns and Wheler, LLC
www.stearnswheler.com





RE: Hydraulic design w/ dead-end system
The discharge flow controller can be set at the BEP of the pump, that way when the user demand falls below the BEP, the spillback valve will open. If the demand is higher than the BEP then the spillback will be closed and the pump will just run along its operating curve.
Operating at BEP will minimize wear on the pump (If you set the spillback rate at the vendor minimum flow setting, the pump will still vibrate and cause premature seal failure).
RE: Hydraulic design w/ dead-end system
RE: Hydraulic design w/ dead-end system
Excuse my ignorance!! What do you mean by "BEP" of the pump.
Brian
RE: Hydraulic design w/ dead-end system
Best Efficiency Point
RE: Hydraulic design w/ dead-end system
In my company we use a software developed internally and named FNESS. It was developed exactly to cope with large multiloop circuits as cooling water systems of petrochemical plants. We distribute a free version of FNESS in www.figener.com but such version has capacity to handling problems with a maximum of 6 nodes only. I think I can provide a larger version if you wish (free, at least for a certain while) Just let me know
Regards
fvincent
RE: Hydraulic design w/ dead-end system
Do not overlook the operating speed of the opening and closing of the branch valves to the reactors (water hammer).