What elevations shall I put in the energy equation....?
What elevations shall I put in the energy equation....?
(OP)
... to get the total discharge head (TDH) of a pump? I mean, let say that my pump is higher than the end of the pipeline, and there are soe places lower than the end of the pipeline. Do I have to take both elevations (Z1 and Z2)as the lower and higher point in the pipeline in question? Or, what I have to do is, just, take the beginning and the end of the pipeline for Z1 and Z2 elevations? This is the formula: Z1+P1/ghama+v^2/2g+Hp=Z2+P2/ghama+v^2/2g+Hm+Hf where "Z1" and "Z2" are elevations, "ghama" is the water density, "g" is the gravity acceleration, "Hm" is the minor losses, "Hf" is the friction losses, "P1" and "P2" are the pressures, and "V1" and "V2" are the water velocity.
Also, do anyone knows what is the kinematic viscosity of the sanitary water? I wander if it's the same as the water kinematic viscosity.
Also, do anyone knows what is the kinematic viscosity of the sanitary water? I wander if it's the same as the water kinematic viscosity.





RE: What elevations shall I put in the energy equation....?
For friction loss you have to consider length, bends, valves etc.
Steven van Els
SAvanEls@cq-link.sr
RE: What elevations shall I put in the energy equation....?
From your problem statement, my guess is u have a pit or vessel in which u have to pump out slurry or effluent water. you should take the bottom of the pit for Z1 and the end of the discharge pipe as Z2, this gives you a margin of safety in selecting your pump.
the viscosity of sanitary water,are u talking about greywater, blackwater(toilet flush) but it should not make that much of a difference if u use regular value of water after all u must be using to figure out the Re#.
good Luck