Hi,
We are considering a major overhaul for a chemical injection skid. The tanks are 2.5 meters high with the low low level alarm set at 200 mm. The injection pump are installed at an elevated level of 100 mm above tank bottom, so the suction line goes up around the same height.
1. If the suction pressure at the pump suction nozzle is around 70-80 kPaa. is that ok given it's below atmospheric pressure yet not complete vacuum?
2. Can I account for some syphon effect in the suction line since the line starts from the bottom of the tank, extends to the skid limit then goes up to the pump suction nozzle?
Thanks
Sherif