@1gibson "ask the manufacturer" isn't exactly a constructive response. The user has posted on here to gain some thoughts and ideas, if they wanted to ask the manufacturer they would have. These forums are for help, and while I agree in this instance more information is required, we should...
I agree with LittleInch regarding the cavitation concerns. The vapor pressure of your liquid shall be equal to the headspace pressure as you will be in equilibrium with the liquid and vapor phases. However that being said you do have 20ft worth of static head and I wouldnt expect the NPSHr of...