On Fri, 26 May 2017 11:25:07 -0700, wrote:

If a centrifugal pump with a maximum pressure of, say, 10 psi is
supplied with water at 80 psi will the water pressure coming out of
the pump be 90 psi? I think the pressure will be 90 psi. Am I wrong?
Thanks,
Eric

Depends entirely on the particular pump. Some pumps can suck from
atmosphere once primed. Other pumps require a Net Positive Suction
Head (pressure on the inlet). How much pressure the pump will add
depends on the pump characteristics and how much flow you're
demanding. A data sheet on the pump will give you this information.

John
John DeArmond
http://www.neon-john.com
http://www.tnduction.com
Tellico Plains, Occupied TN
See website for email address