What does PSI mean?

What does PSI mean in plumbing terms? What is the importance of PSI?

Asked by jonathan on 11th Nov 2021
Expert Trade Answers
"Psi stands for pounds per square inch. Its a unit of measurement ie a certain pressure in your car tyre for example"
Answered on 11th Nov 2021 - Member since Aug 2021 - report
"Water pressure is measured in pounds per square inch–also known as psi"
Answered on 2nd Apr 2022 - Member since May 2021 - report
"It's a pressure measurement: Pounds per Square Inch. 14.5 psi is roughly equivalent to 1 bar."
Answered on 19th May 2022 - Member since May 2022 - report
"Psi in plumbing means.
Pounds per square inch.
Thank you."
Answered on 28th Dec 2021 - Member since May 2021 - report
"Pounds per square inch
It's a unit to measure pressure."
Answered on 6th Dec 2021 - Member since Nov 2021 - report
"Its the measurement of Pounds per square inch in pressure value."
Answered on 11th Nov 2021 - Member since Jan 2021 - report
"I think it means Pounds per Square Inch, but most boilers and pressurised water systems use the European term “Bar”
It’s like tyre pressure, in a car manual it normally quotes Bar and PSI
It’s a unit of pressure normally related in the plumbing world as the water pressure of the incoming supply, boiler radiator pressure etc. I am not a fully qualified plumber and only do minor plumbing repairs, so it might stand for something else?"
Answered on 11th Nov 2021 - Member since Aug 2017 - report
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