Calculating PSI?

Question

I have a 1.5 horse power water pump with a 1 inch outlet at 75 gpm. I cant find any information of the PSI of the pump and I cant get a PSI gauge that will fit it without disassembling my current system and spending over 100 dollars. Is there anyway to calculate psi?

Answer 1

Can you check the manufacturer's website to see if they have any manuals for it online that would have it?  Even the older models usually have manuals available.  Or fine the maker's phone number on the website and call them - I've done it before in a similar situation, and they were really helpful.

Answer 2

I would check in at the Library!!!

There should be a book on how to calculate PSI...

Answer 3

Lets start with some basics. I assume you are talking about a [well] pump which delivers water to your house. Whatever the manufacturers spec, or the tables in a book at the library say, the only  way to find the ACTUAL psi of YOUR system [not a theoretical system] is to measure  the PSI of YOUR system. The PSI depends on MANY variables, so you cannot look it up or find it in an instruction book.  You need to put a pressure gauge into your system. They are not expensive. Whether you have steel pipe, plastic pipe, or whatever, you need to cut into the system [between the storage tank and your home distribution system], install a "TEE" fitting, and s***w a pressure gauge into the tee. This will give you an ACTUAL PSI reading...nothing else will. If your $100 estimate is from a plumber, that's not a bad price, assuming you have no plumbing knowledge, and no friends, relatives, etc. who can help. If you have help, get a gauge at a plumbing supply house or home store which is made to measure from zero to about 100 PSI, shut off the pump [cut the power to it] install the Tee and gauge, and turn it all back on. Check for leaks, read the gauge, and your set.

Answer 4

You can get a pressure gauge that screws on to a hose bib, or any hose thread, for less than $10.

Answer 5

Probably between 60 and 80 psi. Get a guage that fits the guage port and reads from 0 to 120 pis. Probably 3/8" with fine threads.