How to measure water pressure ??

rimexboy · Post: # 91529Post **rimexboy** Fri Jul 12, 2013 7:24 am

I need to find out the water pressure of an outside tap.

Can I do this by turning it on fully and catching the water in a container and then measure the amount of water in litres?

Ta Simon

Post: # 91532Post **msh paving** Fri Jul 12, 2013 9:07 am

you can buy a gadget that ataches to the tap turn it on and tells pressure, ive seen them in shops but forgot where..lol MSH

rimexboy · Post: # 91535Post **rimexboy** Fri Jul 12, 2013 10:51 am

msh paving wrote:you can buy a gadget that ataches to the tap turn it on and tells pressure, ive seen them in shops but forgot where..lol MSH

like this

will that just screw on my outside tap I take it

TheRockConcreting · Fri Jul 12, 2013 11:35 am

your test with the bucket is for flow rate, anything above 15l/m is good.

rimexboy · Post: # 91537Post **rimexboy** Fri Jul 12, 2013 12:04 pm

TheRockConcreting wrote:your test with the bucket is for flow rate, anything above 15l/m is good.

Ok so I guess I get a empty bucket open the tap full and time it for 1 minute, then see how much water I have in litres, is that right??

I'm looking at putting in a grass watering system like This one

Any advice please

Thanks again

Post: # 91539Post **Dave_L** Fri Jul 12, 2013 1:03 pm

Plumbers merchants will stock water pressure gauges, not expensive.

TheVictorianCobbleCo · Thu Jul 18, 2013 2:12 pm

rimexboy wrote:
TheRockConcreting wrote:your test with the bucket is for flow rate, anything above 15l/m is good.

Ok so I guess I get a empty bucket open the tap full and time it for 1 minute, then see how much water I have in litres, is that right??

I'm looking at putting in a grass watering system like This one

Any advice please

Thanks again

your water pressure should be in the region of 2 bar, or about 28 pounds per square inch. Without a guage its difficult to check pressure. (for 2 bar pressure the water would rise approx. 20 metres vertically in a pipe of the same size). To establish whether your water system would work, work out the area of each outlet on your system that you plan -say 20 outlets with a 6mm internal dia. Total area will be X. The cross sectional area of your tap pipe is Y. If X is bigger than Y you pressure will drop, if not, the pressure will rise, giving better spray. (no allowance for pressure drop in the pipe.) Short version, this, shout if you don't come right. Alternatively Area = cfm over fpm, calculate for better than 1m/sec at outlet.