Guestimating Water Pressure?

[ijc]

Hi all

Do any of you have a guestimating technique for roughly judging water pressure without a gauge?

The minimum recommended pressure for the mixer shower I'm looking at is 1bar, so I just wanted to do a rough check for confidence sake before ordering it....

Feel free to laugh at this point, but by my amateur reckoning, if a 15mm pipe can fill say a litre jug in X number of seconds, surely that correlates to the pressure?

Failing that, I know that when I top up the central heating pressure from the mains, the gauge on the boiler rises easily past 1bar when cold. Might this be enough evidence?

Yes I am lazy, but I'm also fed up of buying tools I hardly ever use!!!!

Cheers

Ian

 

[PTH]

Ian,

The rate of jug filling is not a proper indicator of pressure. The thressure is used to drive the volume of water through the resistance imposed by your pipes, valves and taps.

As a VERY rough guide; unless you are a champion arm wrestler or similar, if you can hold your thumb over the end of a mains fed tap without getting wet, you have less than 2 bar. Don't try this with a garden hose pipe, the flexibility of the pipe and it's resistance will negate your thumbs input. If you are a champion arm wrestler, get someone else to test it.

 

[oilman]

Too lazy to tell you, my times worth more than the cost of a gauge, why should it cost me to save you. Buy a gauge.

 

[ijc]

Cheers PTH. That tells me all I need to know!

Oilman - if it's any compensation for the time and trouble I've so obviously inflicted on you, just think of me with my thumb stuck up the tap, spraying water all around the house....

 

[ChrisR]

If you have a combi all your taps will probably be at mains presssure so you should be ok - in 95% od cases.

 

[traineegasman]

Too lazy to tell you, my times worth more than the cost of a gauge, why should it cost me to save you. Buy a gauge.

The case for the prosecution rests..........

Cheers PTH. That tells me all I need to know!

Oilman - if it's any compensation for the time and trouble I've so obviously inflicted on you, just think of me with my thumb stuck up the tap, spraying water all around the house....

GOOD CALL........

________________________
moderator

please note 10a

 

[oilman]

Go away gasman.........

 

[kevplumb]

will you pair bury the hatchet (pref not in each other ) this is getting silly

 

[oilman]

gasman has been silly since he turned up here. He then degenerated into abusing anyone who didn't fit his image of what everyone else should be like. A hatchet would be too good.

 

[traineegasman]

Gasman... thank you for accepting me as a fellow brethren...Oilman....I love you....

 

[Agile]

Back to the topic please!

I have always taken the thumb test to be at 1 bar. Perhaps I am weaker than the rest of you or maybe I just value my thumbs more.

With a combi boiler you can use the filling loop and pressure guage to see what is the maximum the mains can pressure the system to.

Easy ways out without specialised equipment. One day I will tell you the way to measure temperatures without your digital thermometer.

Tony Glazier

 

[ChrisR]

My right thumb holds water in a garden tap at 3 bar.

 

[Slugbabydotcom]

Gasman... thank you for accepting me as a fellow brethren...Oilman....I love you....

I suspect that was abbreviation rather than acceptance TGM

 

[traineegasman]

Wot is with these apparently `witty` wise, Hey, Dude`s I`m getting down with the kid`s at the bottom of every post, routine?.... tedious & embarrassing,...please stop..

 

[oilman]

....... tedious & embarrassing,.......

Describes most of your posts to a tee. Why are you not able to reply and keep to the topic. You either have to degenerate to abuse, attempt to impress women (and probably fail), or see if there's any takers on the other side. I suspect in practice, you have to resort to diy.

Could you possibly demonstrate your claimed intelligence and do a bit of sticking to the topic? Most regulars here post some witty replies now and again, but you constantly attempt to get noticed as if you want to be the star of "hells kitchen - (plumbing department)".

Now grow up.