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Malcolm · 16th November 2004, 06:46 AM

Thanks for the thoughts Bill, but don't agree with your conclusion! My system is a pressurised system with expansion bladders etc built in already. UK ratings for equipement typically cope with 3 bar as the standard. My inlet pressure was 5 bar (70 psi) and that is too much so it was reduced at the mains water in point as mentioned. Maybe the UK/USA language barrier has kicked in as I do not know what # means as a unit.

The shower unit used is not an environmentally friendly one. It can shift 15 gallons a minute! Having a deep bath uses less water than a 5 minute shower.

My thoughts are that the seal on the shower head is just over its operational tolerances. Hence it fails as the weak link in the system. I wish to reduce the work it has to do by releiving its work load. Letting the water out of the shower head more quickly by increasing the jet hole sizes should do this. Clearly this could be done by trial and error but I thought I woukld see if there was known a mathematical engineering way first. There has to be but who knows it?

If this is a linear solution then as you increase hole size, pressure drops accordingly when volume remains static. But I suspect it isn't linear. Water temperature is fixed in this discussion as I have a stop on the theormostatic valve at 38 C which is before the shower head.

This has to be similar to air flow into your engine to exhaust gases flow out (but without all the complications of combustion)? Or venturi in aerodynamics?

Just a bit of fun. Shame Wendy's maths is terrible, otherwise I could encourage her into the shower with me to work this one out!!!!! Hey ho.

PS Is Bar a metric measuremnt? I think metric equvalent is Kn/m sq. Lets not go there. [img]/ubbthreads/images/graemlins/smile.gif[/img]

16th November 2004, 06:46 AM	#3 (permalink)
Malcolm Malcolm Gold Supporter Join Date: Jun 2003 Location: Surrey, UK GT40: GTD Posts: 2,251	Re: Hydraulic engineering advice needed! Thanks for the thoughts Bill, but don't agree with your conclusion! My system is a pressurised system with expansion bladders etc built in already. UK ratings for equipement typically cope with 3 bar as the standard. My inlet pressure was 5 bar (70 psi) and that is too much so it was reduced at the mains water in point as mentioned. Maybe the UK/USA language barrier has kicked in as I do not know what # means as a unit. The shower unit used is not an environmentally friendly one. It can shift 15 gallons a minute! Having a deep bath uses less water than a 5 minute shower. My thoughts are that the seal on the shower head is just over its operational tolerances. Hence it fails as the weak link in the system. I wish to reduce the work it has to do by releiving its work load. Letting the water out of the shower head more quickly by increasing the jet hole sizes should do this. Clearly this could be done by trial and error but I thought I woukld see if there was known a mathematical engineering way first. There has to be but who knows it? If this is a linear solution then as you increase hole size, pressure drops accordingly when volume remains static. But I suspect it isn't linear. Water temperature is fixed in this discussion as I have a stop on the theormostatic valve at 38 C which is before the shower head. This has to be similar to air flow into your engine to exhaust gases flow out (but without all the complications of combustion)? Or venturi in aerodynamics? Just a bit of fun. Shame Wendy's maths is terrible, otherwise I could encourage her into the shower with me to work this one out!!!!! Hey ho. PS Is Bar a metric measuremnt? I think metric equvalent is Kn/m sq. Lets not go there. [img]/ubbthreads/images/graemlins/smile.gif[/img]