Re: Water pressure measurement

[Sylvan Butler <ZsdbUse1+noZs_0504@xxxxxxxxxxxxxxxxxxxxx>]

On Fri, 15 Apr 2005 03:30:19 GMT, Gunnar <sorry@xxxxxxxxxx> wrote:
> "AutomatedOutlet.com" <Martin@xxxxxxxxxxxxxxxxxxx> wrote in message
> news:1113520661.860909.234240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> Well, the cheapest way is to use a 5 gallon bucket and time how long it
>> takes to fill it!
>>
>> Martin Custer
>> www.AutomatedOutlet.com
>>
>
> So filling a 5 gallon bucket in say 1 minute translates to how much pressure

I think you could derive an equation starting from fluid flow equations
that predict flow (eg Darcy-Weisbach).

known flow:  5gpm
need: what size pipe?
assume: general characteristics of similar pipe
derive: reasonable approxmation of pressure

some equations:
  http://www.efunda.com/formulae/fluids/pipe_friction.cfm
  http://www.lmnoeng.com/Pipes/PipeNetwork.htm
and all kinds of calculators, maybe one to do the job:
  http://www.martindalecenter.com/Calculators4_9_FluD.html

But it might be easier for to buy a pressure guage and measure static
and dynamic pressure and calculate the filter restriction.

sdb


--
Wanted:  Omnibook 800 & accessories, cheap, working or not
sdbuse1 on mailhost bigfoot.com