Pipe Flow Calculations Forum

• q = flow (m3/h) • d = diameter of pipe (mm) • h = pressure drop (mbar) • l = length of pipe (m) • s = specific gravity of gas (density of gas / density of air) h = ( q^2 * s * l ) / ( 0.0071^2 * d^5 ) q = 6 m3/h d = 20mm l = 19M s = 0.58 The result is 2.459 i.e. the pressure drops by 2.2459 mb, wh...

Hi, Thank you for your patience I do appreciate it, I do hope my ignorance is not becoming an irritant. My requirmenets are possibly less exacting and I wonder what your views were on Poles formula which I found on the web site of the University of Hong Kong (see link here below (page 10)). I would ...

Hi Thanks once again . . You state: P - is the Power of boiler and p is pressure. And the below formula includes P and not p Q = 3600 * P / Hd = 3600 * 24 / 33600 = 2.57 m3/h Please forgive my ignorance but can you confirm that the above formula is not using / does not need the pressure 'p' (1034) a...

Sorry about this but . . . . . Flow Rate . . .

In calculating the flow rate surely the starting point is what volume of pressure is supplied rather than what volume of pressure is required by the appliance?

Thank you Admin for a very helpful post I do much appreciate your help on this. Just to make my own position clear; I am a retired Maths teacher in the UK looking at changing my central heating gas boiler from a 30kw to a 38kw boiler and getting quotes from plumbers telling me that my 22mm gas pipe ...

Please - pretty please!

Come on guys, you can do it!

I can access, on this site, what looks to be an excellent tool to calculate the drop in pressure of natural gas over a length of pipe ( if only I knew how to use it! ) I have natural gas entering a domestic dwelling meter at 21mb, it goes down a 22mm (external diameter) copper pipe for 16 meters to ...