[Shop-talk] Natural Gas vs Propane Grills

[Jim Stone]

Thanks again guys.  We are going to have to replace the pipe soon anyway, as
we are putting a small addition on to the back of our house.  It will be a
while before we are ready for the new pipe, but I will do my best to remember
to report back as to how well the grill works without that last two feet.
Jim

> From: TR3driver at ca.rr.com
> To: shop-talk at autox.team.net
> Date: Sat, 2 Apr 2011 15:12:04 -0700
> Subject: Re: [Shop-talk] Natural Gas vs Propane Grills
>
> > Does the
> > last two feet
> > limit all that came before it?
>
> Don't forget, the area of the pipe is proportional to the square of the
> diameter.  So your 1/4 pipe has only 1/4 the cross-sectional area of the
> 1/2" pipe.  Think of putting your thumb over the end of a hose.
>
> Just for chuckles, I found an on-line calculator and put some numbers into
> it.  At 1 cfm (about 60,000 Btu/h), the drop through 2 ft of 1/4" pipe is
> more than the pressure at the regulator.
>
> IMO even the 16 feet of 1/2" is reducing the output at least a little bit,
> depending somewhat on how big the burner is.
>
> -- Randall
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