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[Shop-talk] Natural Gas vs Propane Grills

Subject: [Shop-talk] Natural Gas vs Propane Grills
From: jandkstone99 at msn.com (Jim Stone)
Date: Sat, 2 Apr 2011 18:27:56 -0500
References: <AANLkTineLbYkVvPoQmyDTnmpHx_oF9mTJdbgftc630bH@mail.gmail.com><989191743.439910.1301748528539.JavaMail.root@sz0129a.westchester.pa.mail.comcast.net><DD35EDD670C8487CA1FC718EB2F1BDDD@EntCent>, , <AANLkTim2o_GuRtFHq57i6-6BHef845jz5bNofrTd52jR@mail.gmail.com>, , <D8C88C2A6ED44521845CC68DC52501B2@EntCent>, <COL115-W57336A556BB0DB04D089D2CCA10@phx.gbl>, <188301cbf182$ff8ec420$0301a8c0@randall>
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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