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[Shop-talk] Natural Gas vs Propane Grills

Subject: [Shop-talk] Natural Gas vs Propane Grills
From: TR3driver at ca.rr.com (Randall)
Date: Sat, 2 Apr 2011 15:12:04 -0700
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>
> 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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