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Pickup factor. Help me understand
I'm a bit confused by the use of a 33% pickup factor.
The way I see it, with your piping insulated as it should be the piping should dissipate a fairly small amount of heat. Now in my system my pickup factor is something like 31,000 btus. Once the piping is hot I could see it dissipating maybe 5000btus through the insulation, but 31,000?
So my question is, why do we need a 33% pickup factor if all of your piping is insulated? Wouldn't something like 5% do just fine?
Is the 33% there to makeup for missing insulation and poor venting? Is it simply a fudge factor and not actually necessary if everything is perfect?
Single pipe quasi-vapor system.
Typical operating pressure 0.15 - 0.43 oz measured with Magnehelic. High pressure limit set to 4.6oz. Weil-McLain EG-40 with barometric damper connected to 392sqft of radiation via two 2" risers into a 3" drop header and 2" equalizer. ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
Steam system pictures updated 1/25/15.https://picasaweb.google.com/thetube0a3/Boiler?authkey=Gv1sRgCImUxIqv9436MQ#