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Having not really studied the vapor/flow collapse theories I see posted every now and then, I just got a surprise. I read those theories as the Product Condenser providing a vacuum effect as the vapor became liquid. So, I believed, a small diameter PC wouldn't effect the vapor or product flow.
My usual condenser is a triple wall Liebig, or as I now think of it, it is a Liebig with a Dimroth up the center.
From the standpoint of vapor flow, I have a 3" VM with a 3" takeoff, and (with the above PC) it narrows into a 1/2" vapor path in the Product Condenser.
For an early Xmas present, I bought myself an SD 2" x 20" seven tube shotgun. Pure vanity, I thought...they are pretty! Although I had hoped for a reduced water flow.
Well, I got the reduced water flow as I expected, +10%...and product comes off about five degrees F cooler.
What I didn't expect was a faster takeoff...I can only assume that the Shotguns seven ~3/8ths tubes took some pressure out of the system vs the old PC's one 1/2" vapor path.
Very nice surprise...
I think the PC is the most overlooked part of most of our rigs.
I will always preach that you need to oversize or properly size your Product Condenser while designing your setup!
DAD... not yours.. ah, hell... I don't know...