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Offsets in pipes between floors?

ChrisJChrisJ Posts: 2,819Member ✭✭✭
I've lived here since 2011 and just realized most of my pipes either have, or are suppose to have an offset in them near the ceiling.  Apparently 2 currently do, one of which is hidden in a cabinet and the other is hidden in a wall.  The third I'm putting back this weekend as it was piped through the closet via copper as mentioned in another thread.

Besides those 3, two other radiators on the second floor which are much larger have a 90 deg elbow coming off of the valve.  I had wondered why those two had that setup and the others didn't and now I know, because their offset is on the first floor.  Ive attached a few photos, one is a drawing of the pipe I'm putting back in, the other is of the offset in a cabinet and the last is of one of 90s on one of the two large radiators  Makes me wonder why the large radiators are piped differently than the smaller ones.  I'd assume the two 45's is superior.



The one I am installing is along side a door, but the door is a recent addition so that isn't the reason for the offset.  These were obviously done to keep the pipe close to the wall but I don't recall seeing this in other houses?  Is this common and I've just been oblivious to it? 



EDIT : The two larger ones have a single 45 coming off of the valve, NOT a 90.  My mistake.
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Weil-McLain EG-40 connected to 392sqft of radiation via two 2" risers into a 3" drop header and 2" equalizer. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment Typical operating pressure 0.5 - 1.0 inch wc.

Steam system pictures updated 1/25/15.
https://picasaweb.google.com/thetube0a3/Boiler?authkey=Gv1sRgCImUxIqv9436MQ#

Don't push the envelope, eliminate it.
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