Removing 2nd Riser for Smaller Replacement Boiler

wcs5050 · January 1

Another failure above the water line on a double oversized, short cycling boiler. Had to be holiday week(s). Radiation EDR and pick up factor show almost 2.5x too big.. they did a nice job piping though.

Can anyone weigh in on best approach for removing a riser preference? Looking at pulling right side of tee and capping with close/space nipple. Thx

ChrisJ · January 1

What boiler are you looking at installing?

Big Ed_4 · January 1

Without going into the reason , you want to remove the right side header off the boiler ?

ChrisJ · January 2

https://forum.heatinghelp.com/discussion/comment/1880314#Comment_1880314

They want to install a new smaller boiler.

mattmia2 · January 2

can probably make the header more of a u or l shape depending on if the riser is in the left or right side of the boiler then connect directly up to the main or connect to the main with a tee in the header at a 45 and a 45 in the riser to the main to make an offset.

a drop header is also a possibility, i think it would just be 2 more fittings and 2 nipples and would give you more room to make an offset to the main. that horizontal connection to the main is ok but it would be much better if it weren't there.

if the outlet is on the right side of the boiler you 90 back then 90 to the equalizer and put the tee for the main in that section(or 3 90's and 2 nipples from the riser to make a drop header)

if the outlet is on the right side of the boiler you do a 90 to the right, then a 90 to the back then a 90 to the equalizer and pick up the main somewhere in there (or 3 90's and 2 nipples at the boiler riser to make it a drop header)

wcs5050 · January 2

PEG35. Left side top connection.
Existing edr only 135 x 1.5 pickup puts it at 202sqft. New boiler is still a bit large to cover reconnect of removed rads.

ethicalpaul · January 2

a bit large?

Where do you get 1.5 pickup factor?

But forget the pickup factor, it is already included in the boiler rating. The EG30 delivers 196 sq ft (EDR) so even that one is oversized. The EG35 is way overboard.

But yes, a single 2” riser is fine

wcs5050 · January 5

1.5 pick up from The Lost Art of steam Heating… accommodates for in insulated piping and future connect on this system. A bit large yes. Feeding an indirect with 1” coil as well.. indirect serves forced hot water heat zones.

ChrisJ · January 5

https://forum.heatinghelp.com/discussion/comment/1880905#Comment_1880905

1.33 is already too big and already includes 33% extra for uninsulated piping which it will never need.

50% over "just in case" is too much, don't do it. Especially on a tiny system like that.

The EG-30 is more boiler than you'll ever need even with the indirect.

KC_Jones · January 5

You need a PEG 30, the 35 is oversized for sure. Indirect or not.

PEG 35 has a gross output of 82,000 or 341 sq ft of steam

You are installing it on a system with 135 sq ft of EDR. That give an actual pickup factor of 150% That's enough pickup factor to support 336 feet of 2" uninsulated pipe, which I seriously doubt you have.

The boiler ratings already have a 30% pickup factor included so you do not ever do your own pickup factor on top of that or you will be grossly oversized as you are proposing.

The PEG 30 has a gross output of 62,000 or 258 sq ft

Installing it on that system would give a pickup factor of 91%, which is still grossly oversized, but it's as small as you can go so not much choice.

Please, I beg of you, do not even consider the PEG 35.

Removing 2nd Riser for Smaller Replacement Boiler

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