boiler sizing

LARRY_32

Brad, Thx for info. The center to center spacing is 1 3/4 inches. I'll consider your calculation of 303SF as the minimum that steam boiler must be able to produce.
Looking at Burnham V83 which is rated at 283SF while V84 rated at 396SF. Will probaby go with V83 as afraid the V84 is too big and might cause other problems.

LARRY_32

BOILER SIZING

Can someone help in determining size of new oil replacement steam boiler based upon size of radiators. House has a single 2 inch main steam line.
There are 7 radiators manufactured in late 1940's by "SD".
They are 4 1/2 inches wide, 1st and last sections are 25inches high(inside sections are 23inches high). Each section has 4 columns approx. 7/8 inch wide. Number of sections for each radiator are: 8, 14, 14, 16, 16, 18,28.
Thanks for help.

Brad White

Larry

What is the center-to-center section spacing? I am thinking 1-1/2" or 1-3/4" from the other information you provided. They are apparently the "small tube" type.

If this is the case, my tables say that each section would have 2.0 SF EDR. I see you having 114 sections, 228 EDR net radiation connected. With the normal I=B=R 1.33 factor for piping and pick-up, your boiler should have an output of 303 SF EDR.

But this is just a guess without any photos or other confirmation of your section spacing.

You are correct in that you are to size your steam boiler to the radiation.

Brad

Brad White

I agree Larry

and as part of that direction, insulate your piping scupulously to minimize the encroachment on your "1.33 factor".

Adding TRV vent valves can also replicate reduced connected radiation at least once the system is warmed up.