Steam boiler sizing

antman

Hello all,
I was at Dan's "Dead Men Steam" night school this evening and it was extremely enjoyable to say the least, most importantly I feel I gained more knowledge and had a good time to boot. Thanks, Dan.

One of the subjects talked about was to take into account the pick up factor used by manufacturers of replacement boilers may not be adequate, when radiation has been removed. I have a situation, commercial building about 7000 sq. ft. single story that holds 4 different stores. Many radiators have been removed over the years. The connected load came out to be only about 697 sq. ft. EDR. there are (2) 3" partially insulated mains traveling from 1 end of the building to the other with a distance about 100'+/- each, with a gravity return. The boiler I was going to use is a Weil McLain 308 which is 867 sq. ft. steam, the boiler that was already removed from the mechanical room before I was to look at the job, was an old Weil(model?) 9 section, I am extremely concerned I am going to be undersized. I prefer to get this right before I install this baby even if I goofed on estimate.
Any help would be greatly appreciated.

Thanks, Anthony

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bob young

the load = sq. ft. rad.

the connected load on steam is the bottom line. check if every one is comfortable with heat output when system is operating correctly. if not maybe some discarded radiation should be replaced or at least figured into final load. pretty cut and dry on steam