Figuring out the right boiler size

Alan(CaliforniaRadiant)Forbes

you add a piping and pick-up factor...........read this:

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S.L. Blackstone

sizing a new steam system

We have a steam system and the radiators are 2-pipe, both pipes coming in from the floor (that means it's 2 pipe air vent???) All the contractors who've come out have asked for height of radiators, diameter of tubes, # of tubes. Do they want this for radiant ability or for cubic feet of steam capacity? What questions do I ask to make sure they're spec'ing the right system for my current setup? I calc'd 13000 cubic inches of steam capacity, not including the "modern type" radiators. That sounds wrong to me though.

Help!

If anyone's curious, here's the radiator measurements. Except for the library, kitchen and laundry room, all radiators have 1 1/4" tubes.

Radiators
sections - rows deep - height

Living room 20 sections 3 rows deep 27" high

hall 20 sections 3 rows deep 27" high

dining room 20 sections 2 rows deep 27" high

library 40 sections 1 row deep 13" high;
tubes are diamond shape, 3x1 inches cast in pairs

kitchen 24 sections 4 rows deep 16" high;
more modern type

laundry 4 sections 6 rows deep 29" high;
more modern type

bedroom 1: 12 sections 3 rows deep 27" high

bedroom 2: 12 sections 2 rows deep 27" high

bathroom 8 sections 2 rows deep 27" high