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Posted by Heatpro on May 18, 2006 at 13:53:33:
In Reply to: Re: Gas Steam Boiler posted by joe on May 18, 2006 at 11:38:11:
Use the sizing chart 7 for branches at
As measurements for that chart should start at the circulator around the entire circuit through the radiation and back to the boiler and circulator again as a 1/2-inch or 3/4-inch circuit, but here the main will be larger, each run will have less resistance, so the chart is a very generous - which can solve potential clog or valve resistance problems. Each half-inch line at a 40F drop through the radiator will allow 30,000 btuh (1.6 gpm @ 9 ft heat) through the radiator at a complete circuit length of 180 feet with a 9-foot head which popular circulators provide. As you will balance the flow at the radiation branches with balancing valves, the generous allowances for water flow will not be a concern when you adjust them down to what is needed for the room.
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