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8/21/2012 7:58:24 PM
Can I get help on IBC 2009 table 508.2.5? It seems that 2009 version is no longer requiring 1-hour rated enclosure for boilers above 400,000 BTUH, since it calls only for furnace room and per IMC definition a furnace room is everything used for space or hydronic heating except boilers. The next line in the table speaks about boilers not being over 15 psi and 10 hp wouldn't need an enclosure.
Converting boiler 10 hp into BTU/h I get 25,444.33 BTUH. Does that mean, that literaly every boiler must be installed in a 1 hour rated mechanical room? Or how should this code be interpreted or applied?
Thanks for help
8/22/2012 6:25:35 PM
Rooms with boilers where the largest piece of equipment is over 15 psi and 10 horsepower
The boiler has to meet both requirements before a 1-hour room or fire protection is required.
ICC does not stand for Intentionally Clear and Concise
8/23/2012 11:11:27 AM
I am sorry, but I didn't ask for this. I know that. My question was:
Is the requirement of 400,000 BTUH no longer applied to boilers since IMC 2009 seems to be excluding it?
And second, how do you convert 10 hp? If you use regular conversion you get 25 MBH, is that correct and if so, does that mean that every boiler has to have an enclosure? A typical residential boiler is usually 30 psi and its capacity ranges from 50 - 400 MBH. so it would exceed (or meet) both requirements for enclosure. So I am suspicious about my conversion.
8/24/2012 3:47:23 PM
For fire protection requirements yes the 400,000 BTU's is no longer the required number.
For a boiler room requiring 2 exits the 400,000 BTU's is still the number to use.
Although the IBC code does not clarify the 15 PSI requirement the definition of a low-prssure boiler does
BOILER. A closed heating appliance intended to supply hot water or steam for space heating, processing or power purposes. Low-pressure boilers operate at pressures less than or equal to 15 pounds per square inch (psi) (103 kPa) for steam and 160 psi (1103 kPa) for water. High-pressure boilers operate at pressures exceeding those pressures.
Is it a steam boiler or a boiler for heating water.
I long for the more simple times when we did not need to ask for all the variables.
The Boiler Horsepower (BHP) is
An BHP is equivalent to 33,475 BTU/Hr or 8430 Kcal/Hr and it should be noted that a boiler horsepower is 13.1547 times a normal horsepower.