Iowa Code r. 875-92.11 - Blowoff connection requirements
This rule applies to power boilers installed prior to July 1, 1983. Each boiler will have a blowoff pipe fitted with valve or cock, in direct connection with the lowest water space practicable.
(1) When the maximum allowable working
pressure exceeds 125 psig, the blowoff pipe will be at least schedule 80 from
the boiler to the valve or valves and will run full size without reducers or
bushings. Galvanized materials will not be used.
(2) All fittings between the boiler and valve
will be steel or at least schedule 80 fittings of bronze, brass, malleable
iron, or cast iron, all of which will be suitable for the pressure and
temperature. In case of replacement of pipe or fittings in the blowoff lines,
as specified in this paragraph, they will be installed in accordance with the
rules of new installations.
(3)
When the maximum allowable working pressure exceeds 125 psig, each bottom
blowoff pipe will be fitted with at least a 250-pound standard valve or cock.
Two valves, or a valve and a cock, should be used on each blowoff.
(4) When exposed to direct furnace heat, a
bottom blowoff pipe will be protected by firebrick or other heat resisting
material so arranged that the pipe may be inspected.
(5) An opening in the boiler setting for a
blowoff pipe will be arranged to provide for free expansion and
contraction.
Notes
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No prior version found.