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ASME Section I¿¡ PG-61.1¸¦ º¸¸é Except as provided for in PG-61.2 and
PG-61.4, boilers having more than 500 ft2 (47 m2) of water‐heating surface shall have at least two means of feeding water. Except as provided for in PG-61.3, PG-61.4, and PG-61.5, each source of feeding shall be capable
of supplying water to the boiler at a pressure of 3% higher than the highest setting of any pressure relief valve
on the boiler proper.
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