The 1964 edition (with 1968 addenda) is still widely cited, though PTC 4-2013 supersedes it for new units. Many existing contracts and legacy systems still reference PTC 4.1, so understanding the original methodology remains essential.
Run the test for a minimum of 4 hours (for coal) or 2 hours (for oil/gas). Record at 15-minute intervals: Asme Ptc 4.1.pdf
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