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    5.9.3 Steam Boiler Return Pipe Connections5.9.3.1 The return pipe connections of each boilersupplying a gravity-return steam-heating system shallbe so arranged as to form a loop similar to that shownin Figures 5.9.1-3 and 5.9.1-5 so that the water in eachboiler cannot be forced out below the safe water level.5.9.3.2 For handfired boilers with a normal...

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    101.1.3 Maintaining Proper Water Level. Boiler water level control and furnace pressure control, where required,are subsystems of combustion control. Every effort should be made to place these on automatic operation as soon aspossible during start-up because otherwise, they require constant operator attention.CAUTION: Operating without sufficient water to...

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    ð23SUBSECTION BREQUIREMENTS PERTAINING TO METHODSOF FABRICATION OF PRESSURE VESSELSPART UWREQUIREMENTS FOR PRESSURE VESSELS FABRICATED BYWELDINGGENERALUW-1 SCOPEThe rules in Part UW are applicable to pressure vesselsand vessel parts that are fabricated by welding and shallbe used in conjunction with the general requirements inSubsection A, and with the...

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