When replacing tubes in a water-tube auxiliary boiler, to eliminate the possibility of leaks at the tube seats, the replacement tubes should be __________.
• Tube-to-tube-sheet joint methods used on water-tube auxiliary boilers • The purpose of rolling, beading, and seal welding tube ends • How boiler designers minimize leaks at tube seats in high-pressure service
• Which option gives a positive mechanical seal plus a backup weld at the tube seat, rather than relying only on heat treatment or backing rings? • Think about modern boiler repair practice: what is commonly done to ensure both tightness and strength where the tube enters the drum or header? • Which choice directly addresses the joint area between tube and seat, instead of just changing the metal properties of the tube?.
• Identify which method provides both an expanded (rolled) fit and a welded seal at the tube/drum interface • Verify which options only change material properties (like stress relieving or annealing) without adding a primary sealing feature • Confirm which method is commonly recommended in boiler repair guides and USCG study materials for minimizing tube-end leakage.
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