Advantages
¨ç Enhanced fatigue resistance as inside radius eliminates
stress concentration at the sleeve to shell corner
¨è Greater resistance to failure from thermal cycling
¨é
Liner cylinder
circumferential weld seam in sleeve is
eliminated
¨ê Sleeve can be made tight against steel nozzle forging,
reducing failures due to pressure cycling
¨ë Final weld in sleeve is made from the outside at the lap joint
collar ring, not inside the sleeve
Advantages
¨ç Distortion of the tubesheet is minimized by the relief groove
¨è Full inert gas shielding is achieved
¨é This configuration can tolerate some tube out-of-roundness
¨ê Easy repeatability and uniformity of welds
Advantages
¨ç
Large
capacity heat treating
furnace not
required
¨è Easy temperature control
¨é Possible to check
for leakage
during test
¨ê Savings in cost and delivery
time vs.
¡°in furnace¡± test
