5.5.3 Slip-on Welded Sleeve Joints
Slip-on welded sleeve joints may be used for Classes I and II piping up to and including 80 mm (3 in.) nominal diameter except in toxic and corrosive fluid services (see 4-6-1/3.25 and 4-6-1/3.27) or services where fatigue, severe erosion or crevice corrosion is expected to occur, provided that:
• The inside diameter of the sleeve is not to exceed the outside diameter of the pipe by more than 2 mm (0.08 in.).
• The depth of insertion of the pipe into the sleeve is to be at least 9.5 mm (0.375 in.).
• The gap between the two pipes is to be at least 2 mm (0.08 in.).
• The fillet weld leg size is as per 4-6-2/5.5.2, see 4-6-2/Figure 1.