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ASME B31.3-2016 <br /> Fig. 328.3.2 Typical Backing Rings and Consumable Inserts <br /> 5mm <br /> r (3/16 in.) <br /> tm <br /> (c) Nonmetallic Removable <br /> Backing Ring(Refractory) <br /> 419 mm <br /> 3 mm to 5 mm (3/4 in.) <br /> (1/8 in.to 3/16 in.) <br /> (a) Butt Joint With Bored Pipe Ends <br /> and Solid or Split Backing Ring [Note(1)] Ea 0 <br /> (d)Square Ring or Round <br /> 5 mm Wire Type <br /> Aw (e) Flat Rectangular Ring <br /> Typical <br /> Consumable <br /> Inserts p� (f) Formed Ring Type <br /> dy//rli� <br /> 3 mm to 5mm 19 mm <br /> (3/4 in.)� <br /> (1/8 in.to 3/16 in.) <br /> (b) Butt Joint With Taper-Bored Ends (g)Y-Type <br /> and Solid Backing Ring [Note(1)] <br /> N OTE: <br /> (1) Refer to ASME 1316.25 for detailed dimensional information on welding ends. <br /> Fig. 328.4.2 Typical Butt Weld End Preparation <br /> 371/2 deg ±21/2 deg i 20 deg ±21/2 deg Fig. 328.4.3 Trimming and Permitted Misalignment <br /> 22 mm 5 mm <br /> (7/8 in.) (3/16 in.l <br /> ?t <br /> �tm <br /> -�1.5mm±0.8mm <br /> (1/16 in.± 1/32 In.) <br /> Permitted <br /> (a)Wall Thickness 6 mm to 22 mm, misalignment. \ <br /> /16 in.to 7/6 in.) <br /> 30 deg max. <br /> Inclusive(3 See WPS. <br /> (a)Thicker Pipe Taper-Bored to Align <br /> 20 deg ±21/2 deg <br /> 10 deg ±21/2 deg 7 <br /> RA, 71/2 deg <br /> 21/2deg > <br /> >22mm gin.) 5mm19 mm (3/16 in.► <br /> {3/4 in.) 7 <br /> � L Permitted Round, <br /> 1.5 mm±0.8 mm misalignment. corner 7 30 deg <br /> (1/16 in.± 1/32 in.) See WPS. max. <br /> (b)Wall Thickness Over 22 mm(7/8 in.) (b) Thicker Pipe Bored for Alignment <br />