Slip on flange welding according TO asme b31.3

1. 1. Slip on Flange welding acc. to asme b31.3-2016 Amr Soliman met_3mr84@yahoo.com 1 INSPECTIONACADEMY
2. 2. REF. : Fig. 328.5.2A Fillet Weld Size 2 Slip on flange welding is an equal FILLET WELD type , as seen in the Fig. The related fillet weld size is measured by the LEG Length using the welding gauge . Amr Soliman
3. 3. REF. : Fig. 328.5.2B Typical Details for Double-Welded Slip-On and Socket Welding Flange Attachment Welds Amr Soliman 3 Via The below figure, we can calculate the LEG length from both sides ( flange face side and flange hub size )
4. 4. Amr Soliman 4 Now, we have two different equations, The Left side ( Flg. Face side ) : fillet weld size = The lesser of T or 6 mm. The Right side ( Hub end side ) : fillet weld size = Xmin = the lesser of 1.4 T or the thickness of the hub . HINT : T= pipe wall thickness ( Ref. : ASME B36.10 for CS, or, ASME B36.19 for SS ) : Hub Thickness ( Ref : ASME B 16.5 for Flange size <= NPS 24 , ASME B16.47 for Flange size > NPS 24 )
5. 5. Ref. : ASME B16.5 5 The hub thickness = (X-B) / 2 Amr Soliman
6. 6. Practical Example Amr Soliman 6 • Suppose that the St. st Flange size is NPS 6, Sch 40s, Class 150 _____________ • Question: • What will be the fillet weld size at both sides ?
7. 7. Practical Example 7 • Ans: Based on the dimension tables of ASME B36.19, the wall thickness ( T ) will be 7.11 mm _________________________ • Flg. Face side fillet weld size = The lesser of T or 6 mm. • So, the answer is 6 mm Amr Soliman
8. 8. Ref. : ASME B16.5 Amr Soliman 8
9. 9. Practical Example Amr Soliman 9 • Using the previous table • The hub thickness= ( 192-170.7)/2 = 10.65 mm _________________________________ Hub end side fillet weld Size= X min = the lesser of 1.4 T or the thickness of the hub . Xmin= The min. of 1.4x7.11 ( = 9.95 mm ) or 10.65 Hub end side fillet weld size = 9.95 mm
10. 10. INSPECTION ACADEMY Amr Soliman 10