ASME B 31.3 - SOME IMPORTANT POINTS

Some important points from ASME B 31.3

1. Tack welding can be done only by a qualified welder.

Refer: ASME B 31.3 Clause: 328.5.1 (c)

2. How much can a branch pipe be inserted to the run pipe?

Refer: ASME B 31.3 Clause: 328.4.3 (c)(1)

3. How much should be the preheating area near a weld joint?

Refer: ASME B 31.3 Clause: 330.1.4

4. What are the conditions when PWHT is not required, if the general condition of the job requires PWHT?

Refer: ASME B 31.3 Clause: 331.1.3 (b)

5. What is the % of hardness test required after PWHT?

Refer: ASME B 31.3 Clause: 331.1.7

6. How much should be the PWHT area near a weld joint?

Refer: ASME B 31.3 Clause: 331.2.6

7. Preheat temperatures for different materials.

Refer: ASME B 31.3 Table 330.1.1

8. Requirements for heat treatment.

Refer: ASME B 31.3 Clause: 331.1.1

9. Minimum welding dimensions for socket welding components other than flanges.

Refer: ASME B 31.3 Fig 328.5.2C

10. Typical details for double welded slip on and socket welding flange attachment welds.

Refer: ASME B 31.3 Clause: 328.5.2B