Welder qualification as per 1104

Plz explain the welder thickness and diameter range as per API-1104 with example

Para. 6.2.2 d) and e) given very details.

d) A change from one specified OD group to another. These groups are defined as follows:

  1. specified OD less than 2.375 in. (60.3 mm),
  2. specified OD from 2.375 in. (60.3 mm) through 12.750 in. (323.9 mm),
  3. specified OD greater than 12.750 in. (323.9 mm).

e) A change from one specified wall thickness group to another. These groups are defined as follows:

  1. specified pipe wall thickness less than 0.188 in. (4.8 mm),
  2. specified pipe wall thickness from 0.188 in. (4.8 mm) through 0.750 in. (19.1 mm),
  3. specified pipe wall thickness greater than 0.750 in. (19.1 mm).
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