3.2 General
3.2.1 Welding processes
a) Welded joints of pipes are to be made by means of electric
arc or oxyacetylene welding, or any other previously
approved process.
b) When the design pressure exceeds 0,7 MPa, oxyacetylene
welding is not permitted for pipes with an external
diameter greater than 100 mm or a thickness exceeding
6 mm.