Low hydrogen electrodes in accordance with paragraph 8.1.6 shall be used for welding pressure retaining welds and attachment welds to pressure retaining components for the following:
• Non-impact tested carbon steels and duplex steels when the nominal thickness at the weld is in excess of 0.5 in (13mm)
• 300 series stainless steels when the nominal thickness at the weld is in excess of 1.0 in (25mm)
• Impact tested carbon steels, Ni-alloy steels and low alloy steels for all nominal thicknesses.