Had a 12°C overnight swing on a 24-inch jacket brace at 18 m, wet SMAW on a 400 mm doubler, aiming for AWS D3.6M Class A… For those working to DNV-OS-C401/ABS, are you holding 24 hours before MT/UT to mitigate hydrogen cracking, and what surface prep has kept porosity down in silted water without compromising diver safety?