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Tuesday, January 7, 2020 

Hydrex says it has received ABS approval to carry out classification certified grade A wet welding.

To guarantee the required high standard of these underwater welds, NDT tests were performed by ABS surveyors. The certificate applies to underwater grade A groove welding. According to Hydrex, most wet welding certifications only permit fillet welds, often only to grade B or C. The Grade A certificate allows Hydrex to permanently repair cavitation or corrosion damage on rudders, clad welding, rope guard repairs, and Mewis duct repairs.

A class B weld requires inspection of the repair every three months. With class A welding the deadline for an inspection is much longer, and is decided by the attending surveyor on a case by case basis. Any required inspection will be for the underlying problem causing the damage and not for the welding work. An internal structural problem causing damage will not always be handled after the repair and will need to be followed up. For instance, doubler repairs can never be permanent because the doubler is installed over the damaged plating instead of replacing it (as is the case with insert repairs).

With class A underwater welding only a note is made stating that the affected area needs to be looked at during the next scheduled inspection. This is very important for tankers as a clean class certificate is requested by most charterers.

Hydrex adds that even for non-class items like rope guards the certificate is useful because it indicates the quality of underwater welding work.

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