REPAIR SPECIFICATIONS FOR DRYDOCKING

• The overboard (sea water) valve is to be overhauled/ repaired. The specification should state:
• The valve is to be dismantled, the valve and seat inspected for corrosion, pitting, wastage and damage.
• The valve seat and disc are to be re-faced/ re-ground or renewed as required to give a tight shut-off.
• The valve spindle/ gland packing is to be renewed; the gland is to be repacked.
• The valve body is to be inspected for corrosion/ wastage (ultrasonic thickness check) and repaired/ renewed if below the safe thickness.
• The valve is to be pressure-tested (to the working pressure) after repair to confirm a tight shut-off.
• The valve is to be re-fitted with new gaskets/ bolts and the flange joint made good.
• The valve is to be surveyed/ approved by the Class surveyor as required.

• The hydraulic oil pressure line is to be repaired. The specification should state:
• The holed section of the hydraulic line at the deck penetration is to be cut out and renewed with new pipe of the same material/ size/ rating.
• The new pipe is to be welded/ flanged to the existing line with proper joints.
• The deck penetration/ gland is to be inspected and made good (renew the gland/ seal) to prevent water ingress and to support the pipe.
• The hydraulic line is to be pressure-tested (to the system working pressure) after repair to confirm no leaks.
• The hydraulic system is to be bled/ purged and the winch tested for correct operation.
• The repair is to be carried out to the maker's/ Class requirements.

• The deck seal (the water seal/ P.V. breaker of the inert gas system) is to be repaired. The specification should state:
• The deck seal is to be inspected for corrosion, wastage, cracking and damage.
• The seal is to be cleaned and the water seal/ P.V. breaker internals inspected.
• Worn/ damaged parts (the seal plates, the water level control, the non-return/ flame screen) are to be renewed.
• The seal is to be pressure-tested/ leak-tested to confirm it maintains the inert gas seal.
• The deck seal is to be re-commissioned and the inert gas system tested for correct operation (maintaining the inert gas pressure/ seal).
• The repair is to be carried out to the maker's/ Class requirements and surveyed as required.