Cracked weld :
Severe indentation in way of frame :
Surfaces suffering from general Corrosion :
- Inform Class surveyor & seek his opinion.
- Trace the length ok crack by DPT.
- One inch from both sides drill crack arresting holes.
- Gas free the tank from inside
- Guaging of Crack to be carried out by guaging electrode till bottom of the crack is reached
- Welding electrode, welder & procedure to be class approved. Low Hydrogen Electrodes are used.
- The affected portion to be heated to 200 deg C by flame torch & temp to be noted by IR sensor.
- Carry out welding from either side
- The weld is again to be heated by flame to rleive stress & covered with insulation tapes to reduce cooling rate.
- Weld to be inspected & arrest holes to be welded
- Radiography to be carried out.
- Hose test to be carried out.
- Primer & paint to be applied
Severe indentation in way of frame :
- It cannot be tolerated so has to be cropped off alongwith bend frame & renewed.
- Put 2 small size plates & weld it to frame (tag) with actual size plate.
- Heating & stress rereleiving to be carried out.
- Radiograpgy & Hose test of the weld to be carried out.
Surfaces suffering from general Corrosion :
- Guaging to be carried out & if 20 % is eaten away plate needs to be renewed.(decided by class survyr)
- Only thing to be done is clean the surface, coat with primer, anti fouling & anti corrosive paints.
- Add Zinc Anodes.
Bilge Keel Fractured :
- Crop the damaged part & renew.
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