Skip to main content

Hull repair

Cracked weld :
  • 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.    


  1. For construction industries welding is very essential. Welding needs to make buildings, gates, and also fences. There are different types of welding machines use in construction industries. However, if you want to buy the best welding machine, you can visit the Service Welding Supply website.

  2. I really thankful to you for this content and informative details. I really like your blog and content about Welding Machine Price topic. I truly appreciate your work and efforts. well done.

  3. Thanks for sharing the best information and suggestions, it is very nice and very useful to us. I appreciate the work that you have shared in this post. Keep sharing these types of articles here. Foot Creams for Cracked Heels online Singapore

  4. Brass may be joined together using MMA, MIG, and TIG welding techniques. No matter what kind of welding you are doing, you need to take caution while selecting your shielding gas. If you want to learn how to do brass welding, however, you should visit the Weld Gearz website.

  5. Laser cutting is a much more efficient process than mechanical tooling and cutting because it costs less and is much more accurate. 1000w rust removing laser

  6. Thanks for sharing this worth reading article. This is really helpful. Keep sharing. Aluminium Laser Welding Machine for sale in Hyderabad


Post a Comment

If you have any doubts.Please let me know

Popular posts from this blog

Differences between MC/MC-C and ME/ME-C engines

The electrohydraulic control mechanisms of the ME engine replace the following components of the conventional MC engine: Chain drive for camshaft Camshaft with fuel cams, exhaust cams and indicator cams Fuel pump actuating gear, including roller guides and reversing mechanism Conventional fuel pressure booster and VIT system Exhaust valve actuating gear and roller guides Engine driven starting air distributor Electronic governor with actuator Regulating shaft Engine side control console Mechanical cylinder lubricators. The Engine Control System of the ME engine comprises: Control units Hydraulic power supply unit Hydraulic cylinder units, including: Electronically controlled fuel injection, and Electronically controlled exhaust valve activation Electronically controlled starting air valves Electronically controlled auxiliary blowers Integrated electronic governor functions Tacho system Electronically controlled Alpha lubricators

Why is a man hole door elliptical in shape?

Any opening in a pressure vessel is kept to a minimum and for a man entry an elliptical hole  is lesser in size than the corresponding circular hole. More over it is prime concern to have a  smoothed generous radius at the corners to eliminate stress concentration. Hence other  geometrical shapes like rectangle and square are ruled out.  To compensate for the loss of material in the shell due to opening, a doubler ring has to be  provided around the opening. The thickness of the ring depends on the axis length along the  dirrection in which the stresses are maximum and the thickness of the shell. It is important to  align the minor axis along the length of the vessel, as the stress in this direction is  maximum. Longitudinal stress: Pd/2t where P= pressure inside the vessel, d= diameter of the arc, t=  thickness of the shell plating  Circumferential stress: Pd/4t  More over a considerable material and weight saving is achieved as minor is along the  direction of maximum stress.

Main engine interlocks

Interlocks are provided so that the engine can be started or reversed only when certain conditions have been fulfilled. When there is a remote control of engines, it is essential to have interlocks. This reduces the possibility of engine damage and any hazards to the operating personnel. Turning gear Interlock . This device prevents the engine from being started if the Turning gear is engaged. Running Direction Interlock . This prevents the fuel from being supplied if the running direction of the engine does not match the Telegraph. Starting Air Distributor in end position . This prevents starting from taking place if the shifting of the Distributor has not been completed. Main Lube. oil pressure, Piston cooling pressure, Jacket water pressure, and important parameters must be above the required minimum. Auxiliary Blower Interlock . The Auxiliary Blower is provided in case of Constant pressure turbo charging. Air Spring pressure Interlock . In case of the present generation