The Atrium


This manifold was for shore connection, and allowed unloading and offloading of cargo. The main engine drove a centrifugal pump capable of moving approximately 238,000 litres of oil per hour.
  In order to allow easy access to the cargo bay, this 6" pipework will have to be removed, and a new bit of boat added.
With drip trays and end caps removed, the full size of the manifold becomes clear. I had planned to unbolt and remove a piece at a time, but my friendly neighbours from Huskisson welding turned up with their forklift and removed it in one go. Thanks guys.


Now the space is cleared, new construction can begin. This will form the cover over the staircase, as well as providing additional headroom over the mezzanine floor. 
 The plan was to create an angular addition with a large flat front, following the style of the store room and galley. After fitting the starboard side and standing back, I did not feel that this looked right.
After a little experimentation with some clamps and a straight edge, I settled on this modification.

 Both sides now in place, ribs fitted and fully welded, and starting to get the roof fitted whilst the weather is nice.

To form the radii, sections of the 6" cargo pipework have been used. The welds will be ground flush when finished to give the appearance of a rolled sheet. Since I am currently moored in a local beauty spot, excessive grinding seems anti-social.
 The rest of the roof goes on and gets stitched into place. It is slightly too short, as a consequence of making design changes after ordering material cut to size. Fortunately I have some 50mm flat bar that will fill the gap nicely.

Outer shell now completed. This is fully seam welded both sides to the storeroom bulkhead, yet just resting on top of the tank. This will help to minimise stresses from thermal distortion.
  Once the opening through the tank top is formed, the two can be securely clamped and welded.
 Time to start admitting a little light. I got a good deal on cast aluminium portholes from Trinity Marine. These match the style of those originally fitted, and come complete with new glass.
  This simple jig holds my plasma torch and cuts a nice neat circle.
 After drilling some holes and a little work with a flap disk, the casting can be mounted.



Pictures of the breakthrough to follow shortly...

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