Unit Fabrication

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In most instances the 2-dimensional sub-assemblies will be built into
3-dimensional block assemblies. The size of the block assembly will have been
decided at an early stage of the planning process ideally at the structural
design stage. Constraints such as lifting capacities and dimensions that can be
handed are taken into consideration also the provision of breaks at natural
features ensuring the block are self supporting and easily accessed etc. Panel
assemblies used in the block may well have dimensions restricted by the plate
length that can be handled at the machining stage and this can subsequently
influence block length. In the machinery area the block size and arrangements
can be decided by zone outfit considerations.

Each block should be designed for maximum downhand welding but may have to
be turned for this purpose. Also block are turned to effect outfit installation
particularly those containing machinery flats in the aft engine room areas
where pipework etc. can be fitted on the underside of the flat with the block
in the inverted position and then it is turned to install equipment above the
flat . A block’s centre of gravity is calculated and lifting lugs so provided
that these operations can be undertaken, and finally the block can be suspended
for erection at the building dock or berth and drop into place in the correct
plane.

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