Otherwise, black plates are blasted and painted on arrival and before stowage. Some structurals (primarily bulb sections) also come pre-blasted to SA 2-1/2 and painted. Small areas, affected by hot work in the course of production, are cleaned mechanically and painted to restore to SA 2-1/2 status completion. Larger, accessible areas (like external hull and large internal holds/tanks/compartments) are re-blasted and painted in the final stages
Out of our three slipways, the largest one is reserved for on-slipway erection of over-dimensioned vessels; length more than 125m and up to 145m and/or beam more than 25m and up to 40m.
These building berths are not fixed but assigned depending on sizes and mix of vessels under production at any point of time. This flexibility helps us accept orders for simultaneous production of several vessels. At a peak period we have handled up to 10 vessels of varying dimensions.
Outfitting departments like piping, electrical, HVAC, accommodation, engineering are provided with independent power points for carrying out their work efficiently.
For launching, vessels (except for those erected on the largest slipway) are shifted from the building berth to the slipway on rails using a suitable configuration of pulleys and wire ropes activated by one or more winches located strategically to serve both slipways. Using a large number of hydraulic jacks, the vessel is positioned to the right inclination as pre-determined by launching calculation.
The final launching is done with the use of cradles running on steel rails.
Launching weight is not an issue. Shoft has launched vessels up to a lightweight of over 4500t.
To allow for higher aft drafts, the slipways have been extended on the riverside and, currently, aft launching drafts up to 3.5m can be easily handled. There is provision for further extension for higher aft draft.
The pontoons are connected to the shore with hinged, swiveling gangways to take care of tide variations and for easy round the clock access. The berthing pontoons stay afloat even in the lowest tide, which never goes below 7m. They are permanently provided with service connections - air, water, electricity and adequate safety arrangement, particularly for fire fighting.
Vessels, after launching, always remain in afloat condition. There is no interruption in afloat tests and trials.
Sea trials, depending on requirements, are often carried out in front of the shipyard itself where the river is very wide and depth is adequate. Otherwise trials are carried out in the Gulf of Khambatta where the river ends, about 10nm downstream from the shipyard.
The channel is wide and navigable and is sufficiently deep except for one or two points. Normal high tides allow drafts up to 4.25m. For higher drafts some special high tides need to be selected.