Cochin Shipyard Ltd India is one of the top integrated marine building, repair and training services companies and India’s most respected commercial & defence ship and offshore structure building facility. www.cochinshipyard.com
The IRClass (Indian Register of Shipping), a leading Classification society and member of IACS, has just completed the new construction survey of the MV Indira Point which was completed two months ahead of schedule at a cost of approximately USD 25 million.
This vessel is a high value, technologically sophisticated Buoy Tender multi-purpose vessel built by Cochin Shipyard Ltd (India) under single class. The new vessel MV Indira Point, 72 mts long, 1350 tons DWT, fitted with Heli-deck and a 35 tons capacity crane for handling buoys in deep seas was handed over to the Directorate General of Light Houses and Light Ships (DGLL India) in April 2015. IRClass Chairman and Managing Director (CMD) Mr Arun Sharma said “This single class project and its successful completion represents a major step forward for IRClass”.
To evaluate the operating performance of an existing pumped sea water fire fighting system serving a heli-deck, determine the plant limitations based on a revised system layout, identify any changes required and potential plant optimisation opportunities.
As per the contract specification for the vessel, a helicopter deck with D-Value of 16 meters was to be arranged above the forecastle deck and helideck to meet the requirements of DNV (Class). DNV Rules for classification of ships Pt.6 Ch.1 Sec.2 E301 states, a fixed foam application system consisting of either monitors or pop up nozzles with minimum capacity of at least 6 l/m2/min shall has to be provided. The system must be able to cover the whole of the helicopter landing area and have sufficient foam medium to enable the foam application rate to be maintained for at least 5 minutes.
A fixed foam application system consisting of pop-up nozzles and foam skid connects with a sea water supply assembly installed onboard the vessel as per the above CLASS requirements. As per the foam system design, there was a minimum flow requirement of 90 m3/hr of sea water and the pressure required at the foam skid was 8 bar.
The vessel had an existing ballast pump that was capable of 150 m3/hr at 9 bar. The team at Cochin Shipyard Ltd checked the suitability of the existing pump for this upgraded application using FluidFlow. The reworked pipes and fittings were modeled together with pump performance data which was provided by the pump manufacturer. Figure 1 above provides an illustration of the overall system.
Figure 1: Fire Fighting System (Final Design)
Arun Kumar
V-Machinery Design
Engineers were able to establish that the existing pump could be successfully re-used, thus avoiding the need for an additional pump which was not anticipated during the project signing stage. This helped the team avoid further rework to the existing plant which is installed in a constrained area saving more time and revenue.
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