Post by ferryfast admin on Dec 6, 2011 13:29:47 GMT -5
Incat Insider Newsletter Issue 007
khannah@incat.coma.au
Incat
www.incat.com.au/
Is it time the HSC (High Speed Code) was relooked at, in relation to building bigger vessels running at lower, more fuel efficient speeds?
The code was developed from the Dynamically Supported Craft code and other novel ship codes. These rules attempted to allow ships of novel forms, that could not be built to SOLAS (Safety Of Life At Sea), but that had an equivalent level of safety.
SOLAS ships by their very nature are steel or other materials that are considered equivalent to steel. Aluminium and other non steel vessels must be built to the HSC code. An aluminium ship that has a constructed weight of around half of steel cannot be classed as a SOLAS ship.
For small fast ships the code has served well. However there is a minimum ‘speed over displacement’ equation in the rule that requires ever more installed power as the ships increase in size. A 150 meter ship of 4500 DWT requires far too much installed power to be practical. Such a ship however could be very economically attractive, and still faster than a conventional ship.
Incat’s current vessels up to 130 m meet HSC speeds but could run at slower speeds with less power but then would not meet the HSC speeds. It is when we get to vessels around 150m with 4500 tonnes DWT that no amount of power will enable us to meet the HSC speed as the requirement is related to displacement, hence more displacement, higher required speed and higher power.
It is clear that lighter ships do require less power than heavy ships. Less power equals fewer emissions and less pollution, etc. Our customers respect the need for ships requiring less power and are asking that we make this possible.
_________________________
Try Our >
PORT DYNAMICS
PORT DYNAMICS-2
khannah@incat.coma.au
Incat
www.incat.com.au/
Is it time the HSC (High Speed Code) was relooked at, in relation to building bigger vessels running at lower, more fuel efficient speeds?
The code was developed from the Dynamically Supported Craft code and other novel ship codes. These rules attempted to allow ships of novel forms, that could not be built to SOLAS (Safety Of Life At Sea), but that had an equivalent level of safety.
SOLAS ships by their very nature are steel or other materials that are considered equivalent to steel. Aluminium and other non steel vessels must be built to the HSC code. An aluminium ship that has a constructed weight of around half of steel cannot be classed as a SOLAS ship.
For small fast ships the code has served well. However there is a minimum ‘speed over displacement’ equation in the rule that requires ever more installed power as the ships increase in size. A 150 meter ship of 4500 DWT requires far too much installed power to be practical. Such a ship however could be very economically attractive, and still faster than a conventional ship.
Incat’s current vessels up to 130 m meet HSC speeds but could run at slower speeds with less power but then would not meet the HSC speeds. It is when we get to vessels around 150m with 4500 tonnes DWT that no amount of power will enable us to meet the HSC speed as the requirement is related to displacement, hence more displacement, higher required speed and higher power.
It is clear that lighter ships do require less power than heavy ships. Less power equals fewer emissions and less pollution, etc. Our customers respect the need for ships requiring less power and are asking that we make this possible.
_________________________
Try Our >
PORT DYNAMICS
PORT DYNAMICS-2