INTERNATIONAL STUDENT SMALL CRAFT/YACHT DESIGN COMPETITION

TYPICAL DESIGN REQUIREMENTS

ESCORT TUG/EMERGENCY RESPONSE VESSEL

INTRODUCTION

An Alaskan towing company has issued an invitation to bid on the design and construction for an Escort Tug/Emergency Response Vessel (ET/ERV) for operation in the Prince William Sound in Alaska. The primary mission of the tug is the escort of tankers in the Prince William Sound. In addition the tug will be equipped with emergency fire-fighting and oil spill response capability.

The owner is looking for a competitive price for the ET/ERV so it is important to incorporate Design for Production.

DESIGN REQUIREMENTS

To successfully perform its mission the following requirements must be met:

Superior maneuvering in restricted waters despite the relatively large size required for escort duties.
Capable of applying thrust in any direction with high precision.
Capable of operating in any direction (Towing when attached to the forward end of tanker, pushing on the stern and on side).
Adequate reserve stability to prevent deck edge immersion during normal operations.
Provision of additional fresh water for cleaning ET/ERV and crew in an emergency fire/oil spill situation.

The ET/ERV shall be classed by ABS as +A1 Towing Service, +AMS, +A1 Fire Fighting Class 1.

The ET/ERV shall meet all applicable USCG Regulations and in addition be certified as an OSRV under OPA90.

Accommodation shall be provided for a crew of 8, with 2 additional berths for crew required for ocean service, in 2 officer single berth cabins with private toilets and 2 crew single berth cabins with shared toilet and 4 crew double berth cabins with 2 shared toilets. As the crew will be onboard for up to three weeks, the accommodation should be integrated into a pleasant layout using space efficiently and for easy service by the crew performing their duties.

An ALL ROUND VIEW pilot house shall be provided.

PROPULSION

Propulsion shall be by either twin Z-Drive or Voith Schneider Cycloidal Propellers. Each propulsor shall be driven by a diesel engine. The propellers and propulsion diesel engines shall be sized to provide a bollard pull of 75 tonnes. Each propulsion engine shall drive a fire pump of the front end.

The diesel propulsion engines and the propulsors shall be controlled from the pilot house.

Electrical power shall be provided by 2 generators each sized to meet all anticipated loads.

DECK EQUIPMENT

A safety towing hook with design load same as bollard pull, capable of freely pivoting in the horizontal and vertical planes, should be installed. The hook should be able to be tripped from the pilot house. A crosshead bollard should be installed directly over the center of location of the skeg, made from 400 mm diameter heavy schedule pipe. A towing winch with a bare drum line pull not less than bollard pull shall be installed.

OTHER EQUIPMENT

Two 10 tonne capacity cranes shall be installed for use with the oil spill recovery equipment. Two winches shall be located to support the oil spill recovery equipment booms. A Man-over-board/OSR Boom Boat shall be provided. A pump room shall be provided with two pumps to handle the recovered oil and a tank for 10 000 liters shall be provided for the stowage of recovered oil.

Two fire-fighting monitors shall be installed for combined water and foam operation. The foam tank shall be located in the Machinery Space and have a capacity of at least 10 000 liters.

2 water makers shall be provided but fresh water tankage shall be enough for 7 days crew usage.

The ET/ERV does not require air conditioning..

Electronic suite shall include high class entertainment system, security system, 2 VHF radios, 1 cellular system, digital PBX, DPM system, 2 radars, chart plotter, depth sounder, and an integrated machinery control system.

A type II MSD sanitation system shall be provided.