Robert Allan Ltd. - Vancouver, BC, Canada
www.ral.bc.ca

Over the fall of 2002, I worked with Robert Allan Ltd. in Vancouver, British Columbia. Robert Allan Ltd. (RAL) is Canada's oldest privately owned consulting Naval Architectural firm and has experience in the design of almost all types of commercial vessels, however the firm is best known for its work in the fields of tug/barge transportation, fast patrol craft, ship-assist and escort tugs, fireboats and shallow-draft vessels. During my time with RAL, I worked on several boats all that were being built to various standards including those of the American Bureau of Shipping, Bureau Veritas, and Lloyds Register of Shipping.

One of the more major projects for which I was involved, was the conversion of a 25.5-meter tugboat from conventional twin-screw to an Azimuth Stern Drive (ASD). Our client for this project had sourced a half-built hull that had never been completed, and wished to modify the boat to accept modern ASDs. The design brief for the tug was “A 25m, 35 ton bollard pull vessel designed to be capable of a variety of tasks, including carrying cargo out to offshore rigs, in a safe and efficient manner”.

The project was broken into two phases, and under the guidance of a senior Naval Architect, I completed most of the work. The first phase of the project included: An initial review of all the drawings and data available, particularly the lines plan and structural drawings, a preliminary assessment of the tug’s stability, a preliminary shaft-line arrangement to establish geometry limits for engines and drives, and a brief report to the client on the overall feasibility of the conversion project. The second phase of the project included: An ASD foundation drawing, an aft end structural reinforcement drawing, a main engine seating drawing and shafting arrangement, an updated general arrangement, and updated machinery layout. Many aspects of the work were completed using existing codes and standards from the American Bureau of Shipping; Structural arrangements, engine room and mechanical layout, as well as shafting calculations and arrangements. All drawings were done in Autocad.