Cable Design and Contingency Plan

Integrated Cable Ferry Project
Route 21 : Buckley Bay ~ Denman Island
Community Presentation
8th August 2013
Our Commitment
Our commitment remains the
Delivery of a safe, reliable
and efficient ferry service
 Wind conditions
 Cable Design and Contingency Plan
 Loading and Unloading Vessel
 Economics and Business Case
 Experimental technology
 Service Availability
 Baynes Sound Wind Conditions
BC Ferries has taken into account the actual wind speeds
of Baynes Sound
Thorough tank simulations and detailed analyses of the
cable ferry performance have been conducted
The Statement of Requirements contains this data as
design criteria
The cable ferry will be designed to deliver the same
levels of operational availability as the Quinitsa
 Cable Design and Contingency Plan
The cables will be inspected regularly and the main
drive cable will be changed annually
Cable design has been scrutinized by multiple
external certified Professional Engineers
Professional Engineers have signed off on the
analysis and design.
In unlikely event of a cable failure a spare will be
swapped out utilizing the shore side equipment that
will be available locally
Cables are designed to be swapped out overnight
with no disruption to the service schedule
Loading and Unloading
 Terminal and Vessel Loading and Unloading
Ramp and superstructure design allow for safe and
efficient loading and unloading procedures for oversized
Double laned ramps at both terminals
Designated passenger loading lane that is separate to
vehicle ramps
Staging, loading and unloading should be more efficient
and safer than current practice
Business Case
 Business Case
Significant savings include a projected 50-60% reduction in
fuel consumption as well as a crew reduction of 3
The simpler vessel will require less repair & maintenance
The total forecasted operating cost savings of the Cable Ferry
versus the existing conventional service is $80 million over 40
years. This equates to a more favourable net present value
(NPV) in today’s dollars of $19 Million.
Detailed Design
Cable ferries are a proven technology. There are
approximately 65 cable ferries in operation in Canada
BC Ferries has approached this project in a very detailed
fashion doing considerable analysis and testing prior to
proceeding with detailed design
There have been several highly qualified companies
involved in this overall project.
Detailed Design
The following companies have been involved in the design, analysis and studies of this
KPFF: Firm of 800 professionals. Note: Among the largest civil and structural engineering
firms on the west coat.
McElhanney Consulting Services: Firm of 400 Engineers, planners & surveyors
Elliott Bay Design Group: Firm of 48 Engineers, designers and support staff
EYE: Firm of 9 Engineers and technologists
Golder Associates: Firm of 3957 professionals
Glosten Associates: Staff of 69 with 60 Engineers, Technicians and Naval Architects
PBA: Firm of 10 people with 5 Engineers
Ryzuk: Firm of 20 people with 11 Engineers and Geologists
Thurber: Firm of 300 people with 100 Engineers and technologists
DSA: Firm of 6 people with 5 Engineers
Archipelago Marine Research: Firm of 175 professionals
Oceanic Consulting Corporation: Firm of 35 professionals including Engineers and Naval
Cascadia Research: 19 biologists and research associates
Rodden Engineering: staff of one engineer
Reliability and Availability
 Technical Statement of Requirements (TSOR) and
Statement of Requirements (SOR)
Key elements are defined in both the TSOR and SOR that form
the basis of the overall design such that the cable ferry will be
built to meet the current operational availability criteria that
the Quinitsa currently delivers.
The TSOR and SOR are available for those who are interested
on our website under the Denman Hornby FAC section in the
public consultation category
Technical Analysis
BCF Project Team
Modelled the equations
of motion governing the
cable ferry system
No modelling
Model used to represent
cable ferry system
Time domain computer simulation, with elements
validated by physical model tests in a wind tunnel and
wave tests in a hydrodynamic model basin
Static weight on butcher twine supported
on a frame on front of tractor
Representation of
response forces
Time dependent, considering added mass and damping of
the ferry and cable in water, stiffness factors accounting
for pre-tension in the cable, dynamic characteristics of the
ferry and cable
Not Defined
Representation of
Applied Forces
Incorporated wind/waves/tidal current effects. Wind
speeds taken from statistical modelling. Wind and wave
forces represented as time varying loads (gusts as well as
sustained speed).
Wind from anecdotal sources, initially
estimated from postcard, later by
empirical equation
Treatment of cable loads
Cable geometry correctly modelled as a catenary, with
Experiments represent cable as a taut
line, butcher twine mechanical properties
assumed same as steel cable. Examples
reference cables in air (whistlerblackcomb)
Sizing of cables
Intact and damage cable configurations analysed for
maximum loads under extreme conditions; scaled by
appropriate safety factor from international recognized
standard (ABS/API)
No clear methology
Treatment of
Environmental Data
Dedicated short term collection in Baynes Sound
correlated with long term data sets available from local
weather stations. Extreme values calculated for 1 year,
50 year, 100 year return period. Wave data correlated
with wind data to develop local wave conditions
Anecdotal references; Building code using
Sisters Island references
Towing calculation, using large offshore
structure as a reference
Project Positives
 The following is a list of the many improvements that this
project should bring over the current service
 Ship should only come out of service once every 10 years with a
much reduced maintenance period
 Modern fire suppression technology (Hi-Fog and remote monitors)
 Two lane off loading with future two lane loading possibilities
 Faster loading and unloading for vehicles and foot passengers
 Gated pet area on board
 Covered and uncovered outside seating
 Greater Handicap accessibility
 Modern marine ramps and pontoons
 Simple and efficient equipment
 Reduced maintenance requirements
 Expanded Denman West ~ more efficient, parking and proper
traffic lane for drop off
Questions and Consultation
 Welcome any Questions
 Prepared several different storyboards representing the
proposed layout of the terminals and cable ferry. We are
requesting your feedback on the design and layout.