Battery Maritime Building & Soissons Dock Ferry Slip Rehabilitation

Soissons Dock Ferry Slip (Governors Island, NY)

Project:   Battery Maritime Building & Soissons Dock Ferry Slip Rehabilitation
Type:  Ferry Slip
Owner:  The Trust for Governors Island


Stafford Bandlow Engineering provided mechanical and electrical engineering services for the replacement of all mechanical and electrical equipment for four historic ferry slips: Two slips are located at the Battery Maritime Building in Manhattan, NY and two slips are located at Soissons Dock on Governors Island. Services included an in-depth scoping inspection, development of a Design Report, preparation of plans, specifications and cost estimates for the design of all machinery and construction services.

The scoping inspection identified significant degradation of the original equipment resulting in an overall loss of integrity and operational reliability from a mechanical standpoint. This led to the design of a complete replacement of all mechanical machinery and emergency replacement of the sheave trunnions for one ferry slip.

The original machinery consisted of a unique arrangement of wire ropes, sheaves, counterweights, and winches which served to raise and lower the slip to allow for the berthing of vessels. Mooring devices were provided to secure the slip to the vessel thereby allowing the slip to move will the vessel due to wave action and freeboard do to loading or unloading the ferry without transferring live load to the machinery. The existing worn components were upgraded and modernized to provide for reduced friction, greater reliability and longer service life without altering the historic appearance of the structures.

The electrical systems associated with the ferry slips were upgraded including a new motor control center, operators control station and the associated ferry slip operating logic. The work included the integration of this control system into the existing operating system and the specifying of a motor control center with protective relaying local control and control station interface. The design also included replacing the existing wound-rotor motors and control panel with squirrel cage induction motors with VFD control.