JMS Naval Architects · 70 Essex Street, Mystic, CT 06355
P: 860.536.0009 · © 2017
Proud to be a GSA Contract Holder
and Veteran-Owned Small Business since 1988.
JMS Naval Architects has completed the design of a 128.0 m (420 ft) by 37.5 m (123 ft) modular floating dry dock for an undisclosed client.
The dry dock is designed to be built in three phases. One 60.8 m long section is already under construction, and two additional 36.8 m long end sections will be constructed separately and joined to the dry dock at a later date to create a 128 m long dry dock. The first 60.8 m section of the dry dock is designed to be fully operational as a stand-alone dry dock with a lifting capacity of 3,800 tons. The additional end sections will increase the lifting capacity to 5,700 tons and ultimately 7,500 tons. JMS also designed the dry dock structure and systems to be capable of operation in ice conditions.
The wing walls are 3.5 m wide by 9.2 m high and run continuous through the midbody of the dry dock and stop two frames short of the end of the 3 m deep pontoon to create an apron. Each modular section of the dry dock has an access through the wing walls on both the port and starboard side. A safety deck is located in the wing walls at 7.88 m above the baseline. Ballast tank vents extend below the safety deck to form an air cushion. The deballasting and submergence operations are controlled from a raised control platform installed on top of the starboard wing wall of the center module. The ballast system is capable of submerging and reballasting from a 0.3 m freeboard to an 8.1 m depth over the deck in approximately 70 minutes each direction.
JMS developed the complete engineering and design package, including all detail structural design, tankage, and outfitting design. Systems design included the ballast system, seachest arrangement, equipment specification, pump and discharge piping systems. JMS also designed the power system including generator arrangement, fuel tank arrangement, and electrical and piping systems one-lines. The dry dock will be built and operated as a classed dry dock through Bureau Veritas (BV). The structure and systems have been designed to BV Rule Note 475, and will be built under survey by BV.