Shipboard Controlled Humidity Protection System
The MV A1C William H. Pitsenbarger is part of the Navy’s Military Sealift Command Afloat Prepositioning Force that provides the U.S. Armed Services with rapid deployment of vehicles, ammunition, weapons and supplies to areas of conflict around the world. The MV Pitsenbarger, operates from the Diego Garcia area in the Indian Ocean and prepositions ordnance for the Air Force. The MV Pitsenbarger is a combination RO/RO and container ship with a LOA 621 ft and breadth 105 ft. Depending on its mission the ship carries 917 container equivalents, 741 under deck and 176 above deck. MSC’s DryTime requirement is that “all” cargo be contained in an environment with a maximum temperature of 85°F, a consistent RH between 40 and 50% worldwide and that the cargo be off-loaded without shore-side assistance.

In 2001, Cocoon, Inc. was contracted to design, engineer, and install the environmental control systems, automated environmental monitoring and reporting systems and deck mounted shelters. Partnering with Munters Corporation, Cocoon engineered and installed the humidity and temperature control and monitoring systems. Partnering with Rubb Building Systems, the tension fabric building shelters that house the weather deck containers were designed and manufactured. Cocoon, Inc. led the engineering and design effort; provided the project management; constructed and installed the shelters. They also created the operation and maintenance manuals; trained the ship’s crew in operation and maintenance; proved compliancy and performance to MSC systems; and supported those systems globally. The project was on-time, on-budget, and continues to meet all MSC DryTime requirements. In September, 2006 Cocoon, Inc. was hired to upgrade the shelters and additional systems. This work was performed in China.

MSC Shipboard Project Features

  • Maintain a constant condition within the shelters of 85°F and between 40 and 50% RH worldwide
  • Automatically monitor environment and hold conditions, collect data and automatically report to Military Sealift Command headquarters Washington, DC
  • 2 shelters @ 86.5’W x 48’L x 40’H 4,152 ft2
  • 1 shelter @ 86.5’W x 48’L x 31.5’H 4,152 ft2
  • Design loads: 100mph wind, exposure D, per ASCE 7-95, 15 PSF roof live load, inertial forces: 0.1G longitudinal, 0.5G transverse, 1.15G vertical, able to withstand rolling seas and driving rain
  • Approved by registered Professional Engineer
  • Cocoon, Inc. supports project globally
  • Shelters operate independent of any outside assistance with only ship’s crew
  • Maintained with common tools, 60 days of spares onboard, 30-day shipment of any part, with minimal maintenance requirements
  • Steel structure with a PVC flame resistant cladding two layers R-11 insulated system
  • Material is to withstand worldwide ultraviolet effects for 5 years without significant material degradation or failures
  • Innovative track-rolled anchoring system allows shelters to operate without lashing and in challenging weather conditions