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New Hydroactive Bulkhead Shaft Seals Developed for the US Navy Ready to Go Commercial.
Medford, MA - February 2, 2010 /PRAvenueNW/ -- On 12 October, 2000, the USS Cole was attacked whilst refueling in Aden. The ensuing explosion left a 40-by-60-foot gash in the port side of the destroyer. The bulkhead shaft seal, designed to prevent flooding between compartments along the main propulsion shaft, failed catastrophically placing both the ship and its crew in severe danger. Subsequent US Navy inspections concluded that their nominally rotating seals were being consistently activated prematurely, leading to early and excessive wear, and preventing the seals from fulfilling their intended purpose. A new design was sought.
Midé Technology Corporation (Medford, Massachusetts), in response to the US Navy’s request, has successfully designed, developed, tested, and installed non-rotating bulkhead shaft seals on US Navy ships. Following the successful adoption of the Hydroactive bulkhead shaft seals, Midé now intends to offer it on a commercial basis. Andrew Cutler, Director of Systems Development at Midé offered, “from tugboats to tankers, this smart seal technology has unlimited benefits for both Naval and Commercial shipping”. One major advantage over existing seals is the employment of innovative “smart” hydrogel technology.
Midé’s President, Dave Gilbert stated, “This non-rotating, smart hydrogel seal does not contact the shaft during normal operation, and only activates when exposed to water. It’s sealing force actually increases as water pressure increases”. Additional tests confirmed that the seal, when engaged, enabled shaft operation for a minimum of 14 days when a compartment is flooded, without any limitations on shaft speeds.
In the absence of water, the seal resets itself, allowing repeated use without maintenance or replacement. Since the seal is stationary with respect to the shaft, and nominally not in contact with the shaft, it has excellent wear characteristics, thus offering a significant “life cycle cost” advantage over competing designs, along with the safety value it offers its host ship. The design also allows shaft / bulkhead alignment requirements to be eased, which will lead to substantial shipbuilding cost savings.
Extensive performance, shock (MIL-S-901D, Grade A), vibration (MIL_STD-167-1A) and sea-trial testing concluded that the Midé seals outperform competitor designs with leak rates substantially less than the Navy’s allowable leak rate of 1 US pint/minute.
Currently, Midé’s patent pending design is approved for both forward and retrofits on the Arleigh Burke (DDG-51) class destroyers and is installed on several DDG-51 ships. The seals, which accommodate a 20 ?” diameter shaft, are designed as a “drop-in” replacement for the currently installed, failing diaphragms. A novel “Yoke” design offers significant cost and weight saving has completed qualification testing for a 10” (254mm) shaft size while testing on a 29.92” (760mm) shaft size unit is in progress. This design eliminates the need for a heavy housing and allows for installation without the need for riggers.
After qualification of the 29.92” unit, Midé will offer a full range of bulkhead shaft seals, and stern tube seals in the not too distant future, a boon for both the navy and commercial shipping alike.
About Midé
Midé Technology Corporation is an engineering company that develops, produces, and markets Smart Technology products and materials - primarily for the marine, aerospace, automotive, research, and manufacturing industries.
www.mide.com
Media Please Contact:
David Gilbert, President
Midé Technology
Phone: +1 781.306.0609 ext 224
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