Page 40: of Maritime Reporter Magazine (November 1998)

FERRY BOAT REPORT

Victaulk Fittings Help Todd Pacific Achieve Economies Of Modular Construction

With a major metropolitan area bisected by

Puget Sound, and major islands dotting the vicinity, Seattle, Wa. relies on RoRo ferries for a great deal of its public transportation needs.

Service is provided to 20 different locations throughout the Seattle/Tacoma metropolitan area, with more than 400 daily trips carrying an annual total of more than 23 million passen- gers.

To meet the demand in the early 1970s,

Washington State Ferries commissioned ships in a new Jumbo Mk I class. Jumbo Mk I class vessels are 440 ft. (134 m) long, and capable of carrying 2,000 passengers and 206 automobiles at 18 knots.

In 1988, the Washington legislature con- firmed the need for an even larger 460-ft. (140 m) ferry, Jumbo Mk II class, which would carry 2,500 passengers and 218 automobiles at a speed of 18 knots. The first ferry was delivered in August 1997, the second in June 1998, and the third is to follow within the next year. MV

Tacoma and MV Wenatchee are presently in ser- vice on the Sound, while MV Puyallup is expected to be completed in early 1999. All three vehicles were built at Todd Pacific

Shipyards in Seattle.

Chief engineer Norman Whyte managed the engineering department during the devel- opment of the production drawings which were formatted to meet modular construction build- ing methods and maximize pre-outfitting of the ship structure before assembly at the building berth. Mr. Whyte explained that "the old tradi- tional method was like stick building and

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MV Puyallup under construction at Todd Shipyards. expensive. With the Jumbo Mk lis, the ferry is divided into 116 steel units. Piping, ventilation, lighting, floor plates and painting are complet- ed on each unit to achieve maximum pre-fit, aiming for 86 percent completion before each unit is attached to other units."

A Jumbo Mk II ferry contains more than 56,400 ft. of pipe. Connecting this pipe are more than 8,000 Victaulic couplings and fit- tings for roll-grooved pipe. "Todd Pacific

Shipyards is using roll grooving in selected pip- ing systems and designed the piping drawings to suit the roll grooving method. To use the

Victaulic roll groovers we set up a fabrication shop to prepare the pipe efficiently," said Mr.

Whyte.

Get Into The Groove

The grooved end system involves cold-rolling a groove into the pipe to receive a bolted cou- pling that incorporates a synthetic polymer gas- ket which in turn seals the connection on the outside diameter of the pipe. A resilient C- shaped gasket provides a leaktight seal that is further strengthened by compression when the coupling is tightened and by subsequent line pressure or vacuum. The groove where the pipe and fitting engage forms a self-restraining joint 40 Circle 242 on Reader Service Card

Victaulic grooved piping system, showing y-joint.

Maritime Reporter/Engineering News vmumwtM*****^""""