PFlow Industries, Inc.
Since 1977, PFlow has been solely devoted to the design and manufacturer of vertical reciprocating conveyors (VRC’s) material handling equipment, systems, and specials. As the VRC pioneer, PFlow has led the industry from the start.
6720 N. Teutonia Avenue Milwaukee, WI, 53209 USA
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PFlow VRCs installed in concrete shaft ways of the Seattle Tunnel Project

On February 4, 2019, the much-anticipated Seattle Tunnel opened for north/south vehicle traffic along the Seattle Harbor, connecting the south end of downtown near the Seahawks and Mariners stadiums to the north end of downtown near the Space Needle.

The tunnel features stacked roadway decks with maintenance and emergency egress areas on both sides of enclosed roadway decks. One of the design challenges was to facilitate the transfer maintenance vehicles, tools, and materials between the two-level roadway decks without interrupting traffic.

The solution was provided by PFlow Industries, Inc. with two high capacity VRCs at each end of the north/south tunnel. PFlow consulted with the tunnel project engineers early in the design stage to help prevent any unforeseen obstacles. PFlow’s engineering expertise and “Buy American” capability helped make it easy for the State of Washington to go with PFlow! Both PFlow VRCs were installed in concrete shaftways, the south VRC was placed into the shaftway using a crane from above, while the north VRC was erected in the capped off shaftway. Both PFlow VRCs allow maintenance personnel to transfer their vehicles, tools, and materials between the two-level roadways inside the tunnel, ensuring that the new tunnel keeps traffic flowing beneath the Emerald City!
The tunnel spans a distance of 2 miles, and with a diameter of 57’, it is the 2nd largest tunnel in the world!