Barnhart Crane & Rigging was commissioned to transport an 800,000-pound (363 tonne) depropanizer column from its manufacturing site to the construction site in Texas, USA.
The 317 foot (97 metre) vessel was one of nine components to be transported by Barnhart as part of the job. After the column was placed on Barnhart’s Goldhofer transporters at the fabrication shop in Houston, the oversized cargo was driven onto a barge and transported by water to Freeport, Texas. From there it was a 50 mile (80 km) overland journey to the construction site in Old Ocean, Texas, where a fracking unit is being built.
According to J.C. Lake, operations manager at Barnhart’s Houston branch, “Everything is always a challenge with pieces this big.” The biggest challenge presented was moving the out-of-gauge piece across a bridge spanning the San Bernard River. “The bridge engineers told us we were too heavy for the one bridge,” Lake said.
Due to the size and weight of the vessel, along with weight restrictions of the bridge, the Texas Department of Transportation indicated that both spans of the bridge – all four lanes – should be used for the crossing. Barnhart used a paved crossover to get the load separated. Ten road signs had to be removed around the bridge to accommodate the crossing. Both ends of the column vessel were on 300-ton turntables to help manoeuvre the column.
There was enough length between the bolsters to get the two trailers on each bridge span. While the bridge was closed to north and southbound traffic, the load made its way across the bridge at 5 mph. It cleared the guardrails by approximately four feet. Once across the bridge, Barnhart used another paved crossover to get the load back together. At the construction site, the cargo was self-offloaded onto beams and jack stands.