'Unknown object' is an 8-inch diameter steel pipe casing It made the world's largest boring machine, 'Bertha', grind to a halt last month Officials are in conflict over why no one knew the pipe ...

At the Borusan Mannesmann mill in Baytown, Texas, which manufactures steel pipe and tube products, workers penned letters to President Donald Trump on Tuesday, imploring the administration not to ...

At first, the blame was directed at a steel pipe: On Dec. 3, Bertha's cutting face hit the 8-inch diameter, 119-foot-long casing for a research well drilled a dozen years ago by teams working for ...

Bertha hits steel pipe, stalls. The machine was cruising along at the start of December 2013, ... following a one-week halt to measure and correct a slight deviation off course.

The state should have done more to warn Seattle Tunnel Partners about a steel pipe that tunnel machine Bertha struck Dec. 3, 2013, three days before the giant drill overheated and stalled, a ...

Seattle Tunnel Partners (STP) knew an 8-inch steel pipe was in Bertha’s path two years before the tunnel boring machine chewed through it, according to a new suit filed by Washington state.

Portable pipe-cutting split frames and orbital welding tools complement each other in the steel pipe construction industry because the split frames are used to prepare pipes for the welding ...