Rollover of Hydraulic Rig and Trailer

A truck was leaving a truck stop just outside of Edmonton, Alberta, carrying a hydraulic drilling rig. The truck had a jeep style trailer attached.

As they exited the truck stop, a major component of the trailer carrying jeep failed. The trailer jackknifed around the truck, pulling the entire vehicle to the side of the service road.

When the trailer reached the edge of the pavement it stopped its sideways motion and tipped, causing the trailer together with the chained down hydraulic drilling rig to roll on its side.

Various contractors were called to the scene, to lift the truck and crane, to cut the fouled hoist cables, and to clean up the spilt oil and diesel fuel  from the accident.

The insurance company was requested to pay for the contractors as well as the cleanup.

An initial assessment was performed to evaluate the repair cost. A secondary assessment was performed to evaluate the cost claims of the contractors and the salvage value. Finally, an analysis of the jeep trailer was required to determine what caused the failure.

It was determined that the cause of failure could be attributed to either a design error or negligence in quality control from the original manufacturer of the fifth wheel.

Truck with rig rolled over on the road, with a crane preparing to lift it.
The original rollover
The rolled rig, in the process of lifting, and in the shop. Trailer also shown
Lifting the rig
Rollover 3
The rig in the shop
Rollover 4
The trailer



Pack-Off Failure Investigation

During drilling, a section of drill pipe unexpectedly failed. This pipe was a rental, and we were asked to determine what had happened.

It was immediately clear to us that the failed end had been highly heated. It had deformed before it failed and separated. This indicated to us that this was a pack-off failure.

A pack-off is a condition where the formation being drilled has a series of hard material layers with soft layers above them. The bore in the hard material is on gauge, and the bore in the soft material opens up larger. The harder cuttings escape into the larger soft bore and pack around the pipe, gripping the pipe and causing a friction stop. In this instance, the friction was enough that a weak section of piping fractured, causing the failure.

In this photograph, the twisting of the hot pipe before fracture is visible.

Pack off Failure

Our latest course has been certified for CE credits.

Our latest course has been certified for CE credits by the Alberta Accreditation Committee.

This course is focused on the effect of Heavy Vehicles in Accidents. What effect does the size of a vehicle have on a accident investigation? More than just changing the physics, the entire regulatory landscape changes drastically. This course is a quick overview of what to look for in terms of code infractions, cargo issues and infrastructure damages that may all be factors an adjuster has to consider when taking on such a case.

We will be contacting local offices during the next few weeks to set up presentations of our course in office, to get your adjusters their CE credits. If you would like us to come to your office to present this course, send us a note.

Heavy Vehicles In Accidents