On the 7th of June, CR commenced a pipe cleaning project using an IPV4060 in a 500mm Ø schedule 40 pipe reinjection line for Mighty River Power, at their 140 megawatt Nga Awa Purua Geothermal Power station, north-east of Taupo in New Zealand.
Lyle Engineering from Rotorua removed the lagging and cut and removed the elbows to allow the IPV entry, as well as reinstating them after cleaning operations were completed. The first section had a mitre joint that redirected the pipe to a steeper grade. The IPV needed to travel through this join without the carbide cutter tips creating swarf from the inner pipe wall. The cutter was turned off briefly, with the outer cutter cones in a horizontal position as the IPV short stepped through the join. The occlusion at this point was minimal.
There were varying degrees of obstruction in the pipeline and the hard material cone cutters developed for Alumina refinery pipelines made short work of the silica. The IPV was launched at 3 locations in both directions. Access to the last entry point was a challenge, as the trucks had to be backed a long distance down a steep, winding pumice and clay forestry track. The last section of pipe cleaning was completed late afternoon on Friday the 14th of June and the IPV was recovered and packed up in in the dark as wet weather was threatening and the trucks had just got to the top of the track as the rain started to come down.
I’d like to thank Dion Ayers and Charles Aramoana for their help on this project.
The full article can be found in Catalyst 17