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High Pressure Pipeline – Carr Civil Engineering https://carrcivilengineering.co.uk Fri, 26 Feb 2021 12:14:13 +0000 en-US hourly 1 https://wordpress.org/?v=6.2.2 Installation of Zinc Ribbon & Arc Strike Inspections on HP Pipeline PO86. https://carrcivilengineering.co.uk/installation-of-zinc-ribbon-on-high-pressure-gas-pipe/ Fri, 05 Jul 2019 10:25:00 +0000 https://carrcivilengineering.co.uk/?p=1040 All of the team have been working at Crowthorne, on the zinc ribbon installation. The reason for the zinc ribbon installation is to depreciate the AC current on the HP pipeline. We have installed the zinc ribbon parallel to the pipeline on both sides & at pipe depth. Pipeline was exposed at 20 metre intervals, making sure that the pipeline was supported in 3 metre sections. Arc strike inspections were carried out by the client, if there had been any arc strikes present then a P11 assessment would be carried out, the results of this would determine whether this section of pipeline would require blasting and recoating.

The digging methodology used on this project was a stepped battered excavation, hand digging within 1 metre from the side of the pipeline, due to the project being under SW2 permitry.

 

 

]]> PO86 Arc Strike Investigations & Epoxy Shell Installation https://carrcivilengineering.co.uk/po86-arc-strikes-on-hp-pipeline/ Mon, 03 Jun 2019 10:15:56 +0000 https://carrcivilengineering.co.uk/?p=1021 Due to a recent heath fire,  multiple plumes of  dense, thick, acrid smoke rose up into the high voltage overhead power cables, resulting in multiple arc strikes travelling back down through the carbon within the smoke,  striking the HP Pipeline parallel to the high voltage overhead cables.

After excavations were carried out & the pipeline had been surveyed by the client via a P11 assessment, the results of this were sent off to a third party mechanical damage expert, and they advised that an epoxy repair shell should be fitted to the pipeline. See below photographs.

Arc strike found

P11 Assessment

Epoxy shell blasted to specification.

Epoxy shell being centralised.

Epoxy shell being filled.

Recoated shell to client specification.

 

]]> Installation of Aerial Markers along High Pressure Pipelines. https://carrcivilengineering.co.uk/installation-of-aerial-markers-along-high-pressure-pipelines/ Wed, 10 Apr 2019 10:20:47 +0000 https://carrcivilengineering.co.uk/?p=993 Teams are out this week installing aerial marker posts along the gas pipeline, to enable the aerial teams situated in helicopters to locate the pipeline with ease, and if anyone is working on or near the high pressure pipelines the encroachment can be reported.

Each team is supplied with an official utility map, showing the location of the pipelines, prior to the works and a grid reference where to install, the team will then confirm & identify where the pipeline is via a RD7100 survey, this picks up the pipeline on CPS mode to the correct depth & line of the pipeline.

Landowners are contacted prior to posts being installed on their land and permission granted.

Hand dig methodology to a depth of 500mm, install & backfill.

 

 

Picture of area for Aerial Marker to be installed.
Aerial Marker installed.
Hand dig down 500mm, Aerial Marker in Situ.
Aerial Marker completed, hole has been backfilled, area tidied.
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