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Thanks, I will look into that. [smile]

Makes sense - thanks will do the calcs

Thanks cvg By "lifts" do you mean to cast the infill in layers to just above the centerline of the pipe?

The longest sleeve section is 61m long and is theoretically straight. I'm not sure what lengths can be achieved and what wall thicknesses are used. I will give that option some thought - Thanks. The buoyancy could likely be sorted out with a few small spacers as you indicated, as the vertical...

The lesson has been learnt - assume it will leak![smile] This is a gravity fed raw water steel pipe with Epoxy lining inside. Design pressure 500kPa. We are a bit too far down the line to try and change the piping system with a lining although that suggestion is a good one. What lining method...

Thanks LittleInch The design was originally for other pipes and services to be able to use the sleeve. Due to the pipe jacking contractor being roughly 400mm off course, the installation had to be adjusted, thus it is a less than ideal situation. Where access to the pipe originally existed, it...

Hi I have a problem with pipe jacking sleeve joints that are letting in ground water. Ground water level is approximately 1m above sleeve invert during very rainy season. The sleeves are "in the wall joint" types - SANS 677. The seals that were fitted must have been damaged during installation...

Thanks- We are about to get soil resistivity tests for the pipeline route. The soil seems to be mostly sand, rock and gravel. We have an added challenge of overhead powerlines crossing and running parallel to the pipeline route, so cathodic protection is most likely going to be needed. Apart...

Wow - thanks for all the info and advice. I will check out the internal sleeve/liner idea, as the reason for flanging was partly to ensure a good internal coating. Our client may consider other options. The line is 25bar, so HDPE is not an option. I would love to not flange, but project timeline...

Thanks, do you have any examples where flanges were used and this happened?

Hi Does anyone have any experience in the use of flanged joints in a buried steel raw water pipeline? Is it a good idea? Has anyone done it? If so, what problems were found? We are looking at 8km of 600NB pipe, with some above ground and some buried. The pipe has an internal epoxy coating...