River Crossing Pipeline Leak Repair
River Crossing Pipeline Leak Repair
(OP)
Hi All,
Anybody had an experience in river crossing pipeline leak repair? We are dealing with crude Export pipeline of API 5L X60 PSL2 material of 18" size. We are currently in design stage and would like to consider a proper provision for this repair in case of future leak occasion. We are dealing with high H2S heavy crude oil.
Anybody had an experience in river crossing pipeline leak repair? We are dealing with crude Export pipeline of API 5L X60 PSL2 material of 18" size. We are currently in design stage and would like to consider a proper provision for this repair in case of future leak occasion. We are dealing with high H2S heavy crude oil.





RE: River Crossing Pipeline Leak Repair
RE: River Crossing Pipeline Leak Repair
Thanks. We did specified for HDD bore for the installation with block valve on both side. And with a 3mm CA on the pipe as well. By having all these, it is no guarantee that we can avoid the failure. Plus, this is a critical export pipeline that we need to ensure minimal shut down within its operational life. If there is any new technology that can repair a river crossing pipeline online and insitu, we would want to consider to provide necessary provision during this design stage. Providing a bypass line is our last resort.
RE: River Crossing Pipeline Leak Repair
But if it is truly that critical - redundancy is cheap!! And you might not piss off the EPA so much!!
RE: River Crossing Pipeline Leak Repair
RE: River Crossing Pipeline Leak Repair
RE: River Crossing Pipeline Leak Repair
--Use heavy wall pipe as stated above, in addition to your corrossion allowance.
--X-ray welds instead of testing by ultrasound.
--consider internal coating
--consider automated SMAW welding versus manual welding.
--jeep the piss out of the coating.
RE: River Crossing Pipeline Leak Repair
Automatic welding isn't likely to be economical just to do a river crossing.
The highest risk of failure of an HDD crossing, assuming the installed profile is sufficiently low stress and the exterior of the pipeline was not scratched in the process, is from internal corrosion. Setting a good corrosion allowance and perhaps leaving provisions for corrosion monitoring coupons and future corrosion inhibitor injection is your best option.
If you ever did fail an HDD crossing due to some cause other than corrosion, you would likely NOT want to even think about installing a new HDD in the same place, never mind repairing a damaged one. HDD failure would more likely be good evidence that you had chosen a very inappropriate location to cross that river. It would be better to cut your losses and move to another spot.
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: River Crossing Pipeline Leak Repair
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04