Thanks everybody for all replies.
I'm confused because in iron ore slurry pipelines the block valves isn't used at crossings. Normally is changed the project safety factor (0,65) and the construction methodoly is HDD.
I'll spend more time study about this subject.
Thanks.
Hi everybody!
Someone has an experience in river crossing pipeline leak repair? We have some long pipelines installed at Brazil of API 5L X70 PSL2. The pipes has installed by HDD method and some people suggested to install block valves on either side of the river. In my opinion, split the line...