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Hi, API 609 related to Butterfly Valves is divided in 2 categories : A & B. One of the piping classes on my project is giving me the choice between both, for all diameters, and there is no note saying when to use one or the other. I'm guessing it is a matter of fluid. Can someone explain to...

The plant is a LNG terminal, close to the the sea. That is why there is settlement of the whole site. The buried line will never erode because of the waves My mistake, I used the bad word, I meant PE coated ! This is a BOG line, DN150 carbon steel, 900lbs, with external PE coating. I'm not...

The line is buried, that is why it is lined with PE (cathodic protection). The soil is very unstable (along the sea) and is subsiding every year. Point is the line is 500m long, with lots of direction changes, so we'll have to do some of the welds in the trench. And PE lining after that. For...

Hi, I'm working on a gas project, for which I need to install an underground DN150 PE lined CS pipe. I got a client standard imposing the use of concrete sleepers in the trench, around each fitting. Just before and after each elbow, just before and after each tee. Nothing stating the use of...

Thank you. It seems that below a certain diameter (around 6 or 8'') it is cheaper than stainless steel, but it becomes way more expensive above that.

Hi, I need to install in a chemical plant a whole network of vent lines coming from the reactors and going to scrubbers and oxydizer. Client requested to have these lines in FRP (Fiberglass). Can someone tell me what is the installation cost of this kind of pipe. I'm looking for an easy way...

Correct, I'm not the Client, but the Engineering designing the plant. Plant is in France, for an American client. It actually consists in moving an old existing plant from its current location to a new one, and at the same time applying the GMPs. It means that we need to "upgrade" and improve...

Hi guys! I've been working for 6 years now in the Oil&Gas/Pharma industry as a Piping Engineer. I worked on 2 "oil" projects and 1 "bio-pharma" project, and now i've been assigned to a Cosmetics Project. Most of the fluids in this project don't impose a high sanitary level of piping and...