Buried Insulating Joint
Buried Insulating Joint
(OP)
Have you ever seen buried Insulating Joint?
Client asked it in order to have his buried gas pipeline potentially isolated from new buried branch.
Is it allowable to bury it? If so, is it effective underground?
Client asked it in order to have his buried gas pipeline potentially isolated from new buried branch.
Is it allowable to bury it? If so, is it effective underground?





RE: Buried Insulating Joint
RE: Buried Insulating Joint
Is it a good idea - not in my opinion as you can't see any leakage and unless the branch is also cathodically protected, it can suffer increased corrosion risk if there is current leakage from the main pipe and any coating damage on the branch pipe. It is also harder to calculate and restrict bending stress on buried tees which can overstress your IJ quite easily.
I don't really understand the clients concern though.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Buried Insulating Joint
RE: Buried Insulating Joint
RE: Buried Insulating Joint
I've even seen launcher and kicker valves that aren't buried... and doubled trap isolation valves, double kicker valves, even on the vents, and pig launchers located so close to the center of the plant facilities that somebody thought they needed a blast wall between the launcher opening and plant piping so it would be safe. Get that... "be safe" ???
Personally I think doubled valves over-complicate the launching procedures so as to make them actually more unsafe ... except maybe in the case of poisonous gases I would use ONE double-block & bleed valve. Trying to remember to close 2 valves here, two valves there... and the first thing that happens is that when the pig gets stuck, they just open both of them. Too much work... next time they'll only close one, then the guy coming along expecting to see both of them closed ... oh oh.
There's a lot of ways you can skin a cat, but most of them ... not good.
Independent events are seldomly independent.
RE: Buried Insulating Joint
"I've even seen launcher and kicker valves that aren't buried..."
What client do you work for that ALLOWS you to bury valves?!
"... I would use ONE double-block & bleed valve"
So which kind of single piggable valve would you use for this? Good ol' slab gates are NOT DOUBLE ISOLATION & BLEED (see latest API 6D) valves that meet most current pipelines safety specs.
RE: Buried Insulating Joint
I can post a kml file where you can zoom in on them and see the hand wheels sticking out of the ground. There must be millions of buried valves on pipelines. I would never use a gate valve on a launcher, takes too long to operate them and you just might slice a pig in half.
http://c-a-m.com/forms/Product.aspx?prodID=3e9de0a...
Independent events are seldomly independent.
RE: Buried Insulating Joint
The WKM valve is one of the best I've ever used in pig trap or isolation usage and works very well.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Buried Insulating Joint
http://www.c-a-m.com/forms/Product.aspx?prodID=5b1...
Independent events are seldomly independent.
RE: Buried Insulating Joint
RE: Buried Insulating Joint
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Buried Insulating Joint
Any way... another great reason to put IJs on the opposite side of the trap from the pipeline being pigged!!!
Independent events are seldomly independent.
RE: Buried Insulating Joint
RE: Buried Insulating Joint
https://www.google.ae/?gws_rd=cr&ei=0AwgUpDkG5...
Independent events are seldomly independent.
RE: Buried Insulating Joint
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Buried Insulating Joint
I'm new in the fórum, and kind of lost. Don't know where to find the topic I'm interested in. I'd appreciate if someone gives me some guide. I have to design a cathodic protection system for buried pipelines. What could I read about this, what codes??
RE: Buried Insulating Joint
You can read the following:
NACE SP0169
ISO 15589-1
Peabody's Control Of Pipeline Corrosion
oh, and you could try using the search posts box to the top right
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.