What is Bared tee

  • nikhil_revankar
  • nikhil_revankar's Avatar Topic Author
  • Offline
  • New Member
  • New Member
More
16 years 1 month ago - 16 years 1 month ago #7287 by nikhil_revankar
What is Bared tee was created by nikhil_revankar
Dear all,
I have been going through the piping contract documents, where I found a term called Bared Tee.
Can anybody tell me what is Bared Tee and where & why it is used?

Regards

Nikhil

Please Log in or Create an account to join the conversation.

More
16 years 1 month ago - 16 years 1 month ago #4531 by Jop
Replied by Jop on topic Bared TEE
I think the project document you were reading had to do with the design and installation of a pipeline that would require the use of a "Pig".
A "Pig" is used in pipelines for many reasons including:
Batching - A ball or cylinder shaped pig to separate one product from another.
Calibration - One or more ball shaped pigs to quantify the flow amount.
Cleaning - Could be a simple plug shape with grit or blades on the sides or a more complex segmented pig with scrappers and pusher cups.
Testing - Pigs that pass through the line for the purpose of checking for corrosion or even weld quality.

You want the "Pig" (any of them) to pass any branch (TEE) in the pigged portion of the line. Branches are provided to divert the liquid or gas flow just after a pig launcher or pig catcher. The bars of a "Bared" TEE are welded across the side outlet of the bared TEE and flush with inside diameter of the straight run of the TEE in such a manner as to not allow a pig to become stuck in the branch.

Go here for more detailed information about "pigs"
www.ppsa-online.com/about-pigs.php

Do it once and Do it Right

Please Log in or Create an account to join the conversation.

More
16 years 1 month ago - 16 years 1 month ago #4532 by gpsvn
Replied by gpsvn on topic The barred tees are used
The barred tees are used to attach pig launchers /receivers to pipelines. The barred tees guide the pigs through the branch and prevent them get into the branch.

Pig launchers and receivers piping required good engineering, this is one of the most dangerous parts in pipeline operation. If you are not familiar with it, please hire some who are.

Please Log in or Create an account to join the conversation.

More
16 years 1 month ago - 16 years 1 month ago #4567 by juan1977
Replied by juan1977 on topic Pig launchers and receivers piping
Pig launchers and receivers piping required good engineering, this is one of the most dangerous parts in pipeline operation ... from gpsvn.

___________________________

I dont know about the pipeline, but in petrochem pigging is NOT the most dangerous part. Its a routine activity normally perform by an Operator during the running of the plant. And they normally received training for its use and operation as part of the commissioning work.

Please Log in or Create an account to join the conversation.

More
16 years 1 month ago - 16 years 1 month ago #4574 by gpsvn
Replied by gpsvn on topic I dont know about the


I dont know about the pipeline, but in petrochem pigging is NOT the most dangerous part. Its a routine activity normally perform by an Operator during the running of the plant. And they normally received training for its use and operation as part of the commissioning work.


In my area, the offshore oil & gas pipelines are designed for high pressure, you can judge by the flange rating ranging from 600# to 1500#. The pig trap enclosures therefore having interlock systems ensuring that they can not be opened under pressure. The area behind the pig trap must be clear, just in case the pig propelled out of the trap like a projectile, it should not aim toward human occupied area. All of the isolations require double block and bleed.

In the past, i did some work on Lub oil blending plants and the batching / cleaning pigs operate under low pressure. However, it does not mean that it's not dangerous.

Please Log in or Create an account to join the conversation.

More
16 years 1 month ago - 16 years 1 month ago #4575 by juan1977
Replied by juan1977 on topic The key phrase is "most
The key phrase is "most dangerous" with emphasis on the word "most". I havent come across major disaster in the oil industry attitbuted to pigging. And everything inside the plant is consider dangerous including the use of SCBA consider part of safety. Tightening of flanges, disassembly of trays, repair of rotating equipment, hydro of pipe, and a number of other plant activities have a potential to cause injury - but they're not consider "most" dangerous.

Reactor work say involving the change-out of catalyst under inerted environment i believe is more dangerous than pigging or working on the mods of supply line for an ethylene service is more dangerous than pigging or performing hot-work in confined space and i can cite dozen more riskier activities at the plant that is far more dangerous than pigging - basically a routine activities in petrochem industries.

Please Log in or Create an account to join the conversation.

Moderators: Jop
Time to create page: 0.233 seconds