Tee vs weldolet

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16 years 6 months ago - 16 years 6 months ago #7180 by gpsvn
Tee vs weldolet was created by gpsvn
Inspired by the "Tee or Stub", I'd like to raise this question, what are the reasons for selecting tee or weldolet. Each company or project has its own piping specifications with branch tables, clearly define the use of tees and weldolet.

What are the logic behind these branch tables, would anyone give me a clue.

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16 years 6 months ago - 16 years 6 months ago #4192 by Jop
Replied by Jop on topic Tee vs weldolet
I think you will find that the answer to your question is "a balance between functional integrity and cost.
Remember the ASME B31 Code recognizes stub-ins, stub-ons, TEE's and Weld-o-lets when the pressure and temperature relationship allows.

Do it once and Do it Right

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16 years 6 months ago - 16 years 6 months ago #4238 by hernan.rizza
Replied by hernan.rizza on topic First, each company has their
First, each company has their own criteria, this is a fact, the reasons are many (e.g. weather were they have their plants, national regulations, local markets, etc), in second, they are options for different things. With an o'let in high pressure you probably are going to have a very high heat input in the weld, not with the TEE (you have much more complication if you are thinking in use a 45°branch), but on the other hand if you have a big run and a small branch and you want to use TEE red. and another red... and so on, your spool piece is going to be very big with no sense because you could use an o'let reducing the space. One important thing is that the most part of companies that construct this kind of pieces not have their engineering designs studies and they copy from others very well known that have the studies of each part. Remember that these pieces are non std. and there are no ASME/ANSI that regulate their design. I think that using a TEE or a TEE red. up to one half of the NPS of the run is the best option, if you have less, you could think in an o'let branch.

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16 years 6 months ago - 16 years 6 months ago #4243 by gpsvn
Replied by gpsvn on topic I'm starting a new job
I'm starting a new job and have a look through the company's piping specifications. They use a lot more weldolets than other companies do. For example, a 24" x 30" branch is a weldolet, not a a reduced tee. This will be bulky, heavy, lot of welding and heat inputs.

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16 years 6 months ago - 16 years 6 months ago #4244 by Nipper
Replied by Nipper on topic Thats interesting. I am currently
Thats interesting. I am currently working on a deluge system run in Cu-Ni . The spec branch table specifies equal tees only. Any reducing branches require a saddle or weldolet. In my opinion the ammount of time required in fabrication to cut out a coupon for a saddle and weld it would mean that a reducing tee would be a more logical choice. As is many times the case, the spec comes from the client and there is little we can do to change this.

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16 years 6 months ago - 16 years 6 months ago #4250 by gpsvn
Replied by gpsvn on topic 1. Knowing that most weldolets
1. Knowing that most weldolets are made with the base that covers a range of header sizes but I could not find any reference to the ranges. I did a few Google searches and found nothing. Will the forum members point me to a right direction.

2. Usually, I specify a weldolet as header size x branch size - schedule. At my new job, everyone (well, most of them) specifies it as header size - schedule x branch size - schedule. I am wondering if specifying the header schedule would do any good (or harm) ?

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