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TOPIC: Weldolet: Full size vs Reducing size

5 years 8 months ago #8362

  • newdam07
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what is the difference between full size and reducing size weldolets? thanks!

Re: Weldolet: Full size vs Reducing size 5 years 8 months ago #6950

  • Jop
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Full size means you would have a 6" branch on a 6" size pipe run
Reducing size means you would have a 4' (or less) branch on a 6" size pipe run
These are just two examples.

Go here: http://www.bonneyforge.com/resources/BC.pdf and look at the charts on pages 38, 39 & 40. The charts show "size to size O-Let fittings are available. However this is not recommended for new installations (it is better to use a size-to-size TEE).

Size to size O-Lets are sometimes used on Revamp projects where a new same size branch is required on an existing line. However this is again not recommended. The better choice for size to size branches on existing pipelines is the Split TEE (seen here- http://www.furmanite.com/products/hot-t ... -fittings/)

What is your situation?
More information from you can allow us to be of more help to you.
Do it once and Do it Right

Re: Weldolet: Full size vs Reducing size 5 years 8 months ago #6951

  • newdam07
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Thank you Jop.

I just want to know the difference between the 2. We sent our our pipe iso with instrument connection to the instrument vendor and they came back with a query on what type of weldolet to use, whether full size or reducing size. The question kinda threw me off because the size of the weldolet is provided in the iso, which is 42"x1". So, from your description, I would say that the weldolet is reducing size.

Re: Weldolet: Full size vs Reducing size 5 years 8 months ago #6952

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"The question kinda threw me off because the size of the weld-o-let is provided in the iso, which is 42"x1". So, from your description, I would say that the weld-o-let is reducing size."

Yes that would be a reducing O-Let fitting.

1, It is most unusual to have 1" butt weld piping. Maybe your Instrument vendor intended to have a 1" Thread-O-Let (TOL) connection.

2, Normally the proper terminology for an o-let fitting would be the smaller branch size by the larger run size. In your case an example would be 1" NPT x 42" Sch 20. The sch 20 is only an example, I do not know your actual wall schedule for the header pipe.
Do it once and Do it Right

Re: Weldolet: Full size vs Reducing size 5 years 5 months ago #7026

  • aliciarohail
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"The question kinda threw me off because the size of the weld-o-let is provided in the iso, which is 42"x1". So, from your description, I would say that the weld-o-let is reducing size."

Re: Weldolet: Full size vs Reducing size 5 years 5 months ago #7027

  • Jop
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The proper terminology for an o-let fitting would be the smaller branch size by the larger run size.
In your case an example would be 1" NPT x 42" Sch 20.
Do it once and Do it Right
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