Tees straight and reduce
The main purpose of Tees is that their primary function Tee is to create an angle 90deg from the main pipe. There are two options in the form of an equal tee as well as the reducing the tee. Equal the tee (or straight tee) is utilized because it has the same size as the run-pipe. The reducing tee is employed because the branch is smaller in diameter than the runpipe.
Dimensions and Standards
When we speak of an tee NPS 3 x 2, stainless straight tees or equal tee is designed. If a tee is NPS 3×2, a reduced tee is the intention. While, in official terms, a reducing the tee is indicated with three diameters, which is 3 x 3 x 2. (A B x A). The measure A and B is The Nominal Pipe Size of the Run-Pipe. The C is the measure for The Nominal Pipe Dimensions of the Outlet.
This is actually a redundant designation and comes from the time when tees were sold in 3 different sizes of diameters like 4 3 x 2 (A B C). In this case, of course it is imperative to mention 3 different sizes.
These kinds of tees are likely to be unavailable. Utilizing a similar tee by using an eccentric or concentric reducer is the current procedure.
Straight or equal buttwelding Tee is offered for all diameters that are common.
A Reducing Tee is not as numerous diameters are not manufactured or are not manufactured.
For illustration.. Reduced NPS 6 x 4 tee is a standard product for many suppliers, but an reducing tee NPS 16 x 2 will not offered by any retailer.
It is also not economically feasible to make use of an NPS 16 t-shirt with an NPS 2 outlet. In the event of such a situation, the Branch Fitting is used or an Branch Connection will be established.
Cross Tee
In addition to the standard tees, there are also straight and cutting crosses. Straight crosses are typically standard items, while reducing ones are typically difficult to locate. I’ve never worn those T-shirts and have not seen in use or at all in the chemical or petro industry. They are likely to be utilized when there is a shortage of space, for example in revisions, in the shipping industries, etc.
Wall Thickness Tee
In the form of a tee wall thickness is an important element. ASME B16.9 only defines the end-to-end dimensions, the center-to-end dimension as well as some “squareness” tolerances for dimensional measurements.
Wall thickness in the location of the weld line is also standardized, however it is not the same throughout the fitting. The standard specifies that the minimum tolerance should be within 12.5 percent of the minimum required diameter of the wall. The maximum tolerance is stated only at the end of the pipe.
There are many suppliers of welding Tees (and elbows) offer a different schedule with a larger in thickness to ensure that a sufficient wall thickness, following the forming it, remains. In Tee’s the radius of the crotch (T) differs between different manufacturers and some even establish it as a standard, 1.3 times the thickness of the wall to ensure the crotch is maintained.
…it is anticipated that a part of the fittings that are formed may need to be more robust than that of the pipe the fitting intended to be connected.
Since there isn’t a upper limit for certain components in the fittings, the buyer himself must specify his specifications. Based on the specifications of the customer the manufacturer must confirm that the made tee conforms to the requirements of the client.
He is able to do this with additional drawings, or with wall thickness measurements, etc. Verified by an independent third party or by a customer’s inspector.
These additional tests are expensive and cost money, therefore it could be that the cost of these additional tests, several times more expensive, than the tee itself.
