UNS S31803 Butt Weld Tee

What is UNS S31803 Butt Weld Tee

UNS S31803 butt weld tee is an important pipe fitting that the shape is T which has two outlets at an angle of 90° each and one main connection line. And it's a pipe that has adjacent outlets and used to connect pipes at 90° angle.

For the butt weld tee pipe fittings are ends in plain or beveled, connected by butt welding process. Which could bear higher pressure than the other connection types,especially the material of UNS 31803 have more benefits. Butt weld tee dimensions shall be specified in pipe DN and thickness in schedule, where socket weld tee or threaded tee thickness specified in pressure class ratings.

The material of tee pipe fitting have plentiful just as carbon steel & stainless steel & alloy steel what we can provide and PVC & brass & aluminum what are not our major but can use into projects as well. Commonly UNS S31803 butt weld tee used for oil & gas projects and commercial & industrial applications.

Different Types Of Tee Pipe Fitting

There are many types of UNS S31803 butt weld tee , each having a different purpose. The most common and important type is the "Tee" which has three outlets two lateral (side-by-side) and one central outlet. Here are some different types of tees for reference:

Equal Tee

Equal Tee has a three outlet, and is used to divide water flow from one line into two different lines without splitting it evenly between the two paths. The central outlets are usually placed lower than the lateral ones so as to allow for maximum usage of available space on top of or below ground level since this tee is usually used for outdoor applications. It used most commonly with material carbon steel as A234 WPB and stain less as 304L and UNS S31803 butt weld tee.

Reducing Tee

Reducing Tee takes the normal tee design one step further by allowing the primary outlets to be connected together in a parallel fashion, so as to divide water flow between the two paths. This type of tee is usually used when both lateral openings need equal distribution and sharing of water pressure.

Lateral Tee

Lateral Tee is a type of tee that has only one central outlet and no lateral or side-by-side outlets. Most often than not, this variant is used to divide water flow into three different baths: the central opening ending up to an individual hose or pipe while each of the other openings lead to another hose or pipe. And the material mostly on carbon steel A234 WPB&A105N and stainless steel A316L&UNS S31803 butt weld tee in different applications.

ASME B16.9 Butt Weld Tee Production Standard

Standard Scope

Butt Weld Tee production standard is ASME B16.9. The standard includes specifications of  NPS 1/2 to NPS 48 (DN15-DN1200) factory-made wrought butt welded pipe fittings overall dimensions, tolerances ratings, test methods and markings.

Material Types Referred

Wrought fittings covered by this Standard shall be in accordance with ASTM A234, ASTM A403, ASTM A420, ASTM A815, ASTM B361, ASTM B363, ASTM B366.

Supply Range for Butt Weld Pipe Fittings Refer ASME B16.9

Standard: ASTM A234, MSS SP-75, ASTM A403, ASTM A420
Types: Elbow, Tee Equal and Reducing, Cap, Concentric/Eccentric Reducer
Size Range: 1/2”, 1”, 2”, 3”, 4”, 6”, 8”, 10”, 12”, 16”, 20” to 48”.
Thickness: SCH 10, SCH 40, SCH 80
Surface Coatings: Black Painted, Varnished, Epoxy Coated, Galvanized

Units under ASME B16.9 shall be stated in both SI (Metric) and U.S. Customary units. Designation for size is NPS

Chemical of Material UNS 31803

UNS S31803 is a key alloy in the growing steel industry. It is composed of 22% chromium, 3% molybdenum, 5-6.5% nickel, and trace amounts of other elements such as manganese, nitrogen, phosphorus, silicon, and sulfuric acid,details as below:

Material Standard of Stainless Steel

Stainless steel tee are commonly used in oils&gas and chemical&food industries. It’s have stronger advantage to suitable for plentiful working environments and good corrosion resistance.

Butt Weld Tee Standards:

For seamless & welded Austenitic stainless steel Tee pipe fittings:

Standard: ASTM A403

Grades: WP 304/304L/304H/316/316L/317/310S/321/347/904L/F53/UNS 31803 ect.

How to make UNS S31803 Butt Weld Tee

The common manufacturing process to make tees are cold extrusion and hot pushing. Cold extrusion normally for smaller thickness tee, where hot pushing is for large thickness. In case you need an big diameter tee above 24”, welding shall be adopted instead extrusion.

The key process to manufacture steel tee is to use the hydraulic machine to squeeze the mother pipe in a tee mould (or a reducing tee mould), under the big pressure on both pipe ends, the third branch of the tee will be extruded out.

For apply for plentiful projects and fields as for material of stainless steel are used much often such as 304L,316L,UNS 31803 and F51.The mother pipe could be a seamless or a welded pipe, the same pipe diameter will produce the same diameter tee, means to make a 8 inch steel tee will need a 8 inch pipe. But after the extrusion, the pipe thickness will be become larger, so the tee thickness is larger than the mother pipe thickness.