Definition and details of Butt Weld Fittings
Tapgroup.com.vn - Straight Tee and Reducing Tee
The primary purpose of a Tee is to make a 90° branch from the main run of pipe. Standard there are 2 possibilities, on behalf of the equal tee and reducing tee. The equal tee (or straight tee) is used as the branch has the same diameter as the run-pipe. The reducing tee is used as the branch has a smaller diameter as the run-pipe.
Dimensions and Standards
When we talk about a tee NPS 3, a equal or straight tee is intended. With a tee NPS 3 x 2 a reducing tee is intended. Although, officially a reducing tee will be indicated by 3 diameters, namely 3 x 3 x 2 (A x B x C). The A & B measure stands for the Nominal Pipe Size of Run-Pipe, C measure stands for Nominal Pipe Size of Outlet.
This designation actually is superfluous, but comes from the time that tees were available in 3 different ends of diameters, such as
4 x 3 x 2 (A x B x C). In this implementation of course it is necessary, to specify 3 different sizes.
That kind of tees is probably no longer available. Applying a equal tee with a concentric or eccentric reducer is now the usual practice.
A straight or equal buttwelding Tee is available for all common diameters.
A Reducing Tee not, because many diameters are not produced, or can not be produced.
As an example: a reducing tee NPS 6 x 4 is a standard item for most suppliers, but a reducing tee NPS 16 x 2 is probably not available by any supplier.
It would also not economical to use a NPS 16 tee with a NPS 2 outlet; in such situations a Branch Fitting will be used or a Branch Connection will be made.
In addition to the defined tees, there are straight and reducing crosses.
Straight crosses are generally stock items, reducing crosses are often difficult to obtain.
I have never used that tees and I have they never seen in practice, at least not in petro and chemical industry. They will be used where space is limited, by revision work, in shipping industry et cetera.
Wall thickness Tee
By the shape of a tee, the wall thickness can be a critical item. ASME B16.9 only standardizes the end-to-end dimensions, center-to-end dimensions and some "squareness" dimensional tolerances.
The wall thickness at the weld line location even is standardized, but not through the rest of the fitting. The standard states that the minimum tolerance will be within 12.5% of the minimum ordered wall thickness of the pipe. A maximum tolerance is specified only at the ends of the fitting.
Many providers of welding tees (and elbows) provide one schedule greater thickness so that sufficient wall thickness, after forming, remains. In Tee's, the crotch radius (T) varies from one manufacturer to another, but some establish itself as a requirement, 1.3 times the wall thickness to maintain the crotch.
ASME B16.9-2003 Section 2.2 Design of fittings says:
...it is expected that some portion of formed fittings may have to be thicker than the pipe wall with which the fitting is intended to be used
Because there is no maximum tolerance for some parts of the fitting, the customer itself must indicate his requirements. Depending on a customer specification, the manufacturer must certify that the manufactured tee, is made the requested requirements.
He can do that with additional drawings, with additional wall thickness measurements etc. verified by an independent party or a customers inspector.
All these additional tests cost money, so it can happen, that the additional costs, many times higher, as the tee itself.
Description, Reducing Tee, ASTM A234 WPB (SA234 WPB) |
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Reducing Tee A234 Gr.WPB, SCH5 |
Reducing Tee A234 Gr.WPB, SCH20 |
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Reducing Tee A234 Gr.WPB, SCH40 |
Reducing Tee A234 Gr.WPB, SCH STD |
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Reducing Tee A234 Gr.WPB, SCH80 |
Reducing Tee A234 Gr.WPB, SCH120 |
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Reducing Tee A234 Gr.WPB, SCH160 |
Reducing Tee SA234 Gr.WPB, SCH160 |
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Reducing Tee SA234 Gr.WPB, SCH5 |
Reducing Tee SA234 Gr.WPB, SCH20 |
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Reducing Tee SA234 Gr.WPB, SCH40 |
Reducing Tee SA234 Gr.WPB, SCH STD |
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Reducing Tee SA234 Gr.WPB, SCH80 |
Reducing Tee SA234 Gr.WPB, SCH120 |
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Reducing Tee A234 Gr.WPB, SCH10 |
Reducing Tee A234 Gr.WPB, SCH30 |
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Reducing Tee A234 Gr.WPB, SCH60 |
Reducing Tee A234 Gr.WPB, SCHXS |
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Reducing Tee A234 Gr.WPB, SCH100 |
Reducing Tee A234 Gr.WPB, SCH140 |
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Reducing Tee A234 Gr.WPB, SCHXXS |
Reducing Tee SA234 Gr.WPB, SCHXXS |
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Reducing Tee SA234 Gr.WPB, SCH10 |
Reducing Tee SA234 Gr.WPB, SCH30 |
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Reducing Tee SA234 Gr.WPB, SCH60 |
Reducing Tee SA234 Gr.WPB, SCHXS |
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Reducing Tee SA234 Gr.WPB, SCH100 |
Reducing Tee SA234 Gr.WPB, SCH140 |
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Reducing Tee SA234 Gr.WPB SMLS, SCH5 |
Reducing Tee SA234 Gr.WPB SMLS, SCH10 |
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Reducing Tee SA234 Gr.WPB SMLS, SCH40 |
Reducing Tee SA234 Gr.WPB SMLS, SCH60 |
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Reducing Tee SA234 Gr.WPB SMLS, SCH80 |
Reducing Tee SA234 Gr.WPB SMLS, SCH100 |
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Reducing Tee SA234 Gr.WPB SMLS, SCH160 |
Reducing Tee SA234 Gr.WPB SMLS, SCHXXS |
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Reducing Tee SA234 Gr.WPB SMLS, SCH20 |
Reducing Tee SA234 Gr.WPB SMLS, SCH30 |
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Reducing Tee SA234 Gr.WPB SMLS, SCH STD |
Reducing Tee SA234 Gr.WPB SMLS, SCHXS |
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Reducing Tee SA234 Gr.WPB SMLS, SCH120 |
Reducing Tee SA234 Gr.WPB SMLS, SCH140 |
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Reducing Tee SA234 Gr.WPB Seamless, SCH5 |
Reducing Tee SA234 Gr.WPB Seamless, SCH10 |
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Reducing Tee SA234 Gr.WPB Seamless, SCH40 |
Reducing Tee SA234 Gr.WPB Seamless, SCH60 |
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Reducing Tee SA234 Gr.WPB Seamless, SCH80 |
Reducing Tee SA234 Gr.WPB Seamless, SCH100 |
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Reducing Tee SA234 Gr.WPB Seamless, SCH160 |
Reducing Tee SA234 Gr.WPB Seamless, SCHXXS |
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Reducing Tee SA234 Gr.WPB Seamless, SCH20 |
Reducing Tee SA234 Gr.WPB Seamless, SCH30 |
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Reducing Tee SA234 Gr.WPB Seamless, SCH STD |
Reducing Tee SA234 Gr.WPB Seamless, SCHXS |
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Reducing Tee SA234 Gr.WPB Seamless, SCH120 |
Reducing Tee SA234 Gr.WPB Seamless, SCH140 |
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Reducing Tee A234 Gr.WPB SMLS, SCH5 |
Reducing Tee A234 Gr.WPB SMLS, SCH10 |
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Reducing Tee A234 Gr.WPB SMLS, SCH40 |
Reducing Tee A234 Gr.WPB SMLS, SCH60 |
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Reducing Tee A234 Gr.WPB SMLS, SCH80 |
Reducing Tee A234 Gr.WPB SMLS, SCH100 |
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Reducing Tee A234 Gr.WPB SMLS, SCH160 |
Reducing Tee A234 Gr.WPB SMLS, SCHXXS |
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Reducing Tee A234 Gr.WPB SMLS, SCH20 |
Reducing Tee A234 Gr.WPB SMLS, SCH30 |
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Reducing Tee A234 Gr.WPB SMLS, SCH STD |
Reducing Tee A234 Gr.WPB SMLS, SCHXS |
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Reducing Tee A234 Gr.WPB SMLS, SCH120 |
Reducing Tee A234 Gr.WPB SMLS, SCH140 |
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Reducing Tee A234 Gr.WPB Seamless, SCH5 |
Reducing Tee A234 Gr.WPB Seamless, SCH10 |
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Reducing Tee A234 Gr.WPB Seamless, SCH40 |
Reducing Tee A234 Gr.WPB Seamless, SCH60 |
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Reducing Tee A234 Gr.WPB Seamless, SCH80 |
Reducing Tee A234 Gr.WPB Seamless, SCH100 |
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Reducing Tee A234 Gr.WPB Seamless, SCH160 |
Reducing Tee A234 Gr.WPB Seamless, SCHXXS |
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Reducing Tee A234 Gr.WPB Seamless, SCH20 |
Reducing Tee A234 Gr.WPB Seamless, SCH30 |
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Reducing Tee A234 Gr.WPB Seamless, SCH STD |
Reducing Tee A234 Gr.WPB Seamless, SCHXS |
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Reducing Tee A234 Gr.WPB Seamless, SCH120 |
Reducing Tee A234 Gr.WPB Seamless, SCH140 |
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Straight Tee, A234 WPB |
Reducing Tee, A234 WPB |
Equa Tee, A234 WPB |
SMLS A234 WPB, Straight Tee |
Straight Tee, SA234 WPB |
Reducing Tee, SA234 WPB |
Equa Tee, A234 WPB, Zinc plating |
Seamless A234 WPB, Straight Tee |
Reducing Tee, A234 WPB, |
Reducing Tee, SA234 WPB, |
Reducing Tee, ASTM234 WPB, Hot dipped galvanized |
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Tee, A234 WPB, Hot dipped galvanized |
Tee, SA234 WPB Hot dipped galvanized |
Tee, SA234 WPB, Galvanized |
Reducing Tee, A234 WPB, |
Straight Tee, A234 WPB, |
Straight Tee, A234 WPB, Galvanized |
Tee, A234 WPB, Oil Coating |
Tee, SA234 WPB, |
Tee, A234 WPB, black paint |
Reducing Tee, A234 WPB, Seamless |
Reducing Tee, A234 WPB, SMLS |
ASTM A234 WPB, Tee |
Coating Tee, ASTM A234 WPB (SA234 WPB) |
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Hot dip galvanized |
Mạ kẽm nhúng nóng |
Galvanized |
ECTFE Coatings |
PTFE Coating |
PFA Coating |
FEP Coating |
ECTFE Lining |
PTFE Lining |
PTFE Polytetrafluoroethylene (PTFE) |
PFA Lining |
FEP Lining |
PVDF Lining |
PTFE MS Lined Pipes and Fittings |
Black Coated |
FBE Fusion Bonded Epoxy |
FBE External Tape |
FBE Internal Coating |
2 Layer FBE + Rough Coating |
Double Layer FBE |
Dual Coat FBE Capabilities |
Fusion Bonded Epoxy (FBE) Coating |
Ceramic Epoxy Lining |
Superior External Coating |
Fusion Bond Epoxy Coatings |
3PE Epoxy coating |
Fusion Bond Epoxy (FBE) |
Ceramic Epoxy |
PROTECTIVE FUSION |
CERAMIC EPOXY LINED |
3LPE THREE-LAYER |
3LPP THREE-LAYER |
Ceramic-Lined Pipe and Fittings |
Epoxy powder coating |
polyethylene-lined |
polyethylene lining |
Small-Diameter Single-Layer Bonded Polyethylene-Coated |
PLP-P1H (Single-Layer Bonded Polyethylene-Coated) |
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PLP-P2S (Polyethylene-Coated) |
JDLP (PVC-Lined Steel) |
Plastic-Lined |
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PFA Lining |
Epoxy coating |
Coating FBE epoxy powder coating |
Epoxy PE Coating |
with epoxy liquid coating meeting |
Fusion Bond Epoxy Coated |
Epoxy color coated |
Polyethylene Coated |
Hot-dipped Galvanized or Epoxy Coating |
Plastic PE Coated |
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Pressure Rating : Schedule, ReducingTee, ASTM A234 WPB (SA234 WPB) |
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SCH5 |
SCH10 |
SCH20 |
SCH30 |
SCH STD |
SCH40 |
SCH60 |
SCHXS |
SCH80 |
SCH100 |
SCHXS |
SCH120 |
SCH120 |
SCH160 |
SCH XXS |
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Standard, Reducing Tee, ASTM A234 WPB (SA234 WPB) |
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ASME B16.9, Factory-Made Wrought |
ANSI B16.9, Factory-Made Wrought |
ASME B16.25 Buttwelding End |
ANSI B16.25 Buttwelding End |
ASME B16.28, Wrought |
MSS SP-43, Wrought and Fabricated Butt - weld fittings For Low |
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API 590 |
API 605 |
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DIN2605 |
DIN2615 |
DIN2616 |
DIN2617 |
DIN28011 |
EN10253-1 |
EN10253-2 |
EN 10253-3 EN 10253-4 |
DIN 2605-1 |
DIN 2609 |
DIN 2605-2 |
DIN 2616-2 |
DIN 2616-1 |
DIN 2615-1 |
DIN 2615-2 |
DIN 2616-2 |
DIN 28011 |
DIN 2617 |
EN 10204 3.1 |
EN 10253-2 |
KS B 1522 Steel Butt Welding Pipe |
KS B 1541 Steel Butt Welding |
KS B 1543 Steel Plate |
JIS B 2311 Steel Butt Welding Pipe |
JIS B 2312 Steel Butt Welding |
JIS B 2313 Steel Plate Butt Welding |
ASME B31.1 Power piping |
ASME B31.3 Process piping. |
ASME SECTION II, Materials |
ASME SECTION, III |
ASME SECTION, V |
ASME SECTION, VIII |
DIN 2605 - 2606 - 2615 - 2616 - 2617 - BS 1640 - |
17378 - 17379 - 17380 |
MSS SP-43 |
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ASME B31.1 - ASME B31.3 - ASME B31.4 - ASME B31.8 |
EN 13445 - 13480 - 12952 (Former BS PD 5500 - Swedish |
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Material, ReducingTee |
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Class |
Construction |
Non-destructive Examination |
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SMLS |
Seamless |
None |
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W |
Welded |
Radiography or Ultrasonic |
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WX |
Welded |
Radiography |
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WU |
Welded |
Welded Ultrasonic |
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ASTM A234 Gr. WPA |
ASTM A234 Gr. WP1 |
ASTM A234 Gr. WP22 |
ASTM A420 Gr. WPL3 |
ASTM A234 Gr. WPC |
ASTM A234 Gr. WP5 |
ASTM A234 Gr. WP23 |
ASTM A420 Gr. WPL6 |
ASTM A234 Gr.WPB |
ASTM A234 Gr. WP9 |
ASTM A234 Gr. WP91 |
ASTM A420 Gr. WPL9 |
ASTM A234 Gr.WP12 |
ASTM A234 Gr. WP11 |
ASTM A234 Gr. WP92 |
ASTM A234 Gr. WPR |
ASTM A234 Gr. WP11, CL1 |
ASTM A234 Gr.WP12, CL1 |
ASTM A234 Gr. WP22, CL1 |
ASTM A234 Gr. WP5, CL1 |
ASTM A234 Gr. WP11, CL2 |
ASTM A234 Gr.WP12, CL2 |
ASTM A234 Gr. WP22, CL3 |
ASTM A234 Gr. WP5, CL3 |
ASTM A234 Gr. WP11, CL3 |
ASTM A234 Gr.WP12, CL3 |
ASTM A234 Gr. WP9, CL1 |
ASTM A234 Gr. WP9, CL3 |
ASTM A403 Gr.WP304 |
ASTM A403 Gr.WP304L |
ASTM A403 Gr.WP316 |
ASTM A403 Gr.WP316L |
ASTM A403 Gr.WP304H |
ASTM A403 Gr.WP304N |
ASTM A403 Gr.WP304LN |
ASTM A403 Gr.WPN |
ASTM A403 Gr.WP316H |
ASTM A403 Gr.WP316N |
ASTM A403 Gr.WP316LN |
ASTM A403 Gr. WP317 |
ASTM A403 Gr. WP317L |
ASTM A403 Gr. XM-19 |
ASTM A403 Gr. WP309 |
ASTM A403 Gr. WP310S |
ASTM A403 Gr.S31254 |
ASTM A403 Gr. WP31725 |
ASTM A403 Gr. WP31726 |
ASTM A403 Gr. WP31727 |
ASTM A403 Gr. WP32053 |
ASTM A403 Gr. WP321 |
ASTM A403 Gr. WP321H |
ASTM A403 Gr.WPS33228 |
ASTM A403 Gr.WPS34565 |
ASTM A403 Gr.WP347 |
ASTM A403 Gr.WP347H |
ASTM A403 Gr.WP348 |