Buttwelding Elbows and Returns

Source of Data

All buttweld elbows and returns dimensions are as per ASME B16.9 : Factory Made Wrought Buttwelding Fittings

Dimension Terms

• A : Center End 90 Degree Elbows
• B : Center to End 45 Degree Elbows
• OD : Outside Diameter
• O : Center to Center

GENERAL NOTE:

All dimensions are in Millimeters or Inches as selected.

NOTES:

(1) For 180 Degree Returns, dimension A is equal to one-half of dimension O

(2) See Table 13 of this standard for tolerance for alignment of ends U of 180 degree returns.

Buttwelding Caps

Source of Data

Buttweld Cap Dimensions are as per Table 10 of ASME B16.9 : Factory Made Wrought Buttwelding Fittings

Dimension Terms

• OD : Cap Face Outside Diameter
• E : Cap Length (Note 1)
• E1 : Cap length if wall thickness exceeds Limiting Wall Thickness

General Notes

(a). All dimensions are in millimeters and inches as selected.

(b). The shape of these caps shall be ellipsoidal and shall conform to the requirements given in the ASME Boiler and Pressure Vessel Code.

NOTES:

(1) Length E applies for thickness not exceeding that given in column “Limiting Wall Thickness for Lenght, E.”

(2) Length E1 applies for thickness greater than that given in column “Limiting Wall Thickness” for NPS 24 and smaller. For NPS 26 and larger, length E1 shall be by agreement between the manufacturer and purchaser.

Buttwelding Reducers

Source of Data

Buttweld Reducer Dimensions are as per Table 11 of ASME B16.9 : Factory Made Wrought Buttwelding Fittings

Dimension Terms

• OD : Outlet Diameter at Bevel
• H : End to End

General Notes

(a) All dimensions are in millimeters and inches as selected.

(b) While the figure illustrates a bell-shaped reducer, the use of a conical reducer is not prohibited.

Buttwelding Reducing Tees and Crosses

Source of Data

Buttweld Reducing Tees and Crosses Dimensions are as per Table 8 of ASME B16.9 : Factory Made Wrought Buttwelding Fittings

Dimension Terms

• OD : Outlet Diameter at Bevel
• C : Center to End Dimension of Run
• M : Center to End Dimension of Outlet

General Notes

All dimensions are in millimeters and inches as selected.

NOTES:

(1) Outlet dimension M for run sizes NPS 14 and larger is recommended but not required.

Buttwelding Straight Tees and Crosses

Source of Data

Buttweld Straight Tees and Crosses Dimensions are as per Table 7 of ASME B16.9 : Factory Made Wrought Buttwelding Fittings

Dimension Terms

• OD : Outlet Diameter at Bevel
• C : Center to End Dimension of Run
• M : Center to End Dimension of Outlet : Notes 1 and 2

General Notes

All dimensions are in millimeters and inches as selected.

NOTES:

(1) Outlet dimension M for NPS 26 and larger is recommended but not required.

(2) Dimensions applicable to crosses NPS 24 and smaller.

Lap Joint Stub Ends

Source of Data

Lap Joint Stub End Dimensions are as per Table 9 of ASME B16.9 : Factory Made Wrought Buttwelding Fittings

Dimension Terms

• F : Length of Stub End : Notes 3 and 4
• G : Diameter of Lap : Note 6
• R : Radius of Fillet : Note 5
• T : Lap Thickness : Note 2

General Notes

(a) All dimensions are in millimeters and inches as selected.

(b) See Table 13 of this standard for Tolerences.

(c) Service conditions and joint construction often dictate stub end lengh requirements. Therefore, the purchaser must specify long or short pattern fitting when ordering.

NOTES:

(1) Gasket face finish shall be in accordance with ASME B16.5 for raised face flanges.

(2) The lap thickness T shall not be less than nominal pipe wall thickness. See Table 13 of ASME B16.9 for maximum tolerance.

(3) When short pattern stub ends are used with larger flanges in Classes 300 and 600, with most sizes in Classes 900 and higher, and when long pattern stub ends are used with larger flanges in Classes 1500 and 2500, it may be necessary to increase the length of stub ends in order to avoid covering the weld with the flange. Such increases in length shall be matter of agreement between the manufacturer and purchaser.

(4) When special facings such as tongue and groove, male and female, etc. are employed, additional lap thickness must be provided and such additional thickness shall be in addition to (not include in ) the basic length F.

(5) These dimenions conform to the radius established for lap joint flanges in ASME B16.5

(6) This dimension conforms to standard machined facings shown in AMSE B16.5. The back face of the lap shall be machined to conform to the surface on which it seats. Where ring joint facings are to be applied, use dimenion K as given in ASME 16.5