ASME B16.49-2017 pdf free download.Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems
11.1.2 Fracture Toughness Testing. A set of three transverse Charpy V-notch impact specimens shall be taken from the tangent, the transition zones, and the bend at both the intrados and extrados for each lot of material. See Figure 2 or Figure 3 for locations. If the tangents and/or transition zones are not left integral to the bend, no impact tests are required except on the bend. See Figure 2 or Figure 3.
11.1.3 Weld Testing (a) Longitudinal Seams. The tensile, impact, and hard- ness tests shall be performed on the pipe orcylinder long- itudinal seam weld at the locations shown in Figure 2. Acceptance criteria shall be as specified in paras. 8.1, 8.2, 8.3, and 11.1.4. (b) Helical Seam. The tensile, impact, and hardness tests shall be performed on the pipe or cylinder helical seam at the locations shown in Figure 3. Acceptance criteria shall be as specified in paras. 8.1, 8.2, 8.3, and 11.1.4.
11.1.4 Hardness Testing. The bend shall be tested for average hardness in all the same locations as the tensile tests are taken as well as each transition zone. In addition, an average hardness reading shall be taken from a minimum of two locations in the bend at the extrados and intrados. The allowable difference between the minimumandmaximumhardnessreadingsforaquadrant around the circumference is 30 Brinell hardness number, orequivalent, ifanothertestingmethodis used. SeeFigure 2 or Figure 3.
11.2 Production Bend Requirements To demonstrate uniformity between the qualification and production bends, each production bend shall be hardness tested in all the same locations as the qualifica- tionbend. Inaddition,hardnessreadingsshallbetakenfor each additional 30 deg of arc beyond the qualification bend angle. All values within like quadrants around thecircumference shall be withinthe same range as deter- mined in para. 1
1.1.4. No readings shall exceed the maximum specified in Table 1, and no average shall equate to a tensile strength less than the minimum required in Table 1 for the specified grade.
11.3 Testing Results The bend shall be marked with the appropriate grade symbol ofTable 1 based on the testresults forall locations meeting the minimum values specified for that grade. If the bend strength is different from the mating pipe, and thesubstitutionofwall thickness foryield strengthis used in accordance with para. 8.1, both the bend grade and the intended mating pipe grade shall be marked on the bend (i.e., P414/X483).
12 DIMENSIONAL REQUIREMENTS The dimensional requirements in section 12 shall be met on each bend.
12.1 Ovality Ovality shall be measured throughout the bend and tangents. The difference between the maximum and minimum outside diameter shall not exceed 3% of the nominal mating pipe outside diameter within the bend and 1% at the welding end. The purchaser and manufacturer may agree to a different ovality tolerance (see para. SR15.3).
12.2 Outside Diameter The outside diameter of each welding end shall be within 1% of the nominal mating pipe outside diameter. The diameter throughout the bend and the remainder of the tangents need only meet the ovality tolerance, unless thepurchaserandmanufactureragreetoothertolerances.
12.3 Wall Thickness The wall thickness shall be checked in sufficient loca- tions throughout the bend to ensure that the minimum wall does not fall below 90% of the nominal mating wall thickness marked on the bend (or below the purchaser-specified minimum wall thickness). This belowtolerance allowance does not apply to those areas determined to need reinforcement as a result of design requirements of para. 2.2. Inspection shall be done using compression wave ultrasonic examination by calibrated equipment that meets a procedure devel- oped by the manufacturer to ensure accurate readings.
12.4 Inside Diameter
12.4.1 Welding Ends.ForNPS36(DN900) andsmaller, theinsidediametertoleranceatthebevelfaceshallbe±2.5 mm (±0.10 in.). For larger sizes, the inside diameter toler- ance shall be ±3 mm (±0.12 in.).
12.4.2 Body. Unless otherwise agreed to by the purchaser, the average internal diameter at any location in the bend shall not be less than 97% of the minimum specified mating pipe internal diameter. Proof of conformance to this requirement shall be demonstrated by passing a sphere or other suitable gaging device through the bend withoutassistance ofpowerequipment.
12.5 End Preparation Welding ends shall be beveled using ASME B16.25, Figure 2 illustration (a) or Figure 3 illustration (a) end preparations,unlessotherwisespecifiedbythepurchaser.ASME B16.49 pdf download.ASME B16.49-2017 pdf free download
