ASME BPVC 2023 Section II part A-2

SA-587 ASME BPVC.II.A-2023
1034
6.2 Flattening Test:
6.2.1 Asection of pipe not less than 4 in. 102 mm in length
shall be flattened cold between parallel plates in two steps. The
weld shall be placed 90° from the direction of the applied
force. During the first step, which is a test for ductility, no
cracks or breaks, except as provided for in 6.2.5, shall occur on
the inside or outside surfaces until the distance between the
plates is less than the value of H, calculated by the following
equation:
H 5 @~11et/@e1t/D 1
where:
H = distance between flattening plates, in.,
t = specified wall thickness of the pipe, in.,
D = specified outside diameter of the pipe, in., and
e = deformation per unit length 0.09 for low-carbon steel.
6.2.2 During the second step, which is a test for soundness,
the flattening shall be continued until the specimen breaks or
the opposite walls of the pipe meet. Evidence of laminated or
unsound material, or of incomplete weld that is revealed during
the entire flattening test shall be cause for rejection.
6.2.3 Surface imperfections in the test specimens before
flattening, but revealed during the first step of the flattening
test, shall be judged in accordance with the finish requirements.
6.2.4 Superficial ruptures resulting from surface imperfections
shall not be cause for rejection.
6.2.5 When low D-to- t ratio tubulars are tested, because the
strain imposed due to geometry is unreasonably high on the
inside surface at the 6 and 12 oclock locations, cracks at these
locations shall not be cause for rejection if the D-to-t ratio is
less than 10.
6.3 Reverse Flattening TestA section 4 in. 102 mm in
length of pipe in sizes down to and including 1316 in. 20.6 mm
in outside diameter shall be split longitudinally 90° on each
side of the weld and the sample opened and flattened with the
weld at the point of maximum bend. There shall be no evidence
of cracks or lack of penetration or overlaps resulting from flash
removal in the weld.
6.4 Flange TestA section of pipe not less than 4 in. 102
mm in length shall be capable of having a flange turned over
at a right angle to the body of the pipe without cracking or
showing flaws. This flange, as measured from the outside of the
pipe, shall be not less than 18 in. 3.2 mm nor more than 12 in.
12.7 mm. Within these limits, the width of the flange shall be
not less than the percentages specified in Table 4.
7. Dimensions and Permissible Variations
7.1 Permissible Variations in Outside Diameter and Wall
ThicknessThe outside diameter and wall thickness variations
shall not exceed the limits prescribed in Table 1.