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STRESS ANALYSIS OF PIPING SYSTEMS B.123
FIGURE B4.5c Flexibility and stress intensification factors (Do /t n ≤ 100). (Figure NC-3673.2(b)-1, Section III, Division 1, ASME B & PV Code, 1998. Courtesy of ASME.)
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STRESS ANALYSIS OF PIPING SYSTEMS
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GENERIC DESIGN CONSIDERATIONSB.124
configurations. If the half-coupling rating is not known, assume a Class 3000half-coupling, since this will give the more conservative value.
c.Sweepolets. For branch:
(B4.17)
FIGURE B4.5c (Continued ) Flexibility and stress intensification factors (Do /t n ≤ 100). (FigureNC-3673.2(b)-1, Section III, Division 1, ASME B & PV Code, 1998. Courtesy of ASME.)
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STRESS ANALYSIS OF PIPING SYSTEMS
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STRESS ANALYSIS OF PIPING SYSTEMS B.125
For run:
(B4.18)
(B4.19)
where F 1 = F 2 = 1.0 for flush or dressed insert welds= 1.6 for as-welded insert weldsF 2 = (0.5 + r/R) , but not less than 1.0 for as-welded insert weldsF s = 1 + 0.05(r - 3), but not less than 1.0R = mean radius of run pipe, in
FIGURE B4.5c (Continued ) Flexibility and stress intensification factors (Do /t n ≤ 100). (FigureNC-3673.2(b)-1, Section III, Division 1, ASME B & PV Code, 1998. Courtesy of ASME.)
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GENERIC DESIGN CONSIDERATIONSB.126
1 in = 25.4 mm
r = mean radius of branch pipe, inT = nominal wall thickness of run pipe, int = nominal wall thickness of branch pipe, in
If a more detailed analysis is desirable, see Ref. 5 for the equations to beused for moment separation.
d. Lateral branch connections (45°).6,7 For rb /r > 0.5,
(B4.20)
1 in = 25.4 mm
TABLE B4.3a SIFs for Typical Weldolet Branch Connections (Run PipeSize: NPS 1½ or DN 40)
TABLE B4.3b SIFs for Typical Weldolet Branch Connections (Run PipeSize: NPS 2 or DN 50)
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B.127
T A B L E
B 4 . 3
c
S I F s f o
r T y p i c a
l W e l d o l e t B r a n c h C o n n e c t i o n s
( R u n P i p e S i z e : N P S 2 ½ ( D N 6
5 ) a n d N P S 3 ( D N 8 0 )
1 i n = 2 5 . 4 m m
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STRESS ANALYSIS OF PIPING SYSTEMS
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