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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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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   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