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Trunnion Calculation Sheet
PIPE SUPPORT No.
LINE NUMBER.
PIPE INPUT DATA:
Pipe Dia. mm = 600 Pipe radius (R) mm = 300
Pipe nom. thk (Tnom) mm = 12.7 Pipe tolerance (%) = 12.5
or Pipe tolerance (mm) =
Pipe min. thk (T) mm= 7.93
Trunnion Dia (d) mm = 355.6 Trunnion radius (r) mm = 177.8
Pad nom. thk (tpnom) mm = 0 Pad tolerance (%) = 12.5
or Pad tolerance (mm) =
Pad min. thk. (tp) mm = 0.00
Moment arm (L) mm = 613 Pipe corr. allw. (mm) = 3.18
Effective wall thickness for calculation
(tmin) mm = T + tp = 7.93
LOADING INPUT DATA:
Design press. (P), barg = 15.17
Direct axial load (Fa), N = 38500
Force producing longitudinal moment (Fl), N = 17000
Force producing circumferential moment (Fc), N = 7000
0 - Original Issue 6/28/2008
Rev Revisions Date Drawn Chkd Appd
Drg No. Trunnion calc Sheet 1 of 2
partrunn page 1 6/28/2008 7:20 PM
Trunnion Calculation Sheet
PIPE SUPPORT No. 0
CALCULATION: (USING KELLOGS METHOD)
Longitudinal linear load (fl), N/mm = 104.92
Circumferential linear load (fc), N/mm = 43.20
Direct axial lineal load (fa), N/mm = 34.46
Combined circ. load with out-plane factor (f1), N/mm f1=1.5(fa+fc) = 116.49
Combined long. load with out-plane factor (f2), N/mm = 156.60
Circumferential bending stress (Sbc), N/mm² = = 105.66
Longitudinal bending stress (Sbl), N/mm² = = 142.05
Hoop primary stress (Sph), N/mm² = Sph=P*R/(10*tmin) = 57.37
Longt. primary stress (Spl), N/mm² = Spl=P*R/(20*tmin) = 28.69
Combined circ. stress (Sc), N/mm² = Sbc + Sph = 163.03 109%
Combined long. stress (Sl), N/mm² = Sbl + Spl = 170.73 115%
Allow. stress (Sh), N/mm² = 99.29 1.5 · Sh (Sha), N/mm² = 148.94
Sc to be less than 1.5 · Sh
Sl to be less than 1.5 · Sh
RESULTS:
This calculation shows the trunnion to be: INADEQUATE
0 - Original Issue 6/28/2008
Rev Revisions Date Drawn Chkd Appd
Drg No. Trunnion calc Sheet 2 of 2
f
F L
rl
l
=
π 2
f
F L
rc
c
=
π 2
f
F
ra
a
=
2 π
( )f fa l2 15= +. f
S
f R
t
bc =
117 1
3
2
.
min
S
f R
t
bl =
117 2
3
2
.
min
partrunn page 2 6/28/2008 7:20 PM
partrunn page 3 6/28/2008 7:20 PM

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Trunnion calculation sheet

  • 1. Trunnion Calculation Sheet PIPE SUPPORT No. LINE NUMBER. PIPE INPUT DATA: Pipe Dia. mm = 600 Pipe radius (R) mm = 300 Pipe nom. thk (Tnom) mm = 12.7 Pipe tolerance (%) = 12.5 or Pipe tolerance (mm) = Pipe min. thk (T) mm= 7.93 Trunnion Dia (d) mm = 355.6 Trunnion radius (r) mm = 177.8 Pad nom. thk (tpnom) mm = 0 Pad tolerance (%) = 12.5 or Pad tolerance (mm) = Pad min. thk. (tp) mm = 0.00 Moment arm (L) mm = 613 Pipe corr. allw. (mm) = 3.18 Effective wall thickness for calculation (tmin) mm = T + tp = 7.93 LOADING INPUT DATA: Design press. (P), barg = 15.17 Direct axial load (Fa), N = 38500 Force producing longitudinal moment (Fl), N = 17000 Force producing circumferential moment (Fc), N = 7000 0 - Original Issue 6/28/2008 Rev Revisions Date Drawn Chkd Appd Drg No. Trunnion calc Sheet 1 of 2 partrunn page 1 6/28/2008 7:20 PM
  • 2. Trunnion Calculation Sheet PIPE SUPPORT No. 0 CALCULATION: (USING KELLOGS METHOD) Longitudinal linear load (fl), N/mm = 104.92 Circumferential linear load (fc), N/mm = 43.20 Direct axial lineal load (fa), N/mm = 34.46 Combined circ. load with out-plane factor (f1), N/mm f1=1.5(fa+fc) = 116.49 Combined long. load with out-plane factor (f2), N/mm = 156.60 Circumferential bending stress (Sbc), N/mm² = = 105.66 Longitudinal bending stress (Sbl), N/mm² = = 142.05 Hoop primary stress (Sph), N/mm² = Sph=P*R/(10*tmin) = 57.37 Longt. primary stress (Spl), N/mm² = Spl=P*R/(20*tmin) = 28.69 Combined circ. stress (Sc), N/mm² = Sbc + Sph = 163.03 109% Combined long. stress (Sl), N/mm² = Sbl + Spl = 170.73 115% Allow. stress (Sh), N/mm² = 99.29 1.5 · Sh (Sha), N/mm² = 148.94 Sc to be less than 1.5 · Sh Sl to be less than 1.5 · Sh RESULTS: This calculation shows the trunnion to be: INADEQUATE 0 - Original Issue 6/28/2008 Rev Revisions Date Drawn Chkd Appd Drg No. Trunnion calc Sheet 2 of 2 f F L rl l = π 2 f F L rc c = π 2 f F ra a = 2 π ( )f fa l2 15= +. f S f R t bc = 117 1 3 2 . min S f R t bl = 117 2 3 2 . min partrunn page 2 6/28/2008 7:20 PM
  • 3. partrunn page 3 6/28/2008 7:20 PM