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TitleTrunnion Calculation Sheet[1]
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Page 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

Page 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

2

f
F L
rc
c

2

f
F

ra
a

2

f f a l2 1 5. 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

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