The vessel given in Example 16.3 is to be constructed from SA-516 Grade 60 material and designed for 475 psi at 650°F. The weld joint efficiency is E = 1.0. What are the total longitudinal stresses on both the windward and leeward sides at the support line? What are the allowable tensile and

Question

The vessel given in Example 16.3 is to be constructed from SA-516 Grade 60 material and designed for 475 psi at 650°F. The weld joint efficiency is E = 1.0. What are the total longitudinal stresses on both the windward and leeward sides at the support line? What are the allowable tensile and compressive stresses?

Accepted Answer

From Table UCS-23 of the ASME Code, VII-1, for SA-516 Grade 60 at 650°F, the allowable tensile stress is [latex]S_{t}=15,000[/latex] psi. The weight of the shell and upper head above the support line is determined from Example 16.5 as

W = 65,210 + 0.5(3320) = 66,870 lb

The overturning moment due to the wind loading at the support line is determined from Example 16.2 as

[latex]M_{ o }=(862,570)(12)=10,350,840 ext { in.- lb}[/latex]

Determine the total longitudinal stress [latex]\sigma_{L}[/latex] using Eq. 16.21 as follows:

[latex]\sigma_{L}=+P\left(\frac{R}{2 t}-0.2 ight) \pm \frac{W}{\pi D_{m} t} \pm \frac{4 M_{e}}{\pi D_{m}^{2} t}[/latex] (16.21)

[latex]\sigma_{L}=+(475)\left(\frac{30}{2 imes 1}-0.2 ight) \pm \frac{(66,870)}{\pi(61)(1)} \pm \frac{4(10,350,840)}{\pi(61)^{2}(1)}[/latex]

[latex]\sigma_{L}=+(7030) \pm(350) \pm(3540)[/latex]

Windward Side Stresses

1 . Pressure, dead load, wind load = +(7030) - (350) + (3540) = 10,220 psi tension

2 . No pressure, dead load, wind load = 0 - (350) + (3540) = 3190 psi tension

3 . Dead load only = 350 psi compression

Leeward Side Stresses

1 . With internal pressure, dead load and wind load, = +(7030) - (350) - (3540) = 3140 psi tension

2 . With no internal pressure, with dead load, and wind load = 0 - (350) - (3540) = 3890 psi compression

Allowable Stress-Tension

[latex]S_{t}[/latex] = 15,000 psi for SA-516 Grade 60 at 650°F

Allowable Stress-Compression

[latex]A=\frac{0.125}{R_{o} / t}=\frac{0.125}{(31 / 1)}=0.0040[/latex]

and from Fig. 8.11 and also Fig. 5-UCS-28.2 of the ASME Code, VIII-1, the value of B is 11,500 . This gives an allowable stress of [latex]S_{c}=11,500[/latex] psi. All calculated stresses are less than the allowable stresses.

Question 16.9: The vessel given in Example 16.3 is to be constructed from S...

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