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akash.t
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Join Date: Jul 2019
Posts: 25

Percent Elongation Calculation as per ASME sec-viii div-1

07/06/2019 3:00 AM

Actually i was design the cylindrical vertical leg supported pressure vessel, the problem comes while cal. percent elongation of conical section. the dimensional features as

ID of large end-334 mm

ID of smaller end-100 mm

nominal thk-8 mm

pv elite result show % elongation 7.33%

my question was which diameter to be considered for Rf radius , so i will get 7.33% value.

thanx.
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Codemaster
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Location: Stoke-on-Trent, UK
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#1

Re: percent elongation calculation as per asme sec-viii div-1

07/06/2019 9:07 AM

There's something wrong here. If it's steel, strain 7.3% is well above the elastic limit. With E about 200000MPa, stress would be over 14000MPa, vs typical design stress for carbon steel ~ 200MPa.

In a cone, the stress, and hence strain, is highest at the greatest diameter.

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akash.t
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Join Date: Jul 2019
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#2
In reply to #1

Re: percent elongation calculation as per asme sec-viii div-1

07/11/2019 3:07 AM

But, if we consider large diameter ans will become 1.19% by ASME Sec-viii div-1,

(50*tn/Rf)*(1-Rf/Ro) then why pv elite show 7.3% ?
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Codemaster
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#3
In reply to #2

Re: percent elongation calculation as per asme sec-viii div-1

07/11/2019 4:19 AM

I haven't got ASME 8 with me, so can't comment on that formula, but there's still something wrong. Stress and strain are higher at larger dia (for a given pressure and thickness). Typical strain is in order of 0.1% for a steel vessel.

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akash.t
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#4
In reply to #3

Re: percent elongation calculation as per asme sec-viii div-1

07/11/2019 5:28 AM

Thanx sir.
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