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akash.t
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Pressure Vessels Support Design

01/22/2020 7:16 AM

How to derive moment of inertia of bolts about vessel neutral axis? As per jawad & farr book they have given nar^2/2. Can anyone please explain explain the same?
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SolarEagle
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#1

Re: Pressure Vessels Support Design

01/22/2020 5:44 PM

https://books.google.com/books?id=dSJgDwAAQBAJ&pg=PA235&lpg=PA235&dq=moment+of+inertia+of+bolts+about+vessel+neutral+axis&source=bl&ots=FIeKBpOTH6&sig=ACfU3U1ZuBGARSnMirZghv0y7IPdtmAAng&hl=en&sa=X&ved=2ahUKEwjf8NHoo5jnAhUrUt8KHUj7AWUQ6AEwAnoECAkQAQ#v=onepage&q=moment%20of%20inertia%20of%20bolts%20about%20vessel%20neutral%20axis&f=false

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MR. Guest
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#4
In reply to #1

Re: Pressure Vessels Support Design

01/23/2020 12:00 PM

It would be better to revise the phrasing the definition of:

''W = weight of the vessel''

to:

''W = Total weight of the sum of the fully loaded vessel plus any Wind, Snow, Seismic, Impact, and all other applicable, and contributing, loads, with vertical, and/or horizontal, and/or cyclic, and/or other, contributing components.''

(and that total weight may also need to be facotored upwards, in order to account for age, fatigue, chemical, etc., influences, as well)

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Tornado
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#2

Re: Pressure Vessels Support Design

01/23/2020 12:48 AM

If the axis for calculating the MOI were the longitudinal axis of the vessel (as would be suitable for certain instances), then the MOI would be NAR2, by simple definition of MOI. However, for bending of the whole assembly, the relevant axis is perpendicular to the vessel axis. The bolts are not all equidistant from this second axis. When summed, their total MOI comes to NAR2/2.

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akash.t
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#3
In reply to #2

Re: Pressure Vessels Support Design

01/23/2020 6:28 AM

Please reply your ans in mathematical format, bcs am not able to understand you
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PWSlack
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#5
In reply to #3

Re: Pressure Vessels Support Design

01/24/2020 4:01 AM

Undefined: <...ans...bcs...>

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akash.t
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#6
In reply to #5

Re: Pressure Vessels Support Design

01/24/2020 5:04 AM

WHY? INDEFINITE ANSWER IS ?
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PWSlack
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#8
In reply to #6

Re: Pressure Vessels Support Design

01/28/2020 7:15 AM

Please stop SHOUTING. People here are trying to get some sleep...

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akash.t
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#9
In reply to #8

Re: Pressure Vessels Support Design

01/29/2020 11:37 PM

If you don't know ans please don't reply, and don't try to use such language this is not your home to reply like that, before going to ans first think. how much knowledge you have.
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MR. Guest
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#7
In reply to #3

Re: Pressure Vessels Support Design

01/24/2020 12:10 PM

W = Wdesign = [ K ( P ( age+fatigue+chemical+other loads ) ) ] x [Wtank+Wcontents+W( wind+snow+seismic+impact+other weights ) ]

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#10
In reply to #3

Re: Pressure Vessels Support Design

01/30/2020 1:50 AM

That was mathematical. I doubt there is a much simpler way to say it.

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