I have seen that g's and m/s2 get mixed up: 10 m/s2 is roughly 1g.
Also:
You could do a quick and dirty feasability check and bound the problem: the
resulting acceleration of the fluid must be between 5 and 10 g (m/s2).
This should give you an idea if the tank and its anchoring stand a chance of
taking the specified loads,
good luck
Theo Schotten
> Thanks Theo
>
> I'll do a search for the USAEC stuff, and get back to you if I luck out.
> In this case I think the high acceleration may be due to the criticality
> of the service; expect the power pack is required to operate in order to
> make things safe during/after an earthquake.
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: <a href="/group/PipingDesign/post?postID=YI-d8c3S34D23r3In00JxXE4QGqSMoAW7HSCs05Z7BFU4r_kM5Vwv6bqS-CIG4j-Eqj2MRLL24Od1bLUw9lSmQm1WcoY">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=YI-d8c3S34D23r3In00JxXE4QGqSMoAW7HSCs05Z7BFU4r_kM5Vwv6bqS-CIG4j-Eqj2MRLL24Od1bLUw9lSmQm1WcoY">PipingDesign@yahoogroups.com</a>]
> On Behalf Of Theo Schotten
> Sent: Tuesday, October 04, 2005 4:11 AM
> To: <a href="/group/PipingDesign/post?postID=YI-d8c3S34D23r3In00JxXE4QGqSMoAW7HSCs05Z7BFU4r_kM5Vwv6bqS-CIG4j-Eqj2MRLL24Od1bLUw9lSmQm1WcoY">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] Seismic response of hydraulic oil tank
>
>
> Steve
>
> I have used the following document occasionally for this problem:
>
> U.S. Atomic Energy Commission "Nuclear reactors and earthquakes",
> TID-7024
> Appendix F "Dynamic analysis of Fluids in Containers subjected to
> accelerations", Washington DC, 1963
>
> Since 1963 there have been many papers on this topic published, most of
> them
> not easy to digest. I use the above because the USEAC gives it some
> authority. It should be in the public domain. I have a copy if required.
> I think nowadays many people use CFD for this problem. If you are
> interested I can give you the details of some papers on this
> topic.
>
> 10 g at a period between 0.15 and 0.2 seconds seems very high to me. Is
> the
> equipment located high in a building'
>
> Theo Schotten
>
> ----- Original Message -----
> From: "Steve McKenzie" <Mechproj@xtra.co.nz>
> To: <PipingDesign@yahoogroups.com>
> Sent: Monday, October 03, 2005 11:34 AM
> Subject: [PipingDesign] Seismic response of hydraulic oil tank
>
>
>> Gents
>>
>> have been asked to have a look at a couple of hydraulic/lube oil power
>
>> pack tanks, from a seismic perspective. The larger has a volume of
>> around 2.65m^3 The nominated ground acceleration is 10g if the natural
>
>> frequency is within 0.15-0.2 seconds; otherwise 5g. Maximum ground
>> displacement is given as 60mm, all directions.
>>
>> Question 1: does anyone have a reputable calculation reference for the
>
>> natural (slosh) frequency of a rectangular tank with known dimensions,
>
>> fill depth fluid density and viscosity?
>>
>> Question 2: It appears to me that unless the vibration spectrum is
>> known, it is not possible to calculate the stresses in the tank walls.
>
>> For a single shot, the additional peak stresses would be somewhat less
>
>> than 5 or10 times those generated by the hydrostatic case alone.
>> However if the exciting frequency matches the natural frequency, then
>> some fairly intense loads could be generated, although it seems fairly
>
>> unlikely. Has anyone seen a design solution for designing rectangular
>> tanks subject to this type of loading? I imagine it should be
>> reasonably common for ships, planes, autos and the like, but I dont
>> seem to have anything on the shelves. I may wimp out and baffle the
>> tank so the oil moves as a solid mass, but this is rather inelegant
>> and may cause air release (letting the gas bubbles rise to the top)
>> problems.
>>
>> Thanks in anticipation.
>> Cheers
>>
>> Steve
>>
>>
>>
>>
>>
>>
>>
>>
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>> http://www.pipingoffice.us/ =========================================
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>>
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>>
>>
>>
>>
>>
>>
>
>
>
>
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Received on Tue Oct 04 15:46:00 2005
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