Chris,
You have confirmed my suspicions which is a great help, many thanks.
I havent been able to find Fram Warner Lewis on the net. I wonder of they still exist or were swallowed up in the great economic rationalisation we have had to go through? It is highly unlikely that there will be records around now.
In my experience surge doesnt pop relief valves on vessels, result in vessel failure but if it does permanent damage it may be a split pipe or a support pulled from the wall. The process of undertaking a risk assessment and document the way forward is where we are at. With a number of parties involved getting sign off is going to be tough without hard facts like code compliance, manufacturers details etc.
There has been an argument put that the properties of steel are improved with rapid applied loads. The yield stress may in fact double when the load is applied at 25m/s but plateaus after this level. Other researches in the field of fracture mechanics report that brittle failures may occur when very rapid loads are applied. However the code is silent on such things.
Geoff
Christopher Wright <chrisw@skypoint.com> wrote:
On Oct 27, 2005, at 9:02 PM, Geoff Stone DD&D Australia wrote:
> The vessel doesnt have a code plate.
>
> The vessel is 1000mm diameter 1500mm high approximately.
Big enough so it'd need to carry a stamp in most states. The bottom
line is that there's no way to tell how it was designed unless you can
pump the manufacturer for details. The likelhood is that it's not a
Code vessel, although it may have been designed with the Code in mind.
As far as surge goes, there aren't any Section VIII specifics on what
to do. If surge pressures are important, the 125 psi pressure on the
tag probably took those into account, but they probably took a
roll-your-own approach. You can probably take a WAG at what material
was used and how it was welded and juggle back and forth to see if you
think there's enough margin for what you suspect the surge pressures
might be. After quizzing you all day, I really haven't been much help,
but there's only so much to be done by e-mail.
Christopher Wright P.E. |"They couldn't hit an elephant at
<a href="/group/PipingDesign/post?postID=c-Cy0lhv-kwtSgBoDagaQySWwC0MG4TADn60hTpHca3M5U3UuraKRr7gz6QhZeJVu-Xkg4ieANcSOP8nxds">chrisw@skypoint.com</a> | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania1864)
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[Non-text portions of this message have been removed] Received on Thu Oct 27 23:41:00 2005
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