RE: an question

From: <Jarot>
Date: Tue May 21 2002 - 00:38:00 EDT

Hi Balaji,

I think you have some confusing to make different between Operating case and Expansion Case.
In Stress Analysis we know such as :
Four load condition:
1. Sustain condition: Weight + Pressure
2. Operating condition: Weight + Pressure + Thermal (thermal Displacement of equipment nozzle include) 3. Expansion condition: case 2 - case 1 = Thermal 4. Occasional (seismic, wind, Shock Force)

So from the description above there is a different between Expansion case and Operating case.
And for Stress evaluation we use sustain and expansion case (code requirement, ANSI B31.3)

But for support design we need to know actual force and moment worked on.
So in this case we use sustain load case and operating load case which one greater (this case ignored occasional load case, normally occasional is highest value to design support, but not almost).

Regards,

Jarot Mursito.

-----Original Message-----
From: BBalaji@technip-coflexip.com [mailto:BBalaji@technip-coflexip.com]

Sent: Wednesday, May 15, 2002 5:08 PM
To: pipingdesign@yahoogroups.com
Subject: [PipingDesign] an question

STRESS ANALYSIS IS THERE ANY DIFFERENCE OF BEHVAOUIR OF A PIPING SYSTEM WHILE SEEN IN OPERATING CONDITIONS AND EXPANSION CONDITIONS? SAY IF THE DESIGN TEMPERATURE IS 400 C
THE ANALYSIS SOFTWARE CALCULATES LOADS,
THE LOAD FROM OPERATING VARIES WITH LOAD FROM EXPANSION,WHY SO? AT WHAT TEMPERATURE IS THE LOADS BEING CALCULATED ,CONSIDERING EXPANSION
AND OPERATING CRITERIA? IF MY UNDERSTANDING IS RIGHT,THAT OPERATING AND EXPANSION ARE ONE ANOTHER
THE SAME. B.MAHESH BALAJI,
ENGINEER-PIPING,
TECHNIP KTINDIA LTD.,

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http://docs.yahoo.com/info/terms/ Received on Tue May 21 00:38:00 2002