RE: [PipingDesign] thermal movement calculation

From: <Teli>
Date: Sat Sep 20 2003 - 04:11:00 EDT

Tower is subjected to differential temperature zones.These various temperature zones are called Temperature transition zones. Now for Pack tower, the individual Bed temperature (in & out) are given along with Vapor-liquid loading which is given in the Process data sheet. Similar data for tray tower can be obtain from the Process data sheet.

The Process licenser is owner & hence responsible for this data. Loading accurate temperatures as per Temp Trans zone will give the accurate stress analysis result. However Average temperature of Tower outlet (mainly vapor outlet) & bottom outlet gives fairly good results in Caesar.

Any body throw some more light.

Shashi Teli.

-----Original Message-----
From: Paul Bowers [] Sent: Saturday, September 20, 2003 12:31 PM To:
Subject: Re: [PipingDesign] thermal movement calculation

> Which is the right method of calculating thermal movement of an equipment
> when there are more than one incoming or outgoing flow in the equipment.
> my problem is which should be followed either on the basis of average
> or average alpha (coefficient of thermal expansion).
> for very tall columns like crude or vacuum column in cdu/vdu unit which
would be
> the governing fluid (either incoming or outgoing or both) for thermal
movement calculation
> at particular height.
> please give a rightful idea regarding this.

One recent offlist comment I've had is "why do some people submit not enough specific information" about what they are inquiring about.

Your question is likely easily covered by standards, unless you are doing molecular-level research. In which case, this is not the place to ask questions.

On the other hand, students often post theoretical questions here for "homework help".

Do you know what the coefficient of expansion is for your piping and vessel? Will it grow (or shrink) depending on the temperature differential? Is the piping material different from the vessel? Where is the installation? If it is northern, but not arctic, you will have to accomodate ambient temperatures that range from freezing to hot and humid. Have you looked at this possibility? What is your process fluid(s)?


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Received on Sat Sep 20 04:11:00 2003

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