Liquid Expansion

[lsuleigh]

Does anyone know a good site to find cubical exapansion coeffecients?? It would be really helpful to have a list of these values in per ºF for typical compounds.
Any help would be greatly appreciated.

 

[EGT01]

Don't know of a "site" to direct you to but take a look in this thread...
thread124-133483
there's a number of other references that shouldn't be too hard to get.

Here's an updated link to the Chemical Processing article I mentioned in the referenced thread.

http://www.chemicalprocessing.com/articles/2001/324.html

The Chemical Processing article also has a discussion about how to determine the cubical expansion coefficient for any chemical knowing the fluid density at the initial and final temperatures.

 

[lsuleigh]

Thanks so much! I'll check it out!

 

[Latexman]

lsuleigh,

If your scenario is ambient heating only, it is acceptable by established industry practice to NOT provide calculations and to install a small PSV. I have seen "small PSV" being a 1/2" to 1", with 3/4" being the most common. Therefore, IF your scenario is ambient heating only, what you are doing may be a waste of time.

Since you are new to this forum and you did not describe what you want the data for, I thought I'd add this. It may not apply. If it does not, sorry!

Good luck,
Latexman

 

[curve3104]

Latexman,

Basically what you are saying is if you have a long transfer line where liquid can be blocked in, and is exposed to ambient/solar heat input, provide anywhere from a 1/2" to 1" TRV at the desired set pressure and you are good to go?
I assume since no calculations are required, this is not an ASME code device? I know the B 31.3 & 31.4 codes mention this type of releif device, but does not specify application criteria.

Thanks again

 

[Latexman]

curve3104,

Yes, the required capacity will typically be very small for a pipeline within a plant, even a very large plant. My company has plants that are huge, world scale petrochemical plants (x miles by y miles big) and it's not a problem. Within a particular unit or block of the plant, relieving a few cc's drops the pressure like a rock. However, if your application is for a very long "cross-country" pipeline, you should evaluate it.

Good luck,
Latexman

 

[UKCats]

Cubic expansion coef. can be calcualted by taking the difference in speciic volume at two different temperatures divided by the average specific volume, divided by the temperature spreade.

Beta = ((n2-n1)/navg)/(1/t2-1/t1)
where n (nu) equals specific volume or 1/density

Type in Assessing Thermal Relief Needs in google and this article will come up. I wrote the article.

http://www.chemicalprocessing.com/articles/2001/324.html

 

[lsuleigh]

Thank you so much for all the help!