Thermal expansion
Thermal expansion
(OP)
Hi Guys,
In my current project for Indirect heaters, I would like to calculate the Thermal expansion of the tubes of size 30" OD with the design temperature of 300 Deg F which runs for 52' in length. I took the linear co-efficient of expansion as 8.30E-05 for carbon steel pipes and was able to calculate the expansion in length wise. But I need the expansion in Diameter wise. That is how much will a 30"OD expand?
Need all your expertise in this.
Thanks in advance,
Aravind Sujay
In my current project for Indirect heaters, I would like to calculate the Thermal expansion of the tubes of size 30" OD with the design temperature of 300 Deg F which runs for 52' in length. I took the linear co-efficient of expansion as 8.30E-05 for carbon steel pipes and was able to calculate the expansion in length wise. But I need the expansion in Diameter wise. That is how much will a 30"OD expand?
Need all your expertise in this.
Thanks in advance,
Aravind Sujay





RE: Thermal expansion
Just treat the 30" o.d. as you did the length
30*8.05*10^-5*temp diff
regards
desertfox
RE: Thermal expansion
It appears that the thermal linear expansion coefficient for steel is in error. It should be 8.3×10-6/oF. Kindly confirm.
RE: Thermal expansion
Yes it should be 10^-6 I agree.
When I look the value up it says 6.3* 10^-5 however I wonder what the value is at 300F as the figure I have here is at room temp.
regards
desertfox
RE: Thermal expansion
To desertfox:
• The figure quoted by you at ambient temperature is too high by a factor of 10.
• The figure I quoted suits the range in question.
• I found the following link which may be useful:
http://w
RE: Thermal expansion
Are you trying to calculate expansion of this heater for a stress analysis of piping that is attached ?
-MJC
RE: Thermal expansion
Perry (6th Ed.) gives for steel's linear thermal expansion, the following equation:
Lt is the length at t in oC
Lo is the length at 0oC
α = 0.1118×10-4
β = 0.0053×10-6
The equation is applicable over the temperature range 0oC→750oC.
RE: Thermal expansion
Thanks for all your answers.