Steam Line Losses
Steam Line Losses
(OP)
I'm trying to calculate the thermal losses in a steam line. For example, I have a 4" steam line that is roughly 1000ft long and there is roughly 2000 lbs/hr of 150psi steam flowing through it. I'm trying to calculate the loss in the line in lbs/hr so that I can have an estimate to the actual steam load of the facility minus the line loss. All the pipe is above ground with 3" insulation and an aluminum jacket. Thanks for any help.





RE: Steam Line Losses
Good luck,
Latexman
RE: Steam Line Losses
I provide no warranty with regards to the accuracy and/or acceptability of this spreadsheet and suggest that you validate its results against known data before using if for anything other than preliminary estimates.
Note: this spreadsheet assumes calcium silicate insulation.
ttp://files.engineering.com/getfile.aspx?folder=09e9584a-b6f4-4dcb-8b6b-acfaee82989e&file=Glycol_Tracing_&_Heat_Loss.xls
RE: Steam Line Losses
rneil - I tried to download your spreadsheet but nothing happens. I click on the "Glycol Tracing" link and it opens another window but nothing else happens. Any ideas?
Thanks
RE: Steam Line Losses
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RE: Steam Line Losses
You can use this calculator from Spirax
http:/
Or the following diagrams
h
RE: Steam Line Losses
RE: Steam Line Losses
U - overall heat transfer coefficient
A - heat transfer area (outside area of insulated pipe)
ΔT - temperature difference (steam - ambient)
Use consistant units.
Good luck,
Latexman
RE: Steam Line Losses
RE: Steam Line Losses
RE: Steam Line Losses
You can find some guidelines in the link below
http://w
RE: Steam Line Losses
RE: Steam Line Losses
The radiative part of the heat loss can be accounted for using the Stefan-Boltzmann law
Q = ε*σ *(Ts^4 – Tamb^4)*A
where:
ε = emissivity of the surface (values are tabulated)
σ = Stephen-Boltzmann constant 5.67 *10-8 W/(m^2* K^4)
Ts = Surface temperature [K]
Tamb = Ambient temperature [K]
A = Area of the emitting surface [m^2]
I also suggest you to take a look at the link below
http://www.cheresources.com/insulationzz.shtml