Note: I did find a math operator error in my Long side membrane stress equations. The new stress values are in line with what was expected.
Arcticdesert
I am working on calculations for an air cooler box header to appendix 13 FIG 13-2(a)(2). I am having a hard time understanding which calculations to use for the ligaments and how they relate to what I am seeing on this job.
Both the tube and plug sheet have 96 holes in 4 rows of tube holes in...
Our plant operates in these conditions. We do not see any significant loosening in winter conditions as long as the thermal expansion coefficients for the bolting material and the bolted material are similar.
You may want to move to a low temperature bolt and nut material at those temperatures...
We use DOW chemical DOWFROST proplyene glycol for winter hydrotests and heat traceing. DOW also makes DOWTHERM ethylene glycol, and both have engineering data contained in litature from dow.
http://www.dow.com/webapps/lit/litorder.asp?filepath=heattrans/pdfs/noreg/176-01419.pdf&pdf=true
I have...
Donkin,
I looked in the book "Introduction to Cold Regions Engineering" by T McFadden and D Freitag and found this equation for heat loss from an above ground insulated pipe.
(One dimensional heat flow)
This equation assumes steady state heat transfer, so is it is just a way to...
Donkin,
Are you limited to the type of diesel product in your system?
If not, you could change during the winter to a blended #2 ( I assume you are talking road Diesel) where the cloud point is -12ºF and the pour point is -15ºF. At those temperatures you would not have any problems.
Many...
OWG,
What sort of temperatures is your plant opperating in? Do you have much wind when the temperatures are cold?
We use 150# steam for just utility and stripping. We see temperatures as low as -65ºF. All heat tracing is Propylene Glycol.
The our plant was originaly steam traced, but some of...
KazakhJeff ,
Some of the names for PSV's we use are Crosby, Teledyne Ferris, CONSOLIDATED, ANDERSON-GREENWOOD,ENARDO.
Normal lenght of time is set generaly by process conditions and prevous inspection history.
Max lenght of time I believe is 10 years. In my state we follow the National Board...
We insulated one of our Asphalt tanks last year with a system by Insultherm. The system consists of rings welded to the top of the tank, 4" of mineral wool and topped with a seamed aluminum cladding. The system installs quickly and after it is seamed is very strong.
The system is called...
