View Full Version : JET-A1 density depending on fuel temperature
Mäx Reverse
23rd Oct 2019, 05:53
Hi gents,
I'm looking for the relationship between temperature and density for JET-A1 fuel. On the web I was able to find the density range only (.775 - .840), but not the correlated fuel temperatures. I would like to know how exactly the density changes when the fuel temperatur varies (e.g. during flight or due to mixing during refuelling).
Anybody in the postion to help? Either formula or table would be greatly appreciated.
Cheers and kind regards,
MAX
KRviator
23rd Oct 2019, 06:25
Ask and ye shall receive.
Each line is a specific density of jet fuel so find the one you want, and you can follow it through. Table courtesy of THIS (https://www.engineeringtoolbox.com/jet-fuel-temperature-density-petroleum-volume-correction-ASTM-D1250-gravity-d_1944.html) website.
https://cimg4.ibsrv.net/gimg/pprune.org-vbulletin/561x649/jet_density_temperature_c_ee51709fbad8be3043a656f23dc8a18fc7 33f568.jpg
mustafagander
23rd Oct 2019, 09:59
Be aware that fuel SG can also depend on the feedstock and the refinery.
Mäx Reverse
23rd Oct 2019, 16:04
Ask and ye shall receive.
Thanks a lot!
Best regards, MAX
Dave Therhino
27th Oct 2019, 02:04
This document is broadly used by industry and regulators.
https://apps.dtic.mil/dtic/tr/fulltext/u2/a132106.pdf
See page 25 for Jet A density vs temperature characteristics.
Capn Bloggs
27th Oct 2019, 08:52
How can Jet A1 density be so varied? 40kg for 800kg at the same temp and volume? I would have thought that the standard would have been much tighter than that.
gearlever
27th Oct 2019, 15:34
How can Jet A1 density be so varied? 40kg for 800kg at the same temp and volume? I would have thought that the standard would have been much tighter than that.
Amazing, indeed.
It's even more 775/840 kg/m3 (https://www.exxonmobil.com/en/aviation/products-and-services/products/jet-a-jet-a-1)
according to ASTM D1655 specification