×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Specific Heat of MIL-PRF-7808?????

Specific Heat of MIL-PRF-7808?????

Specific Heat of MIL-PRF-7808?????

(OP)
Can't find this info anywhere? any help appreciated

Warren

RE: Specific Heat of MIL-PRF-7808?????

I'm not familiar with ester-based synthetic lubricants, but can suggest a method for finding the answer;

Go to ASSIST (http://assist1.daps.dla.mil/quicksearch/) and download 2 documents:

MIL-PRF-7808L LUBRICATING OIL, AIRCRAFT TURBINE ENGINE, SYNTHETIC BASE
and
QPL-7808-38, the latest Qualified Product List for MIL-PRF-7808.

The QPL lists brand names & manufacturers.  You should be able to find their websites & download the MSDS, which may give the heat capacity directly, or else you can add up those of the constituents.
 
And of course, the manufacturer's Customer/Technical support should be able to provide the info.

RE: Specific Heat of MIL-PRF-7808?????

Mobil Jet 254, Jet II, SHC 824
Shell Aeroshell 500
Exxon 2380
Akzo Fryquel GT

All of the above are typical synthetic oils used in gas turbines and I know for sure the last one is ester based.

Seems like I also had the same problem and could not find any published data so I had to call the manufacturer.

Be careful using an ester based oils as there are certain types of seal materials that cannot be used in valves, etc. with this type of oil.  You also have to be careful not to used any copper based materials as I recall.

RE: Specific Heat of MIL-PRF-7808?????

On the last post it should read AeroShell 500 is to MIL-PRF-23699, while AeroShell 308 is to MIL-PRF-7808.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources