Smart questions
Smart answers
Smart people
Join Eng-Tips Forums
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login




Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • 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!

Join Eng-Tips
*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.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Is there a list of acceptable materials for LL radiation?Helpful Member!(3) 

Lovison (Mechanical) (OP)
4 Mar 02 14:39
Has anyone a list of acceptable materials such as;

Stainless Steel, elastomer's, motor's and lubricants
that are acceptable in LL radiation service?

What is considered LL radiation?

I've checked out nrc web pages and can't find anything
really outlined.  A thread connection would be nice
if some has a reference for me.

Wayne E. Lovison
service-parts@naglepumps.com

Guest (visitor)
5 Apr 02 14:15
Title 10 Code of Federal Regulations Part 20 is the regulations pertaining to the release limits of radioactive materials.  10CFR 20 can be found at www.nrc.gov
Helpful Member!  ag (Chemical)
5 Jun 02 12:29
hi
there is no such thing as ll radiation. probably u r referring to radiation caused by low level activity sources. normally in radioactive service SS304L is normally used as vessel and piping moc.
ag
Helpful Member!  BigAL (Materials)
6 Oct 03 22:56
Generally, if your radiation level is below 1 E4 rads TID, it is considered mild environment. At this level just about any material is qualified to be used. The company  I work for has taken material to 1 E7 in various configurations.
If you are intending to sell to the Nuke Power industry, you need to set up a 10CFR50 Appendix B quality program and be set for a very stringent quality audit. Then, run the material through a test lab and see if it holds up. At that time you can offer it for sale.
jrri (Nuclear)
31 Oct 03 9:19
Generally, mild or LL radiation it is below 1E4 rads, mechanical properties of stainless steel are not affected by these levels of radiation, nevertheless other materials like elastomers, grease or oils are affected.
For example elastomers increase hardness and decrease elongation depending of the composition.
if you make a more detailed question may be possible indicate to you radiation level.
Helpful Member!  Bob167 (Mechanical)
24 Mar 04 2:53
Hi Wayne,
This is a list taken from a nuclear industry design specification:-

Recommended Materials (with 'good' stability at ambient temperatures in air with irradiation levels of 100,000 Grays):

Polyurethane, SBR Butadiene styrene, Ethylene propylene, copolymer EPDM, Polychloroprene;
Polystyrene, Polyethylene, Hypalon, ABS, PVA, Polyamide, Nylon, Polycarbonate, Polyester (mineral or glass filled), Mylar (Melinex)

Epoxy and Phenolic Adhesives

Mineral Oils (aromatics are more resistant than aliphatics) NB Bearing manufacturers will supply bearings packed with special grease if requested.

DO NOT USE:-

Fluorocarbon,  Butyl Rubber, Silicone rubber,  Neoprene, Polypropylene, Phenolformaldehyde

Natural (animal, vegetable) Oils.

Hope that this helps

Regards,

Bob

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!

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close