×
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

Oil-free compressor piston/ring design

Oil-free compressor piston/ring design

Oil-free compressor piston/ring design

(OP)
I'm working on designing a piston / cylinder / ring assembly for a large (eg. up to 6" bore) medium-high-pressure (eg. 30 bar) compressor requirement.

Anyone know of available technology capable of doing this (eg. rings).

Alternatively, looking for someone capable of designing this. Payment available to right qualifications, remote working fine.

Pechez les vaches.

RE: Oil-free compressor piston/ring design

Not sure what your asking, but if you google reciprocating compressor parts you should find plenty of suitable ring materials...

-The future's so bright I gotta wear shades!

RE: Oil-free compressor piston/ring design

BTW PTFE and PEEK are the typical materials used in oil free service.

-The future's so bright I gotta wear shades!

RE: Oil-free compressor piston/ring design

Rulon has also been mentioned for some high temperature and non-lubricated applications. Perhaps Chemloy may also be investigated. Magazines like "Assembly Engineering" or "Material Engineering" have carried ads. of such materials from time to time, in the past.

RE: Oil-free compressor piston/ring design

Graphited teflon is what I know uptoo 10 barg for both piston and guide rings. No problems as long as jacket cooling is good.

RE: Oil-free compressor piston/ring design

These people should fix you up.  http://www.cleecook.com/

In my industry we do up to 36" cylinders and I've seen pressures as high as 2400 psig with non lubricated pistons incorporating rider bands.

RE: Oil-free compressor piston/ring design

(OP)
Thanks all, especially dcasto, who's tip earns a star.

Pechez les vaches.

RE: Oil-free compressor piston/ring design

PEEK is the first material that comes to mind for non lubricated rings/parts in any service.
Somehow you seem to be trying to re-invent the wheel! There are dozens of companies out there already manufacturing such compressors.

RE: Oil-free compressor piston/ring design

I used to work at Bristol Compressors.  They were looking into a crimped expander ring design the last time I was with them.  It expanded to fit.  Without wear rings, the piston/cylinder clearances must be in tenths of a thousandth of an inch to prevent blow-by.  It seems teflon has really good friction and temperture properties.  My 2 cents anyway.  I wasn't in R&D.

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