×
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

Sheet material for a sliding seal.

Sheet material for a sliding seal.

Sheet material for a sliding seal.

(OP)
Attached is an image of a "pad" seal we use on Ball tube Mill.
We want to improve the service life a lot.

The sealing element ( pad ) is shown as a red strip.
The OD is about 65 inches. The pad radial thickness is about 4 inches.
Historicaly We have required the seal to be "one piece" with an overlapping joint. It has to be cut so it can be installed with the machine assembled.

The surface speed is about 240 fpm.
On one side is relatively clean ambient "seal air" at 5 psi or less.
On the other side is ambient power plant air.
The pad seal is initially flat and preloaded about 1/8 inch.
It is backed up by spring steel fingers shown in green.
The rotating component is cast iron, or sometime steel that starts out finished to about 16 µin Ra maximum.

Currently we use a few different gasket materials for the pad. Typically I believe they are fiberglass type materials impregnated with coatings as would be used for pipe flanges.
We lubricate them at installation with some fancy thread lubricant for oil industry drill collars and drill pipe. Re-lubrication while assembled is impossible with the current design.

I'm wondering if some other sheet material would be more durable when continuously sliding than "gasket" material, but don't know if that would be a urethane or filled teflon or something else altogether.
I am more interested in starting with the experiences of the motley crew here on ENG-Tips than a "sales engineer" that answers the phone at a plastics supplier.

RE: Sheet material for a sliding seal.

If preload is not important to sealing performance, I'd try a carbon filled PTFE.

Sorry, no "killer app" analog experience to suggest it will be ideal for your situation.

RE: Sheet material for a sliding seal.

We make long life abradable seals for compressors. Fluorosint 500 or Duratron PAI are used depending on temperature, chemistry, and loading.

________________________________________
Mitsubishi Chemical Advanced Materials
www.mcam.com

RE: Sheet material for a sliding seal.

(OP)
thanks all.

Dan T

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! Already a Member? Login


Resources

White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. Download Now

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