×
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

Rail Tolerances and Coating System

Rail Tolerances and Coating System

Rail Tolerances and Coating System

(OP)
Dear Sirs,

We have rails laid 20 years ago and were in service lifting ship-lift trolleys in a Naval Dock Yard Project. In the due course of its service the coating of the rails is removed with the top surface being rusted and corroded bottom in some rails, so the rails are now subject to assessment and refurbishment.

My queries is relation to the following are,

Assessment:

a. After sandblasting the rails, special profile check templates are being used by the third-party inspection agency to check the correctness of the profile and rail dimensions. Is there any standard for acceptance and rejection criteria for existing rails based on the actual dimensional checks?
b. The new specs for T rails i,e ASTM A 1, is very hard on the dimensions. If we go and compare the existing rail dimensions after sandblasting with ASTM A1 tolerances, I think we'll end-up rejecting all these rails. Pls Help....

Protection (Coating):

a. Pls recommend specific type of coating to be applied on these rails after sandblasting for re-use. should be hard-wearing, and anti-corrosive..

Thanks  

RE: Rail Tolerances and Coating System

Contact the manufacturer/supplier of the lifting system for technical assistance.

You should also make a comparison of the technical specification of the system as built versus the new specification.

 

RE: Rail Tolerances and Coating System

Rails are usually not coated.  What you are seeing is the corrosion resulting from wear and exposure.

You need to check tolerances against the equipment you are using.  If the equipment requires a certain tolerance then use that as compared to a new rail.  You can't expect a 20 year old rail to meet new tolerances.

RE: Rail Tolerances and Coating System

(OP)
Thanks.

What should be the Acceptance and Rejection Criteria while assessing such old rails. The rails visually have some rust only without any reduction in the section due to corrosion. How to prove to the Clients that we can re-use them with some refurbishment?   

RE: Rail Tolerances and Coating System

If there is no section loss from corrosion, and only the wearing surface is affected, then check the equipment that the rails support and see if the mating tolerances are OK...if so, move on.  If not, consider replacement.

RE: Rail Tolerances and Coating System

Take a section of rail out and measure the physical properties such as weight/meter of length. Compare that to new material. That would tell you the extent of the corrosion

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