×
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

NATURAL GAS PIPE LINES.........PITTED AREA SAFTY

NATURAL GAS PIPE LINES.........PITTED AREA SAFTY

NATURAL GAS PIPE LINES.........PITTED AREA SAFTY

(OP)
WHAT ARE THE MEASURES AND WAYS TO MAKE PITTED AREA/SPOTS ON PIPES TO MAKE IT SAFE TO AVOID LEAKS AND OTHER HAZORDS,AND HOW PITTING ACCURES WHILE PIPES ARE LYING OUTSIDE THE GROUND(EARTH),AND HOW IT STARTS IN THE GROUND.

RE: NATURAL GAS PIPE LINES.........PITTED AREA SAFTY

Grind the pits out and measure remaining wall thickness--must be above minimum--don't forget corrosion allowance too.

Wet storage, differential oxygen conditions, and carbon steel will pit unless something is done to prevent it--like coating, etc.

Don't allow pipes to sit on ground.  As a minimum, put thick layer of gravel (for drainage) under them.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein  

RE: NATURAL GAS PIPE LINES.........PITTED AREA SAFTY

To measure the corrosion you can use a pit gauge or pencil probe with UT flaw detector. Once corrosion is mapped, complete fitness for service evaluation (B31G, RStreng, API 579 etc.). Many repair options available, sleeves are commonly used on gas pipelines for external corrosion.
As far as how the corrosion accures, or occurs, the iron in the pipe (Fe) is reacting with oxygen in water to produce iron oxides/hydroxides, but this is a very simple explanation, you can easily look this up in any corrosion book and background info. I highly recommend you seek outside help from consulting company in the area of NDT to map corrosion& pipeline integrity to complete fitness for service and repair options to assist.

RE: NATURAL GAS PIPE LINES.........PITTED AREA SAFTY

Fastest and cleanest method to repair local pitted pipe is a composite repair. Minimal training to install. Mostly designed for short section of pipe. Not intended for full stick lengths. Many suppliers to choose from.

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