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


Verifying pipe centerline elevations

Verifying pipe centerline elevations

Verifying pipe centerline elevations

I'm on a facilities project with several above grade tie ins coming up. Each tie in is new to old with a flanged spool piece getting dropped in during the outage. In the weeks leading up to the outage, the Operations group is requesting recurring checks on centerline elevations to ensure they don't run into any issues lining up the spools during the time sensitive shutdown. Is there a quick and dirty way to perform these checks using a level, tape, T square, string, center finder, etc. rather than setting up the level and rod at every spot and shooting elevations? This will occur when the surveyor is on site but I'm just looking for an old fashioned welder's method to have another paper trail of QA/QC documentation.

(The basis for this is historically poor soil conditions at said tie in location)

Thanks, appreciate any feedback.

RE: Verifying pipe centerline elevations

Insulated pipe or bare?

I stand directly underneath each pipe (if high up) and use a vertical laser (mine from Home Depot which generates 5x laser lines: two up-down vertical, two left-right, and one forward laser pointer) to find the two edge of the pipe in question. The vertical and horizontal pointers are always perpendicular to each other, the laser head is self-leveling, so I always know vertical. The vertical "down" point shows me the position on the ground of whatever I am aiming at above the tripod.

Then from the two edge points marked on the concrete under the pipe - which I "draw" on the concrete or street with a marker - I get the centerline position. Use a laser distance reader from the concrete (or street) up to the center of the bottom of the pipe.

You know the OD from the two points, so now you calculate the CL height of the pipe above floor or street or slab for that specific point.

Go to the next point. Repeat.

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!


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