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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.

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