TinnerFlow
Elbows & Offsets ยท Elbows & Offsets

Vertical-to-horizontal riser elbow

Base/top of riser

ConnectionFlanged/welded/gasketed
SupportRiser support + elbow support

Before you start

  • Confirm the riser load path, riser support, elbow support, joint type, lateral or thrust restraint, and both run centerlines.
  • Verify the elbow is not intended to carry vertical riser dead load.
  • Inspect the fitting, flanges or ends, support points, and adjoining riser section.
  • Plan rigging and temporary restraint before setting the fitting.

Tools and materials

Vertical-to-horizontal riser elbow, approved flanged, welded, or gasketed joint components, structural riser support, dedicated elbow support, lateral or thrust restraints, rigging, plumb laser, level, and hand tools.

Lay it out

  1. Establish the riser plumb line and horizontal run centerline.
  2. Mark the elbow support and load-transfer points.
  3. Coordinate lateral restraint and access.

Set and support it

  1. Install the riser support before setting the elbow.
  2. Install the independent elbow support.
  3. Keep temporary rigging until both load paths are verified.

Make the connection

  1. 1

    Set the elbow on its dedicated support.

  2. 2

    Bring the vertical riser section into plumb alignment.

  3. 3

    Complete the vertical joint without transferring riser weight to the elbow.

  4. 4

    Recheck the horizontal tangent.

  5. 5

    Connect the horizontal run.

  6. 6

    Install lateral or thrust restraint where required.

  7. 7

    Transfer loads to the riser support and elbow support.

  8. 8

    Release rigging slowly and watch for settlement.

Check the install

  • The riser dead load is carried by the approved riser support.
  • The elbow has independent support.
  • The vertical run is plumb and the horizontal run is aligned.
  • Required lateral or thrust restraint is installed.
  • Neither joint moves when temporary rigging is removed.

Common mistakes

  • Letting the elbow carry the riser.
  • Connecting the horizontal run before the riser is plumb.
  • Releasing rigging before load transfer.
  • Omitting lateral or thrust restraint.

Stop and ask

Stop if the elbow is carrying riser dead load, the riser support is incomplete, or the required lateral or thrust restraint is unclear.