Styrene Monomer service line
Field Reality
A 3-inch steel line in styrene monomer service had corroded until almost nothing of the original wall was left. The reported minimum remaining wall was 0.3 mm, from an original 5.49 mm — about 94.5% of the wall gone. The line ran vertically and turned through a bend near its base, so whatever was done had to follow that geometry rather than a convenient straight section.
Key verified Field facts
- Medium
- Styrene Monomer operator-reported service
- Pressure
- 0.6 MPa operator-reported
- Asset
- 3-inch steel service line operator-reported
- Geometry
- Vertical run continuing through a lower bend observed in the Field record
- Field condition
- Severe external corrosion — reported minimum wall 0.3 mm from an original 5.49 mm, about 94.5% reported wall loss operator-reported
- Dominant hazard / constraint
- Almost no pressure-retaining wall left in styrene monomer service observed in the Field record
Resulting ISB
An ISB was constructed around the corroded run and carried continuously through the vertical section and the lower bend as one body, rather than as separate patches at separate places.
Case boundary
This Case records one unique Field Reality. It is not a construction instruction and not a template. A Solution developed for one Field must not be copied into another Field without new DendroSeal Understanding.
Field Link
The connection layer between the Field and DendroSeal. Reality can arrive before anything else is settled.