Treatment stays inside the marked boundary
The work stays inside the marked area until the likely substance, nearby surfaces and lining compatibility are understood. Contaminated washings also need a contained collection route.
Recovered material must stay inside the control boundary
Containment begins at the affected surface and follows the material through recovery.
The control boundary around the affected surface
Site records should identify the likely contaminant and anything nearby that must be protected. The contractor checks compatibility before spreading treatment beyond that boundary.
A vessel prepared for repair may need surfaces exposed around a particular defect. A tank returning to process may have different criteria. The contractor links the clean to its next use and can align it with The tank inspection preparation service where access for examination is the priority.
Unknown contamination remains inside the marked control area until identity, compatibility and the route for washings are understood. Entry, atmosphere and rescue controls are assessed separately by competent specialists.
Contaminated washings should have an identified collection route before the surface is disturbed. Keep the original residue and introduced cleaning liquid visible when planning the recovered-waste route.
Unknown contamination should be contained and identified before treatment spreads beyond the affected area. The tank lining, previous contents and route for contaminated washings all influence the method. Cleaning can expose the surface for inspection, but it cannot determine the cause or integrity of the tank.