Vacuum Box Testing

Vacuum Box Testing is a localized leak detection technique used to verify the integrity of tank bottom welds and floor joints. This method is commonly applied during tank construction, repair, or maintenance activities to confirm weld soundness and leak tightness.

Vacuum box testing provides a simple and effective means of identifying through-thickness defects and pinhole leaks.

Why Vacuum Box Testing Is Required

Even small leaks in tank floors or weld joints can lead to product loss and environmental contamination. Vacuum box testing ensures that repaired or newly welded areas are leak-free before tank commissioning or return to service.

Scope of Inspection

Vacuum box testing is applicable to:

Tank bottom weld seamsShell-to-bottom weld jointsRepaired floor plate areasLocalized inspection zones

Inspection Methodology

Vacuum box testing is performed by applying a soap solution over the test area and placing a vacuum box over the weld or joint. A controlled vacuum is applied, and the formation of bubbles indicates the presence of leaks.

Inspection results are documented, and any detected leaks are repaired and re-tested to ensure integrity.

Key Benefits

Vacuum box testing provides direct leak detection, simple execution, reliable results, and compliance with tank inspection and construction standards.

Industries and Applications

Vacuum box testing is widely used in refineries, oil terminals, petrochemical plants, chemical storage facilities, and tank construction or repair projects.

Vacuum Box Testing is a proven and effective method for verifying tank floor and weld integrity. By ensuring leak tightness, this service supports safe commissioning and long-term tank reliability.