Helium Leak Detection
Diagnostic testing to locate the source after a failure has been confirmed with positive isolation. PTTI introduces helium and uses a specialized sniffer to detect PPM concentrations against atmospheric air.
Manufacturer-certified · Testing UST & AST systems since 1997 · Serving 13 states and expanding
Pinpoint leak location after a failure has been confirmed with positive isolation in a product line, tank, Stage I system, or containment system.
Testing Method
Helium leak detection is a diagnostic procedure, not a routine compliance test. PTTI uses it after a failure has been confirmed with positive isolation and the customer needs to localize the leak before repair.
The procedure starts by purging the system completely and removing all fuel. Helium is then introduced into the system being investigated. For a line, helium is introduced into the line. For a Stage I system, a vent tree is installed on top and helium is introduced through it. For a tank, helium is introduced directly.
The technician drills holes in the concrete above the suspected run. A specialized sniffer detects helium in parts per million against the surrounding atmospheric air. The concentration pattern pinpoints the leak location, with higher readings closer to the source.
- Equipment
- Helium cylinder. Vent tree for Stage I systems. Concrete drill. A specialized helium sniffer that reads concentration in parts per million.
- Frequency
- As needed, as a post-failure diagnostic.
- Deliverable
- A notes-and-findings report identifying the leak location, with photo documentation of the drilled probe pattern and the concentration map. PTTI completes the diagnostic and locates the leak. The repair itself is handled separately.
When We Use Helium Leak Detection
-
1
After a Failed Line Tightness Test
Used after failure has been confirmed with positive isolation.
-
2
After a Failed Tank Tightness Test
When audible leak detection identifies a problem but a physical location is needed for excavation.
-
3
After a Containment Failure
A containment sump or transition-sump leak that requires pinpoint location before excavation.
Helium Leak Detection, frequently asked.
When do you use helium leak detection?
PTTI uses helium leak detection after a failure has been confirmed with positive isolation and the source needs to be located. The setup depends on the system being investigated. It follows a failed line tightness test, tank tightness test, Stage I test, or a containment failure.
How accurate is helium leak detection?
The sniffer reads helium concentration in parts per million against atmospheric air, and the concentration pattern localizes the leak for excavation or repair, with higher readings closer to the source.
Is concrete patching part of the helium scope?
PTTI completes the diagnostic and locates the leak, and delivers a notes-and-findings report. Concrete patching and the repair itself are the operator's responsibility once the leak is located.