Containment Sump Testing
Hydrostatic and Dri-Sump testing for containment sumps, with the method selected for the site and applicable requirements.
Manufacturer-certified · Testing UST & AST systems since 1997 · Serving 13 states and expanding
Containment sumps at submersible turbine pumps (STPs), under-dispenser containment (UDC) sumps, and transition sumps where piping changes from aboveground to underground or single-wall to double-wall.
Testing Method
Hydrostatic Containment Sump Testing
Hydrostatic testing follows PEI RP1200 section 6.5. The technician removes debris from the sump and inspects for visible damage. Water is added until it covers the highest penetration by at least 4 inches, or to within 1 inch of the top, whichever is lower. After a 15-minute settle, the initial water level is measured; after 1 hour, the ending water level is measured. The sump passes if the level changes less than 1/8 inch in 1 hour.
Dri-Sump Containment Testing
Dri-Sump uses aerosol and a vacuum to test containment without filling it with water. Access tubes draw air from the surrounding backfill into a viewing chamber, where a laser reveals escaped aerosol.
- Equipment
- Water and a measuring stick for the hydrostatic method. Dri-Sump equipment and the required access tubes.
- Frequency
- The testing or monitoring interval depends on the containment configuration, use, and governing requirements.
- Deliverable
- An audit-ready containment sump test record for every sump tested, sent after the visit and formatted for your state file. PTTI prepares the record; your operator files it with the state.
Common Findings
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1
Free Product, Water, or Debris
Accumulated product, water, or debris may need removal before testing.
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2
Damaged Wiring or Electrical Conduit
Damaged wiring or electrical conduit within the containment sump.
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3
Penetration Boot Degradation
Worn or damaged seals around pipes or conduits passing through the sump.
Containment Sump Testing, frequently asked.
What is the difference between hydrostatic and Dri-Sump methods?
Hydrostatic testing fills the sump with water and measures the level over an hour. Dri-Sump uses aerosol and a vacuum to check containment without filling it with test water. PTTI performs both methods.
Which containment sumps need testing?
Containment sumps at submersible turbine pumps (STPs), under-dispenser containment (UDC) sumps, and transition sumps where piping changes from aboveground to underground or single-wall to double-wall. Testing requirements depend on how the containment sump is used and monitored.
What if my containment sump fails the hydrostatic test?
PTTI documents the failure, commonly containment damage or penetration-boot deterioration, and prepares the record. PTTI prepares the documentation; the operator files it with the state.