Sump containment testing, hydrostatic and DriSump.
Submersible and dispenser sump containment under PEI RP1200 C-4. Hydrostatic plus the DriSump vapor method, every configuration covered.
Manufacturer-certified · EPA 40 CFR Part 280 · Testing tanks since 1997
Submersible turbine sump (STP) containment. Dispenser sump (UDC) containment. Transition sumps where piping changes from aboveground to underground or single-wall to double-wall.
How we run it.
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.
DriSump is a completely different methodology from hydrostatic. DriSump testing requires installation as a first step: probes are drilled into the concrete around the sump and capped off. This is done for every dispenser and every tank in the area.
Once installed, the test itself is fast. A 5-minute vapor test reads whether there is any leak in the containment. The probe network detects vapor leakage that would otherwise require draining and refilling the sump with water.
- Equipment
- Water and a measuring stick for the hydrostatic method. The DriSump probe array, a concrete drill, and a vapor test apparatus for the DriSump method.
- Frequency
- Triennial cycle in most states.
- 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.
What we look for.
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1
Free product, water, or debris in the sump
Indicates an active leak or a seal failure.
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2
Damaged wiring
Wiring routed through the sump that has degraded or been damaged.
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3
Flex piping degradation
Flex connectors growing, deforming, or leaking at fittings.
Frequently asked.
What is the difference between hydrostatic and DriSump methods?
Hydrostatic testing fills the sump with water and measures the level over an hour. DriSump is a vapor method: probes are drilled into the concrete around the sump once, then a 5-minute vapor test reads whether containment is leaking, with no water to add or remove. PTTI runs both.
Which sumps need testing?
Submersible turbine (STP) sumps, dispenser (UDC) sumps, and transition sumps where piping changes from aboveground to underground or single-wall to double-wall.
What if my sump fails the hydrostatic test?
PTTI documents the failure, commonly free product or water in the sump, damaged wiring, or flex-piping degradation, and prepares the record. PTTI prepares the documentation; the operator files it with the state.