ASSE 6020 flashcards
ASSE 6020 · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Backflow
- Reverse flow of water in a piping system caused by backsiphonage or backpressure, which can carry contaminants into the potable supply.
- Backsiphonage
- Backflow caused by negative or sub-atmospheric pressure in the supply piping, pulling downstream liquid into the potable system.
- Backpressure
- Backflow caused when downstream pressure exceeds supply pressure, forcing water backward through a cross-connection.
- Cross-connection
- Any actual or potential physical link between potable water and a source of contamination or pollution.
- Air gap
- Physical separation between the supply outlet and flood-level rim of at least twice the effective opening diameter, never less than one inch.
- RP assembly
- Reduced pressure principle assembly with two check valves and a differential relief valve, protecting against both backpressure and backsiphonage at health-hazard level.
- DCVA
- Double check valve assembly with two testable check valves, used for non-health pollution hazards against backpressure and backsiphonage.
- PVB
- Pressure vacuum breaker with a check valve and air inlet, installed above the highest downstream outlet and not used under backpressure.
- SVB
- Spill-resistant vacuum breaker with a loaded air-inlet valve that resists spitting and may be installed in pits where code allows.
- AVB
- Atmospheric vacuum breaker with a non-testable air inlet that opens at atmospheric pressure, not for continuous pressure or backpressure.
- Hose-bibb vacuum breaker
- Small non-testable device threaded onto a sill cock to prevent backsiphonage; not for continuous pressure or freezing service.
- Relief valve opening
- RP relief valve should open when the differential across check one drops to about 2 psi, indicating a failed check or fouled seat.
- Check one differential
- During an RP test, check one closing differential must hold at least 5 psi to pass the field test.
- Check two differential
- During an RP or DCVA test, check two closing differential must hold at least 1 psi to pass.
- PVB air-inlet test
- PVB air inlet must open at 1 psi or less of vacuum, and its check valve must hold at least 1 psi closing differential.
- Test kit calibration
- Differential pressure gauge test kits require periodic calibration, commonly annual, with certificates kept on file for inspection.
- Test report contents
- Report includes assembly make, model, size, serial, location, tester certification, date, supply pressure, readings, and pass or fail.
- RP relief discharge cause
- Continuous relief discharge usually indicates a fouled or leaking check one, damaged relief seat, or fluctuating supply pressure.
- Low check differential
- A low check differential commonly results from debris on the seat, a worn disc, or a weak spring; clean and rebuild.
- Post-repair retest
- After any repair or parts replacement, a complete field test is required before the assembly returns to service.
- Freeze damage
- Trapped water freezing in an assembly cracks bodies and seats; drain and protect RP relief and PVB air inlets in winter.
- Approved repair parts
- Only manufacturer-approved repair kits and elastomers may be used, preserving assembly certification and test performance.
- ASSE 5110
- Professional qualification standard for backflow prevention assembly testers, covering training, examination, and recertification.
- ASSE 5013
- Product standard covering reduced pressure principle backflow prevention assemblies used for health-hazard protection.
- AWWA M14
- Recommended practice manual for backflow prevention and cross-connection control, covering program design and assembly application.
- Annual testing rule
- Most jurisdictions require testable assemblies to be tested at least annually by a certified tester, with some high-hazard sites tested more often.
- Containment assembly
- Testable assembly installed at the service line to isolate the entire premises from the public water distribution system.
- Isolation assembly
- Testable assembly installed at a point of hazard inside a premises to protect the internal potable piping from a specific cross-connection.
- Hazard classification
- Premises rating based on risk: pollution (non-health) hazards generally allow DCVAs, while health hazards require RP assemblies or air gaps.
- Premises survey
- On-site evaluation of a facility to identify cross-connections, assign hazard class, and determine required assemblies and testing schedule.
- Tester certification
- Credential such as ASSE 5110 showing a tester has passed training and examination; recertification is commonly required every three years.
- Enforcement escalation
- Program process of notice, retest deadline, and possible water service termination for noncompliant assemblies, with appeal rights in the ordinance.