ASSE 6030 flashcards
ASSE 6030 · Build recall with a focused review session.
33 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Cross-connection
- Any actual or potential physical connection between a potable water supply and a source of nonpotable fluid or substance, allowing contamination to enter the drinking water system.
- Backflow
- The reverse flow of water or other substances into the distribution system of a public water supply from any source, caused by backsiphonage or backpressure.
- Backsiphonage
- Reverse flow caused by negative or subatmospheric pressure in the supply piping, which draws nonpotable fluid into the potable system through a cross-connection.
- Backpressure
- Reverse flow caused when downstream pressure exceeds the supply pressure, forcing nonpotable fluid back into the potable water system.
- Containment isolation
- Protection installed at the service connection to isolate an entire premises from the public water main, preventing backflow from the whole facility.
- Pollution versus contamination
- A pollution hazard degrades water quality without a health risk; a contamination hazard creates a health risk and requires the highest level of protection.
- Pressure and head formula
- Pressure in psi equals head in feet multiplied by 0.433, based on water weighing 62.4 pounds per cubic foot at standard conditions.
- Absolute pressure
- Absolute pressure equals gauge pressure plus atmospheric pressure, which is about 14.7 psi at sea level.
- Maximum theoretical lift
- A perfect vacuum equals 0 psia, so the maximum theoretical backsiphonage lift at sea level is about 33.9 feet of water.
- Static versus residual pressure
- Static pressure is measured with no flow; residual pressure is the pressure remaining while water is flowing through the system.
- Water hammer
- A pressure surge caused by a rapid change in water velocity, reduced by arrestors, slow-closing valves, and proper piping design.
- Air gap
- A physical separation between a potable outlet and the flood-level rim; it is the only non-mechanical method and provides the highest protection.
- Reduced-pressure assembly
- An assembly with two independently acting check valves and a hydraulically operating differential relief valve between them, used for health hazards.
- Double check valve assembly
- An assembly with two independently acting check valves and test cocks, used only for non-health hazards where backpressure is possible.
- Pressure vacuum breaker
- A device with a loaded check valve and loaded air inlet valve, installed above downstream piping and not subject to backpressure.
- Atmospheric vacuum breaker
- A device with an unloaded air inlet valve, limited to low-hazard applications not under continuous pressure, with no test cocks.
- Spill-resistant vacuum breaker
- A pressure vacuum breaker variant with a check valve that prevents spillage during normal operation and permits installation in pits with drainage.
- ASSE 1013
- The standard covering reduced-pressure principle backflow prevention assemblies, including requirements for design, performance, and testing.
- ASSE 1015
- The standard covering double check valve backflow prevention assemblies, used for non-health hazard applications where backpressure may occur.
- ASSE 1020
- The standard covering pressure vacuum breaker assemblies, which protect against backsiphonage only and must be installed above downstream piping.
- AWWA C511
- The AWWA standard covering reduced-pressure principle backflow prevention assemblies, complementing ASSE standards for water utility applications.
- Safe Drinking Water Act
- Federal law requiring public water systems to protect the distribution system from contamination, supported by regulations such as 40 CFR Part 141.
- Health hazard protection
- A health hazard requires an air gap or a reduced-pressure assembly, because these provide the highest level of protection against contamination.
- Non-health hazard protection
- A non-health hazard may be protected by a double check valve assembly, pressure vacuum breaker, or other approved device depending on conditions.
- Detector assembly use
- Detector assemblies on fire sprinkler systems detect unauthorized water use while protecting the supply from backflow.
- Air gap height rule
- The potable outlet must be at least twice the effective opening diameter above the flood-level rim, and never less than one inch.
- PVB installation height
- A pressure vacuum breaker must be installed at least 12 inches above the highest downstream piping or fixture, with local code governing exact height.
- AVB installation limits
- An atmospheric vacuum breaker must be installed at least 6 inches above the highest downstream piping and must not be under continuous pressure.
- RP assembly installation
- A reduced-pressure assembly must be installed horizontally with clearance for testing and repair, and must not be placed in a pit without drainage and access.
- RP test sequence
- Record supply pressure, check check valve one tightness, check relief valve opening point, check check valve two tightness, and record final readings.
- Relief valve opening point
- The relief valve must open at least 2 psi below the supply pressure, and the assembly must maintain the required differential between zones.
- Test gauge calibration
- Test gauges must be calibrated within the accuracy tolerance specified by the jurisdiction, and calibration dates must be recorded on test reports.
- Program records
- Records should include device location, make, model, size, serial number, installation date, test results, and tester identification for each assembly.