Question 2003 of 229 · California Water Distribution Operator Exam
Back-pressure backflow occurs when:
Exactly one answer is correct.
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Correct answer to question 2003
- A: The pressure in the customer's system becomes higher than the supply pressure
Explanation
Pumps, boilers and elevated tanks on the customer side can push water backward into the public system. Check valves alone are not accepted protection for high hazards.
More questions: Distribution System Design and Hydraulics
- 2004Which backflow prevention method provides the highest level of protection?
- 2005Under the State Water Board's Cross-Connection Control Policy Handbook, what is the minimum vertical air-gap separation between the supply outlet and the flood level of the receiving vessel?
- 2006Which assembly is generally required to protect the public water supply from a high-hazard cross-connection that may see back-pressure?
- 2007A garden hose submerged in a bucket of fertilizer solution and connected to a hose bib is an example of what?
- 2008How often must testable backflow prevention assemblies be tested in California?
- 2009What is the water hammer?