Backflow Study guides, Class notes & Summaries

All the following are required parts of an atmospheric vacuum breaker (asse1001) except a Air inlet float valve The body Air canopy Shutoff valve - Answer-Shutoff valve A single check valve for a backflow prevention is acceptable For low hazard For non-hazard residential applications On boilers only Never - Answer-Never The following absolute pressure could cause backsiphonage to occur in a hydraulic system (distribution system) at sea level 10.5 psia 15.0 p...

1. Backflow is defined as: a) the pressure in the distribution piping of the potable water supply b) the undesirable reversal of water, other liquids, gases or substances in the distribution pipes of the potable water supply c) high pressure in the pipes of the water user d) excess pressure through a pressure regulator - Answer-b) the undesirable reversal of water, other liquids, gases or substances in the distribution pipes of the potable water supply 2. Primary responsibility for cr...

1. The Safe Drinking Act places the responsibility for safe water upon the: a. Building Official b. Water purveyor c. Water user d. Health Department - Answer-b. Water Purveyor 2. Two things must be present for backflow to occur: a. Link and force b. Direct and indirect c. Pressure and Siphonage d. Backpressure and elevation - Answer-a. link and force A column of water 100 feet in height will produce how much pressure at its base. a. 231 psi b. 33.9 psi c. 43.3 psi d. 2.31 ps...

A double check valve assembly is installed 12 above the floor for? - Answer-Maintenance A low hazard Backflow preventer is a? - Answer-Double Check valve assembly A field test report for a double check will include the manufacturer name, model, size and ?? - Answer-Serial number Double check valve assembly components are?? - Answer-Independently acting A double check valve assembly hydraulic use is?? - Answer-Continuous A detector assembly contains a device of equal? - Answer-Prot...

When testing that air inlet in a pressure vacuum breaker, the bleed valve assembly for shut off valve leakage is installed on: - Answer-(B) The number 1test cock. When testing the air inlet and a pressure vacuum breaker, if the high side believe needle valve must be open more than a quarter turn, to indicates: - Answer-(C) A leaking number 1 shut off valve. When testing the air inlet and in a pressure vacuum breaker, if the high side bleed needle valve is open 1/4 turn and gage drops to ze...

Double Check Valve Assembly - Answer-A testable mechanical device consisting of two independently operating, spring-loaded check valves, four test cocks, and two full port shut off valves the purpose of an ASSE 1018 trap primer is to - Answer-maintain a trap seal a laboratory faucet vacuum breaker must contain - Answer-two independently acting check valves ASSE 1060 - Answer-outdoor enclosures standard, freeze protective enclosures must provide protection to a remedies of -30 f devic...

1) Backflow is the undesirable reversal of flow of water or other substances through a cross connection into the public water system or consumer's: - Answer-C. Public water system or consumer's portable water system 2) An approved airgap (AG) is a physical separation between the free-flowing end of a: - Answer-D. Potable water supply pipe line in the overflow rim of an open or non-pressurized receiving vessel 3) And indirect cross-connection is one that is subject to what type of backflo...

What is the pressure at the base of a 100 foot high standpipe filled with water? - Answer-43.3 psi A column of water exerts pressure at the bottom of a column due to - Answer-Weight of the water What is the primary consideration when deciding whether to install a reduced pressure or a double valve assembly? - Answer-Degree of hazard A cross-connection is an actual or potential connection that could allow backflow to occur between a potable water system and a piping system that contains ...

While field testing the check valve of a pressure vacuum breaker, water continues to flow from the # 2 test cock . How do you proceed ? - Answer-Open the bleed off valve until the flow slows to a slight drip. Well field testing the first check valve of a double check valve assembly, water continues to flow from the site tube. How do you proceed? - Answer-Observe reading on gauge (first step). Open high side of bleed valve (second step). While field testing the check valve of a spill resist...

Backflow exam review questions and rationale answers 2024