MEP Exam 4 Plumbing Questions Fully Solved Latest Update 2025
One of the first to place mold clay into pipe? - Answers Babylonia
John Snow - Answers First to investigate the relationship between water, waste and cholera
How did we found about cholera? - Answers John Snow investigated...he found that deaths were
clustered around the pump. Also the brewery had no deaths because they boiled the water to make the
beer.
Building Sewer Testing - Answers Insertion of a test plug at the point of connection with the public sewer
and filling the sewer with water, testing with no less than 10 ft of water and be able to maintain
pressure for 15 minutes
DWV Systems Water Test - Answers Section filled with water to minimum of 10 feet above the highest
fitting connection in that section or the highest point in the completed system. Water must hold in the
section under test for 15 minutes. If NO LEAKS you pass!
DWV Systems Air Test - Answers Portion under test maintained at a gauge pressure of 5 psi. Pressure
shall be held without introduction of additional air for a period of 15 minutes.
Finished Plumbing: Water tightness - Answers Each fixture filled and then drained. Traps and fixture
connections shall be proven water tight by visual inspection.
Finished Plumbing: Gas tightness 2 Test - Answers Smoke test and Peppermint test
Smoke test - Answers When smoke appears at vent terminals, terminals shall be sealed and a pressure
equivalent to a 1 inch water column applied and maintained for a test period of not less than 15
minutes.
Peppermint test - Answers Introduce 2 oz of oil of peppermint into the system. Add 10 qrtz of hot water
and seal all vent terminals. The odor of peppermint shall not be detected at any trap or other point in
the system.
Completion-Water supply system testing - Answers System will be tested under a water pressure of not
less than the working pressure of the system OR for piping systems other than plastic, by an air test of
not less than 50 psi. Held for not less than 15 min.
What does a trap do? - Answers Keeps gases out, keeps smell and insects out. You can reseal the trap by
pouring water.
What do backflow preventers do? - Answers Prevents drinking water from contamination, allow flow to
go only one direction. 2 backflow required at commercial.
Individual water supply and sewage disposal - Answers The water supply and DWV has to be connected
to a public water/sewer system if not available then an individual system shall be provided.
One of the first to place mold clay into pipe? - Answers Babylonia
John Snow - Answers First to investigate the relationship between water, waste and cholera
How did we found about cholera? - Answers John Snow investigated...he found that deaths were
clustered around the pump. Also the brewery had no deaths because they boiled the water to make the
beer.
Building Sewer Testing - Answers Insertion of a test plug at the point of connection with the public sewer
and filling the sewer with water, testing with no less than 10 ft of water and be able to maintain
pressure for 15 minutes
DWV Systems Water Test - Answers Section filled with water to minimum of 10 feet above the highest
fitting connection in that section or the highest point in the completed system. Water must hold in the
section under test for 15 minutes. If NO LEAKS you pass!
DWV Systems Air Test - Answers Portion under test maintained at a gauge pressure of 5 psi. Pressure
shall be held without introduction of additional air for a period of 15 minutes.
Finished Plumbing: Water tightness - Answers Each fixture filled and then drained. Traps and fixture
connections shall be proven water tight by visual inspection.
Finished Plumbing: Gas tightness 2 Test - Answers Smoke test and Peppermint test
Smoke test - Answers When smoke appears at vent terminals, terminals shall be sealed and a pressure
equivalent to a 1 inch water column applied and maintained for a test period of not less than 15
minutes.
Peppermint test - Answers Introduce 2 oz of oil of peppermint into the system. Add 10 qrtz of hot water
and seal all vent terminals. The odor of peppermint shall not be detected at any trap or other point in
the system.
Completion-Water supply system testing - Answers System will be tested under a water pressure of not
less than the working pressure of the system OR for piping systems other than plastic, by an air test of
not less than 50 psi. Held for not less than 15 min.
What does a trap do? - Answers Keeps gases out, keeps smell and insects out. You can reseal the trap by
pouring water.
What do backflow preventers do? - Answers Prevents drinking water from contamination, allow flow to
go only one direction. 2 backflow required at commercial.
Individual water supply and sewage disposal - Answers The water supply and DWV has to be connected
to a public water/sewer system if not available then an individual system shall be provided.
