What are the two basic tests a sewer?

What are the two basic tests a sewer?

• A. Pressure and Alignment
• B. Air and Water
• C. Leakage and Flow
• D. Exfiltration and Infiltration

Answer: (A)

Two basic tests used to verify a new sewer line before backfilling are the air test and the water test. The air test fills the installed pipe with air and monitors pressure over time; if the pressure holds with only allowable loss, the joints and segments are considered tight. The water test fills the line with water and checks for a drop in water level (or maintains a specified pressure) over a set period; because water is incompressible, even small leaks will show as a measurable loss, revealing leaks at joints, cracks, or defective seals. These tests are fundamental because they directly assess the integrity of the pipe and joints, ensuring the sewer will hold effluent without infiltration or exfiltration after construction. The other options describe outcomes or unrelated aspects rather than testing methods: alignment is a geometric check, leakage and flow describe results rather than the standard diagnostic tests, and exfiltration and infiltration refer to modes of leakage rather than test methods.

Two basic tests used to verify a new sewer line before backfilling are the air test and the water test. The air test fills the installed pipe with air and monitors pressure over time; if the pressure holds with only allowable loss, the joints and segments are considered tight. The water test fills the line with water and checks for a drop in water level (or maintains a specified pressure) over a set period; because water is incompressible, even small leaks will show as a measurable loss, revealing leaks at joints, cracks, or defective seals. These tests are fundamental because they directly assess the integrity of the pipe and joints, ensuring the sewer will hold effluent without infiltration or exfiltration after construction. The other options describe outcomes or unrelated aspects rather than testing methods: alignment is a geometric check, leakage and flow describe results rather than the standard diagnostic tests, and exfiltration and infiltration refer to modes of leakage rather than test methods.