CSLB C-36 Plumbing ContractorPlanning and EstimatingMedium
A plumbing contractor is estimating materials for a new residential drainage system. The plans specify the use of ABS pipe. Which of the following is a key characteristic of ABS pipe that influences its selection for drainage applications?
- AIt is highly resistant to UV degradation.
- BIt offers superior sound insulation compared to PVC.
- CIt requires solvent cement for all joints.
- DIt is suitable for hot water supply lines.
Show answer & explanationAnswer & explanation
Correct answer: C. It requires solvent cement for all joints.
ABS (Acrylonitrile Butadiene Styrene) pipe is commonly used for drainage, waste, and vent (DWV) systems. A defining characteristic is that its joints are formed using a single type of solvent cement, which chemically welds the pipe and fitting together.
Why the other options are wrong
- A. ABS pipe is susceptible to UV degradation and should not be exposed to direct sunlight for extended periods.
- B. While plastic pipes generally transmit less sound than metal, ABS does not inherently offer superior sound insulation compared to PVC; both can be noisy without proper insulation.
- D. ABS pipe is not typically rated or recommended for hot water supply lines due to temperature limitations.
ABS Pipe Characteristics
Properties of Acrylonitrile Butadiene Styrene (ABS) pipe, commonly used for DWV systems, including its joining method and limitations.
- Black in color.
- Joined with a single-step solvent cement (no primer needed).
- Used for drainage, waste, and vent (DWV) applications.
- Not suitable for pressure applications or direct sunlight exposure.
Memory trick: ABS is black, simple glue, DWV track.