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 for all non-pressure sanitary drainage, waste, and vent (DWV) applications. Which of the following is a primary characteristic of ABS pipe that makes it a popular choice for these applications?
- AFlexibility for bending around obstacles
- BSingle-solvent cement joining process
- CExcellent resistance to ultraviolet (UV) degradation
- DHigh resistance to extreme temperatures (above 180°F)
Show answer & explanationAnswer & explanation
Correct answer: B. Single-solvent cement joining process
One of the key advantages and primary characteristics of ABS (Acrylonitrile Butadiene Styrene) pipe for DWV applications is its single-solvent cement joining process. Unlike PVC, which often requires a primer and then cement, ABS typically uses a single, simpler solvent cement for strong, reliable connections.
Why the other options are wrong
- A. While somewhat flexible, ABS is not designed for significant bending; fittings are used for changes in direction.
- C. ABS pipe is susceptible to UV degradation and typically requires protection from direct sunlight.
- D. ABS has a lower temperature limit (typically 180°F) compared to some other plastics.
ABS Pipe Characteristics
Acrylonitrile Butadiene Styrene (ABS) pipe is a rigid thermoplastic used primarily for non-pressure drainage, waste, and vent (DWV) systems, known for its ease of installation with a single-solvent cement.
- Commonly used for DWV in residential and light commercial.
- Joined using a single-step solvent cementing process.
- Not suitable for hot water supply or outdoor exposure to UV without protection.
Memory trick: ABS: 'A' for 'All-in-one' cement, 'B' for 'Black' pipe, 'S' for 'Sanitary' drains.