Journeyman Plumber ExamDrainage, Waste, and Venting (DWV) SystemsHard
A medical clinic requires a special waste system for laboratory drains that will carry corrosive chemicals. Which of the following piping materials is most suitable for this application?
- ABorosilicate glass
- BPVC (Polyvinyl Chloride)
- CCast iron
- DCopper
Show answer & explanationAnswer & explanation
Correct answer: A. Borosilicate glass
Borosilicate glass is highly resistant to a wide range of corrosive chemicals and high temperatures, making it the most suitable and preferred material for laboratory special waste systems.
Why the other options are wrong
- B. PVC has good chemical resistance to many common chemicals but can be attacked by certain solvents and high temperatures, making it less ideal for diverse lab waste.
- C. Cast iron is generally resistant to some chemicals but can corrode quickly with strong acids or bases.
- D. Copper is highly susceptible to corrosion from many common laboratory chemicals, especially acids.
Chemical Waste Piping Material
Specialized piping material used to convey corrosive, hazardous, or high-temperature waste from laboratory or industrial processes.
- Must resist chemical attack and degradation.
- Temperature resistance is often a factor.
- Common materials include borosilicate glass, polypropylene, and specific alloys.
Memory trick: Corrosive Chemical Conduits Choose Carefully.