Journeyman Plumber ExamDrainage, Waste, and Venting (DWV) SystemsMedium
A plumber is installing a chemical waste system in a laboratory. Which of the following materials is most appropriate for the drainage piping in this application?
- ACast Iron
- BPVC (Polyvinyl Chloride)
- CBorosilicate Glass
- DCopper
Show answer & explanationAnswer & explanation
Correct answer: C. Borosilicate Glass
Borosilicate glass is highly resistant to a wide range of corrosive chemicals, making it the most appropriate material for laboratory chemical waste drainage systems where various aggressive chemicals might be discharged. PVC has limited chemical resistance, cast iron corrodes, and copper is reactive with many acids.
Why the other options are wrong
- A. Cast iron is prone to corrosion when exposed to many common laboratory acids and bases.
- B. PVC has good resistance to some chemicals but is not suitable for all laboratory chemical waste due to limitations with solvents and high temperatures.
- D. Copper reacts with many acids and is generally unsuitable for chemical waste drainage.
Chemical Waste Piping Materials
Specialized drainage piping materials are required for laboratory and industrial applications where corrosive or hazardous chemicals are discharged. Material selection depends on the specific chemicals anticipated.
- Resistant to corrosive chemicals.
- Common materials: borosilicate glass, polypropylene, PVDF.
- Not all plastics are suitable.
- Prevents leaks and environmental contamination.
Memory trick: For Lab Waste, Tough Material's Best, Putting Chemical Resistance to the Test.