Massachusetts Plumbers Journeyman Practice Exam

What size of solids should be prevented from passing into the drainage system in commercial laundries?

1. 1 inch

2. 2 inches

3. 3 inches

4. 4 inches

The correct answer is: 4 inches

The recommended prevention of solids passing into the drainage system in commercial laundries is 4 inches. This size is established to effectively avoid blockages and operational challenges within the plumbing system. Commercial laundries process a large volume of fabrics, which can include various types of debris such as lint, tangled threads, and other materials that can accumulate over time. By preventing solids larger than 4 inches from entering the drainage system, the risk of clogs and disruptions in wastewater flow is significantly reduced. This standard is vital for maintaining the efficiency of the drainage system and prolonging its lifespan, while also ensuring compliance with plumbing codes and regulations which aim to safeguard the overall hygiene and functionality of the facility.