Which statement correctly contrasts installation handling for PVC and ductile iron pipe?

Which statement correctly contrasts installation handling for PVC and ductile iron pipe?

• A. PVC is lighter and uses solvent-glued joints; ductile iron is heavier and uses mechanical joints with gaskets and restraints.
• B. PVC and ductile iron are installed identically.
• C. PVC uses threaded joints; ductile iron uses solvent-welded joints.
• D. PVC is heavier and uses mechanical joints; ductile iron is lighter and uses solvent-glued joints.

Answer: (C)

Understanding how joints are made for PVC versus ductile iron pipes guides how you handle and install them. The statement that PVC uses threaded joints while ductile iron uses solvent-welded joints provides the clearest contrast between the two materials, which is why it’s the best choice here. This contrast affects the installation sequence: threaded joints require threading and tightening, while solvent-welded joints require surface preparation, priming, adhesive application, and a curing period before the joint is ready for service. The other options either imply the two materials are installed the same way or assign joint methods in a way that doesn’t align with the typical contrasting practices covered in this topic.

Understanding how joints are made for PVC versus ductile iron pipes guides how you handle and install them. The statement that PVC uses threaded joints while ductile iron uses solvent-welded joints provides the clearest contrast between the two materials, which is why it’s the best choice here. This contrast affects the installation sequence: threaded joints require threading and tightening, while solvent-welded joints require surface preparation, priming, adhesive application, and a curing period before the joint is ready for service. The other options either imply the two materials are installed the same way or assign joint methods in a way that doesn’t align with the typical contrasting practices covered in this topic.