Cast Iron
Cast Iron is a traditional and highly respected material used in plumbing systems, especially for drain, waste, and vent pipes. It's known for being extremely durable and excellent at reducing noise from running water. When plumbers mention Cast Iron, they're typically referring to pipes or fittings that are used in both residential and commercial buildings. While modern materials like PVC are also common today, Cast Iron remains popular in many applications, especially in commercial buildings and high-rise structures where its sound-dampening qualities and fire resistance are valuable.
Examples in Resumes
Installed Cast Iron drainage systems in multi-story commercial buildings
Repaired and replaced Cast Iron pipes in historical building renovations
Supervised installation of Cast Iron waste stacks in apartment complexes
Typical job title: "Plumbers"
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Where to Find Plumbers
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Example Interview Questions
Master Plumber Level Questions
Q: What are the advantages and disadvantages of Cast Iron compared to PVC for commercial buildings?
Expected Answer: A master plumber should discuss sound dampening properties, fire resistance, longevity, cost differences, and installation requirements. They should also mention when each material is most appropriate.
Q: How do you properly size a Cast Iron drainage system for a multi-story building?
Expected Answer: Should explain load calculations, pipe sizing requirements, venting needs, and local code compliance. Should demonstrate knowledge of drainage fixture units (DFU) calculations.
Journeyman Level Questions
Q: What methods do you use to join Cast Iron pipes?
Expected Answer: Should describe hub-and-spigot connections, no-hub couplings, and proper tools needed. Should mention the importance of proper support and alignment.
Q: How do you identify when Cast Iron pipes need replacement?
Expected Answer: Should discuss signs of deterioration like cracks, rust spots, leaks, and using inspection tools. Should mention preventive maintenance approaches.
Apprentice Level Questions
Q: What safety equipment is needed when working with Cast Iron?
Expected Answer: Should list basic safety gear like gloves, safety glasses, steel-toe boots, and proper lifting techniques due to the heavy weight of Cast Iron.
Q: What are the basic tools needed for Cast Iron installation?
Expected Answer: Should mention snap cutters, measuring tools, level, support hangers, and joining tools. Should understand basic safety procedures.
Experience Level Indicators
Junior (0-2 years)
- Basic pipe cutting and measuring
- Understanding of plumbing codes
- Ability to identify different pipe materials
- Basic tool handling and safety procedures
Mid (2-5 years)
- Independent installation of Cast Iron systems
- Troubleshooting and repair
- Reading and interpreting blueprints
- Knowledge of building codes and permits
Senior (5+ years)
- Complex system design and installation
- Project management and supervision
- Advanced problem-solving
- Training and mentoring junior plumbers
Red Flags to Watch For
- No knowledge of proper support requirements for Cast Iron
- Unfamiliarity with local plumbing codes
- Lack of proper licensing or certification
- No experience with commercial installations
