Main Line
A main line in plumbing refers to the primary pipe that connects a building's plumbing system to the city's water supply or sewer system. It's like the highway of plumbing - the largest and most important pipe that brings water into a building (water main) or takes waste water away (sewer main). When plumbers talk about main line work, they're typically referring to jobs involving these critical pipes that require specialized skills and often heavy equipment. This is different from regular household plumbing like fixing sinks or toilets, as it involves working with larger pipes and often requires permits and coordination with local authorities.
Examples in Resumes
Supervised Main Line replacement projects for residential complexes
Diagnosed and repaired Main Line blockages using modern equipment
Led team of 4 plumbers in Main Line and Sewer Main installations
Typical job title: "Main Line Plumbers"
Also try searching for:
Where to Find Main Line Plumbers
Professional Organizations
Job Boards
Online Communities
Example Interview Questions
Senior Level Questions
Q: How do you handle a main line replacement project from start to finish?
Expected Answer: A senior plumber should explain the process including: initial inspection, obtaining permits, coordinating with utility companies, managing excavation, ensuring proper slope and materials, testing, and final inspection. They should also mention customer communication and team management.
Q: What factors do you consider when choosing between repairing or replacing a main line?
Expected Answer: Should discuss age of pipe, material type, extent of damage, cost comparison, property layout, local regulations, and long-term solutions vs. short-term fixes. Should also mention considering customer budget and future development plans.
Mid Level Questions
Q: What methods do you use to locate a main line blockage?
Expected Answer: Should mention using camera inspection equipment, locating tools, dye testing, and understanding common problem areas. Should also discuss signs that indicate blockage location.
Q: How do you determine the appropriate size for a main line replacement?
Expected Answer: Should explain considering building size, number of fixtures, local code requirements, and future expansion needs. Should also mention consulting building plans and local water authority requirements.
Junior Level Questions
Q: What are the common signs of a main line problem?
Expected Answer: Should identify basic symptoms like multiple backed-up fixtures, gurgling sounds, slow drains throughout the house, and sewage odors. Should also mention when to call for senior support.
Q: What safety precautions do you take when working on main lines?
Expected Answer: Should discuss basic safety measures like checking for other utilities, proper trench shoring, confined space procedures, and using personal protective equipment.
Experience Level Indicators
Junior (0-2 years)
- Basic main line cleaning and maintenance
- Using inspection cameras and basic diagnostic tools
- Understanding local plumbing codes
- Assisting with main line repairs
Mid (2-5 years)
- Main line repair and replacement
- Operating heavy equipment
- Reading and understanding building plans
- Troubleshooting complex blockages
Senior (5+ years)
- Project management for large main line jobs
- Training and supervising teams
- Complex problem-solving and diagnostics
- Emergency main line repairs
Red Flags to Watch For
- No experience with camera inspection equipment
- Unfamiliarity with local plumbing codes
- Lack of proper licensing and certifications
- No experience with large-diameter pipes
- Poor knowledge of safety procedures for deep excavation
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