PSI (Pounds per Square Inch)
PSI (Pounds per Square Inch) is a basic measurement of water pressure that plumbers use every day. Think of it like measuring how strongly water pushes against pipes and fixtures. Most home plumbing systems operate between 40-80 PSI, and plumbers need to check and adjust these levels to ensure everything works properly - from faucets running smoothly to preventing pipe damage. It's similar to checking tire pressure in a car, but for water systems. When you see PSI mentioned in a resume or job description, it usually relates to someone's experience with pressure testing, system diagnostics, or installation of pressure regulators.
Examples in Resumes
Performed pressure testing up to 100 PSI on residential and commercial plumbing systems
Installed and maintained pressure regulators to maintain proper PSI levels in building water systems
Diagnosed and resolved water pressure issues by conducting PSI measurements and adjustments
Typical job title: "Plumbers"
Also try searching for:
Where to Find Plumbers
Professional Organizations
Job Boards
Online Communities
Example Interview Questions
Senior Level Questions
Q: How do you determine the appropriate PSI range for different types of plumbing systems?
Expected Answer: A senior plumber should explain that residential systems typically need 40-80 PSI, commercial might require different ranges, and how to consider factors like building height, fixture requirements, and local codes when determining proper pressure ranges.
Q: What steps do you take when troubleshooting a building-wide pressure issue?
Expected Answer: Should describe a systematic approach: checking main pressure, testing at different points in the system, inspecting pressure regulators, looking for leaks or blockages, and considering peak usage times.
Mid Level Questions
Q: What are the signs of too high or too low PSI in a plumbing system?
Expected Answer: Should mention signs like banging pipes, weak water flow, burst pipes, or fixture damage, and explain how these relate to pressure problems.
Q: How do you adjust a pressure reducing valve to achieve proper PSI?
Expected Answer: Should be able to explain the process of adjusting the valve, testing pressure at various outlets, and ensuring stable pressure throughout the system.
Junior Level Questions
Q: What is the normal PSI range for a residential plumbing system?
Expected Answer: Should know that normal residential pressure ranges from 40-80 PSI, with 50-60 PSI being ideal for most homes.
Q: How do you use a pressure gauge to measure PSI?
Expected Answer: Should be able to explain basic steps of attaching a pressure gauge to a hose bib or other outlet and taking an accurate reading.
Experience Level Indicators
Junior (0-2 years)
- Basic pressure testing
- Reading pressure gauges
- Understanding normal PSI ranges
- Basic pressure regulator maintenance
Mid (2-5 years)
- Pressure reducer valve installation
- System-wide pressure testing
- Troubleshooting pressure issues
- Pressure system maintenance
Senior (5+ years)
- Complex system pressure design
- Commercial pressure system management
- Training others on pressure testing
- Advanced troubleshooting
Red Flags to Watch For
- Unable to explain basic pressure measurements
- No experience with pressure testing equipment
- Lack of knowledge about safe pressure ranges
- No understanding of pressure regulation systems
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