Master Plumber case studies
Master Plumber · Put your knowledge to work in context.
A Master Plumber license is the highest tier of plumbing credential issued by a state or local licensing authority, and it authorizes the holder to design and install plumbing systems, pull permits, supervise journeyman plumbers, and in many jurisdictions own or qualify a plumbing contracting business. Candidates typically qualify by documented years of journeyman-level field experience before they are even admitted to the exam, so the test assumes you already know how to run pipe and set fixtures - it measures whether you can reason from the code, size and lay out systems, and take responsibility for work you did not personally perform. The Master Plumber case studies are 5 cases and about 3,582 words.
1Hall Bath Rough-In: Trap Arm and Vent Termination
A one-story ranch is being remodeled. In the new hall bath, the installer runs a 3-inch horizontal branch at 1/4 in/ft from the existing stack: the water closet connects at the upstream end, the shower ties in 2 ft downstream of it, and the lavatory is the last fixture on the run.
698 words, about 3 min2Closed System, New PRV, and a Dripping T&P Valve
A two-story house with 8-ft ceilings and a second-floor shower head 18 ft above the basement main has 108 psi static pressure at the front hose bibb in the early morning. The service is 3/4-inch copper, 65 ft developed length to the meter.
770 words, about 4 min3Mixed-Use Building: Containment and Point-of-Use Backflow Protection
A four-story mixed-use building connects to the municipal main through a 2-inch service. The ground floor houses a dental clinic with two operatories, a wet-vacuum pump, and an amalgam separator; floors two through four are offices with pantry sinks; the basement has a gas-fired boiler with a chemical feed pot and a wet-pipe fire sprinkler riser; the loading dock has a hose bibb; and the site has a six-zone irrigation system with a fertilizer injector.
634 words, about 3 min4Adding a 199,000 BTU/h Tankless Heater to an Existing Gas System
A ranch house is served by a 7 in. (1/2 psi) natural gas system.
753 words, about 4 min5Garage Water Heater Replacement: T&P Discharge and Ignition Hazards
A 50-gallon atmospheric gas water heater is replaced in an attached garage in a climate with a design low of -5 F. The new heater is set directly on the slab next to the furnace.
727 words, about 4 min