NITC Master Plumber case studies

NITC Master Plumber · Put your knowledge to work in context.

The NITC Master Plumber credential is a professional certification administered through the National Inspection, Testing and Certification Corporation (NITC), an ASSE International affiliate. It is designed for experienced plumbing professionals who already hold journeyman-level credentials or can document substantial field experience and who want independent verification that they can design, install, and supervise plumbing systems to code. The NITC Master Plumber case studies are 5 cases and about 3,028 words.

Long Trap Arm and Undersized Branch in an Apartment Laundry Conversion

A three-story, six-unit apartment building is being converted from offices to residential use. On the ground floor, the contractor is adding a laundry room with three stacked washer/dryer units, each on a 2-inch standpipe and 2-inch P-trap, plus a new mop sink.

701 words, about 4 min 2

Fertilizer Injection, an Overdue RPZ, and a Missing Hose-Bibb Vacuum Breaker

A 12-acre wholesale nursery has a 4-inch municipal water service. The service enters a booster pump room and then feeds both the office/restroom and an irrigation system.

608 words, about 3 min 3

Closed-System Thermal Expansion and Third-Floor Temperature Swings in a Motel

A 40-unit motel has a 75-gallon commercial gas-fired water heater set at 140°F, a 1-inch copper hot-water supply, and a thermostatically controlled recirculation pump on a return loop. Last month the water utility installed a new 1-inch pressure-reducing valve at the service and a check valve at the meter; the incoming pressure was 105 psi and is now 55 psi.

630 words, about 3 min 4

Hydrostatic Test Failure on a 4-Inch PVC Building Drain

A plumbing contractor is testing a new 4-inch PVC underground sanitary building drain, 120 feet long with 1/8-inch-per-foot slope, serving a 24-unit apartment building. The line has 14 solvent-welded joints and two long-sweep 90s.

551 words, about 3 min 5

Change Order, Added Hose Bibbs, and a Three-Week Truss Delay

You are the master plumber for a 1.2 million, 24-unit, four-story wood-frame apartment project. Your plumbing subcontract is 286,000 with a 5% contingency and a 10-week schedule.

538 words, about 3 min