ASSE 5140 case studies
ASSE 5140 · Put your knowledge to work in context.
ASSE 5140 is a multiple-choice certification examination for professionals who test and maintain backflow prevention assemblies protecting fire sprinkler systems. The work sits at the intersection of plumbing code, cross-connection control and life-safety system integrity: a competent tester recognises an acceptable installation, confirms that an assembly performs as required, and produces documentation a code official can defend without ambiguity. The ASSE 5140 case studies are 5 cases and about 3,049 words.
1Sprinkler Backflow Retrofit in a Metered Service
A three-story, 24-unit apartment building is converting a dry standpipe into a combined automatic wet sprinkler system. The domestic service is a 2-inch (50 mm) meter feeding a 1-1/2-inch copper main at 62 psi static; the fire line branches off downstream of the meter.
581 words, about 3 min2Stack Sizing and Venting in a Converted Loft
A warehouse is converted to a restaurant on the ground floor and a dwelling unit above. The existing 4-inch cast-iron soil stack serves two water closets, one floor drain, and a new kitchen sink on the ground floor; the upper floor adds a lavatory, a shower, and a clothes washer.
685 words, about 3 min3Water Heater Replacement and Thermal Expansion
A 40-gallon residential gas water heater fails and is replaced with a like-sized unit. The home has a pressure-reducing valve at the meter set to 55 psi, a closed system with a check valve at the meter, and no expansion tank.
583 words, about 3 min4Plan Review: Grease Interceptor and Fixture Count
A 90-seat restaurant submits plans with a 1,000-gallon exterior concrete grease interceptor, a 2-inch kitchen drain, and a 3-compartment sink with a 1-1/2-inch indirect waste. The plan shows the interceptor 60 feet from the building, with a 2-inch line at 1/8 inch per foot, two cleanouts, and a vent at the interceptor.
594 words, about 3 min5Inspection Dispute: Pressure Test Failure and Enforcement
A rough-in inspection fails because a 3-inch building drain held 10 feet of head for 15 minutes and lost pressure at the test plug. The contractor argues that the leak is at the plug, not the pipe, and that the code allows a 10-foot head test for 15 minutes, so the test was passed.
606 words, about 3 min