Gas & FuelPregunta 73 de 110
A two-appliance system: appliance A needs 60 cfh and appliance B needs 40 cfh. Using the longest-length method, the section of pipe between the meter and the first tee carries what demand?
a.100 cfh
b.40 cfh
c.60 cfh
d.20 cfh
Explicación
The common section upstream of the first tee carries the sum of all downstream demand, 60 + 40 = 100 cfh, and is sized for that total at the system's longest length. Each branch downstream of the tee is then sized for only the appliance it serves. Undersizing the common section starves both appliances during simultaneous use.
Referencia Legal: IFGC §402.4Practica las 110 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- Each gas appliance must have an accessible manual shutoff. Where must the appliance shutoff valve be located?
- Using the known-air-infiltration method, an appliance space of 10,000 ft^3 is credited with 0.35 air changes per hour of natural infiltration. How many cubic feet of infiltration air per hour does the space provide?
- A gas appliance vent connector runs 12 ft horizontally to the chimney. Code requires a minimum upward rise of 1/4 in per foot toward the chimney. What total vertical rise must the connector have?
- A leak test on an in-service gas line uses a soap-bubble or electronic method rather than a pressure drop. When is the bubble/electronic leak check the appropriate method?
- An elevated industrial gas line operates at 5 psi and is regulated down for appliances rated in inches of water column. Using 1 psi = 27.7 in water column, what is 5 psi expressed in inches of water column?
- A natural-gas dryer needs 35,000 BTU/hr and a range needs 65,000 BTU/hr on a shared branch. Using 1,000 BTU/ft^3, what is the combined cfh the common branch must carry?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Master Plumber Licensing Exam (UPC/IPC-based) · Cómo revisamos