CPD Plumbing Systems Design 5

Question 1

Which standard governs the design and performance testing of thermostatic mixing valves used to limit domestic hot water delivery temperature?

Accepted Answer

ASSE 1017

Answer

ASSE 1017 covers thermostatic mixing valves for use on domestic hot water supply systems, establishing performance and temperature control requirements to prevent scalding.

Question 2

A designer is routing a natural gas line under a concrete slab. Which type of gas piping is permitted for this concealed underground application per the International Fuel Gas Code?

Accepted Answer

Yellow polyethylene (PE) gas pipe

Answer

Yellow polyethylene (PE) gas pipe is specifically designed and code-approved for underground gas service and distribution piping; it resists corrosion and soil stress.

Question 3

In designing a solar thermal domestic hot water system, what component prevents reverse thermosiphon flow from cooling stored water at night?

Accepted Answer

Check valve on collector supply line

Answer

A check valve installed on the collector supply line prevents reverse thermosiphon flow at night, when the collector is cooler than the storage tank and would otherwise drain heat back to the roof.

Question 4

Under the IPC, what is the maximum number of water closets that a single 4-inch horizontal branch drain may serve?

Accepted Answer

6

Answer

Per IPC Table 703.2, a 4-inch horizontal branch drain is permitted to serve a maximum of 6 water closets.

Question 5

Which seismic bracing standard is referenced by the IPC and IAPMO for plumbing system restraint requirements in seismic design categories C through F?

Accepted Answer

ASCE 7

Answer

ASCE 7 (Minimum Design Loads and Associated Criteria for Buildings and Other Structures) establishes seismic design categories and the lateral force requirements that plumbing bracing must satisfy.

(CPD) Certified Plumbing Designer Practice Test

(CPD) Certified Plumbing Designer Practice Test

CPD Plumbing Systems Design 5