CPD Water Supply & Distribution Systems 2

Question 1

What is the minimum water pressure required at the point of use for most plumbing fixtures per the Uniform Plumbing Code?

Accepted Answer

20 psi

Answer

The Uniform Plumbing Code requires a minimum of 20 psi at the point of use for most fixtures to ensure adequate flow.

Question 2

Which type of pipe material is most resistant to dezincification in water supply systems?

Accepted Answer

Dezincification-resistant (DZR) brass

Answer

DZR brass alloys are specifically formulated with inhibitors to resist dezincification in aggressive water conditions.

Question 3

In a zone-pressure distribution system for a tall building, what is the typical maximum zone height to limit static pressure?

Accepted Answer

10 floors

Answer

Zones are typically limited to approximately 10 floors (about 100 ft) to keep static pressure within acceptable limits of around 45 psi.

Question 4

What ASTM standard covers copper water tube Type L used in plumbing systems?

Accepted Answer

ASTM B88

Answer

ASTM B88 is the standard specification for seamless copper water tube, covering Types K, L, and M.

Question 5

Which method is used to calculate the design flow rate in a water distribution system based on fixture unit values?

Accepted Answer

Hunter's curve method

Answer

Hunter's curve (Hunter's method) converts water supply fixture units (WSFU) into probable simultaneous flow rates (gpm).

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