Question

joining copper and galvanized steel piping together will produce corrosion unless a isolation hanger is used dielectric connector is used tempering valve is used mixing valve is used brass coupler is used question 30 1 pts what would the difference be in static pressure readings on a vertical pipe at zero elevation and a 20 - foot elevation? 0 psi 4.5 psi 9 psi 17 psi 20 psi

Explanation:

Question 1

When joining copper and galvanized - steel piping, a dielectric connector is used to prevent galvanic corrosion which occurs due to the electrochemical reaction between the two different metals. Other options do not serve this anti - corrosion purpose.

Step1: Recall pressure - elevation formula

The pressure change $\Delta P$ with elevation in a fluid column is given by $\Delta P=
ho gh$, where $
ho$ is the density of the fluid, $g$ is the acceleration due to gravity, and $h$ is the height. For water, the density $
ho = 62.4\ lb/ft^{3}$, $g = 32.2\ ft/s^{2}$. In terms of pressure per foot of water column, the pressure change per foot of water is approximately 0.433 psi/ft.

Step2: Calculate pressure difference

We want to find the pressure difference for a 20 - foot elevation change. Using the fact that the pressure change per foot is 0.433 psi/ft, we multiply by the height $h = 20$ ft. So $\Delta P=0.433\times20 = 8.66\approx9$ psi.

Answer:

B. dielectric connector is used

Question 2