PLTW Activity 2.3.8 Residential Water Supply

Calculate the static head at the point of discharge under 10th Street excluding head loss.

DO NOT ROUND ANSWER. DO NOT INCLUDE UNITS.

Calculate the head loss, including the losses for pipe fittings.

ROUND THIS ANSWER TO THE NEAREST WHOLE FOOT. DO NOT INCLUDE UNITS IN YOUR ANSWER.

Calculate the dynamic head at the point of discharge under 10th Street.

DO NOT ROUND THIS ANSWER. DO NOT INCLUDE UNITS IN YOUR ANSWER.

Calculate the actual pressure in front of the house.

ROUND THE ANSWER TO THE NEAREST TENTH. DO NOT INCLUDE UNITS IN YOUR ANSWER.

The actual pressure ​ (a)   sufficient for residential use. A pressure-reducing valve (b)   .

• is
• is not required
• not
• is required

Find the total dynamic head at the water meter of this facility.

ROUND TO THE NEAREST FOOT. DO NOT INCLUDE UNITS.

Find the total head loss at the water meter of this facility.

ROUND TO THE NEAREST FOOT. DO NOT INCLUDE UNITS.

Find the actual pressure at the water meter of this facility.

ROUND TO THE NEAREST FOOT. DO NOT INCLUDE UNITS.

What is the static head at a sink on the second floor if the sink faucet elevation is 14 feet above the meter elevation? Hint: Static head depends only on elevation.

ROUND TO THE NEAREST FOOT. DO NOT INCLUDE UNITS.

The water supply line from the meter to the house and up to the second-floor sink is a 1-inch copper pipe with screwed fittings. If the pipe from the meter to the second floor is a total of 75 feet long and includes four line flow tees, a swing check valve, and seven regular 90-degree elbows, calculate the actual pressure at the sink. Assume a flow rate of 10 gpm.

Hint: The actual pressure at the sink is affected by the head loss from the water tower to the sink (which included head loss from the tower to the meter and from the meter to the sink).

ROUND TO THE NEAREST WHOLE NUMBER. DO NOT INCLUDE UNITS