2.2

Question 1

___________________

Water pressure from the ________________ is relied to drive water flow through the system

Water pressure in building water supply mains typically ranges from _____ to ____ psi (275 to 550 kPa), with 80 psi(550 kPa) considered the upper limit for most systems plumbed with ______ pipe and 40 psi the upper limit for ______ pipe. This available pressure places limits on how far water can be driven upward in a plumbing system.

Answer 1

UPFEED (UPFLOW SYSTEM)
water supply main, 40 - 80, metal, plastic

Question 2

______________________

Water is pumped to elevated storage tanks in, or on, thebuilding, and the water is fed down into the building by __________.This system feeds from the upper stories to the lower.

Water entering the building flows through pumps that develop sufficient water pressure to drive water to storage tanks serving zones of about ___ floors each. To develop adequate pressure, the storage tanks are placed above the zones that they serve.

Answer 2

DOWNFEED (DOWNFLOW SYSTEM)

gravity, 10

Question 3

__________ is the force exerted by water in a plumbing system

Answer 3

water pressure

Question 4

what are the three factors affecting water pressure

Answer 4

1. Elevation
2. Pipe Size
3. Flow Rate

Question 5

what pressure is when no water is flowing

Answer 5

static pressure

Question 6

example 1;
A PLUMBING FIXTURE OUTLET IS 24 FT ABOVE THE WATER SERVICE LINE.PRESSURE AVAILABLE AT THE WATER SERVICE IS 45 PSI.

Answer 6

34.6 psi is available at fixture outlet

Question 7

______________ is related to water flow rate,velocity,and nominal pipe diameter. Roughness of the inner walls of a pipes in fluences friction loss; Pressure drop for a particular rough pipe diameter is greater than in a smooth pipe having the same inside diameter.

Answer 7

pressure drop

Question 8

In plumbing water supply piping, the maximum water velocity is typically restricted to _____ to ____ ft/s

Answer 8

5 - 10

Question 10

For equipment feed lines in mechanical rooms where NOISE LEVELS are less of a concern, maximum velocities up to ____ ft/s are permitted.

Answer 10

15

Question 11

maximum safe velocity for thermoplastic pipe is about ___ ft/s

Answer 11

5

Question 12

This happens when a liquid undergoes a sharp drop in pressure, causing the liquid to vaporize into tiny vapor bubbles

Answer 12

cavitation

Question 13

In cavitation, a 1 ft^3 of water at room temperature becomes _______ ft^3 of vapor at the same temperature, ________ then implode as the vapor changes phase back to a liquid.

Answer 13

1600, bubbles

Question 14

This is an inadequate pipe connection that may allow non-potable water to get into the potable water system.

Answer 14

cross - connections

Question 15

AMERICAN WATERWORKS ASSOCIATION (AWWA) ESTIMATESOVER ____________ CROSSCONNECTIONS EACHDAY

Answer 15

100 000

Question 16

The vertical distance through an open air between an opening in a faucet conveying potable water to the flood level rim of a tank

Answer 16

air gap

Question 18

Minimum air gaps for cross connection protection for fixtures against one wall:

Lavatory ____ in
Sink ___ in
Laundry tray ___ in
Bath tub ___ in

Answer 18

1
1.5
1.5
2

Question 19

It is water flowing in the opposite direction from normal flow

Answer 19

backflow

Question 20

backflow caused by a negative pressure (vacuum) in a potable water system

Answer 20

backpressure or back siphoning

Question 21

caused by a down stream pressure that is greater than the supply pressure

Answer 21

backpressure backflow

Question 22

a device or plumbingassembly that when properlyinstalled in a plumbingsystem prevents backflow

Answer 22

vacuum breaker

Question 23

contains a spring loaded poppet, must be instaled on the main line leading to the control valves

Answer 23

pressure vacuum breaker (PVB)

Question 24

consists of two check valves assembled in series usually with a ball valve or gate valve installed at each end for isolation and testing

Answer 24

double check assembly (DCA)