1. Water distribution.

Question 0

1. Required capacity at fixture supply pipe outlets: flow rate in gpm and flow pressure in psi:
Bathtub, no shower - 
Bathtub with anti-scold protection - 
Bidet - 
Combination fixture - 
Dishwasher, residential - 
Drinking fountain - 
Laundry tray - 
Lavatory - 
Lavatory (self closing) - 
Lavatory (sensor) -
Shower - 
Shower, balanced-pressure, thermostatic or combination balanced-pressure/thermostatic mixing valve -
Sill-cock, hose bib - 
Sink, residential - 
Sink, service - 
Urinal, valve - 
Water closet, blow out, flushometer valve - 
Water closet, flushometer tank - 
Water closet, siphonic, flushometer valve - 
Water closet, tank, close coupled - 
Water closet, tank, one piece -

Answer 0

Bathtub, no shower - 4 gpm, 20 psi.
Bathtub with anti-scold protection - 4 gpm, 20 psi.
Bidet - 1.5 gpm, 20 psi.
Combination fixture - 4 gpm, 8 psi.
Dishwasher, residential - 2.75 gpm, 8 psi.
Drinking fountain - 0.75 gpm. 8psi.
Laundry tray - 4 gpm. 8psi.
Lavatory - 2 gpm, 8 psi.
Lavatory (self closing) - 2 gpm, 20 psi.
Lavatory (sensor) -2 gpm , 20 psi.
Shower - 3 gpm, 8 psi.
Shower, balanced-pressure, thermostatic or combination balanced-pressure/thermostatic mixing valve -3 gpm, 20 psi.
Sill-cock, hose bib - 5 gpm, 8 psi.
Sink, residential - 2.5 gpm, 8 psi.
Sink, service - 3 gpm, 8 psi.
Urinal, valve - 18 gpm, 20 psi.
Water closet, blow out, flushometer valve - 25 gpm. 25 psi.
Water closet, flushometer tank - 3 gpm, 20 psi.
Water closet, siphonic, flushometer valve - 25 gpm, 25 psi.
Water closet, tank, close coupled - 3 gpm, 15 psi.
Water closet, tank, one piece -3 gpm, 20 psi.

Question 1

2. Maximum flow rates and consumption for plumbing fixtures and fixtures fittings:
Lavatory, private - 
Lavatory, public, (self closing) - 
Shower head - 
Sink faucet -  
Urinal - 
Water closet -

Answer 1

Lavatory, private - 1.5 gpm at 60 psi.
Lavatory, public, (self closing) - 0.25 gallon per metering cycle.
Shower head - 2.0 gpm at 80 psi.
Sink faucet - 2.2 gpm at 60 psi.
Urinal - 0.5 gallon per flushing cycle.
Water closet -1.28 gallons per flushing cycle or equivalent dual flush

Question 2

3. Minimum sizes of fixture water supply pipes:
3/8" - 
1/2" - 
3/4" - 
1" -

Answer 2

3/8” - Water closet (flushometer tank), Water closet (flush tank), Lavatory, Drinking fountain, Bidet.
1/2” - Bathtubs, Combination sink and tray, Dishwasher (domestic), hose bibs, Kitchen sink; Laundry, 1,2 or 3 compartment,; Shower (single head). Sink (service), Urinal (flush tank), Urinal (flush valve), Wall hydrant.
3/4” - Sink flushing rim).
1” - Water closet flush valves).

Question 3

4. Manifold sizing (maximum demand in gpm at velocity 4 fps and 8 fps):
1/2" - 
3/4" - 
1" -
1-1/4" - 
1-1/2" -

Answer 3

1/2" - 2 - 5.
3/4" - 6 - 11.
1" - 10  - 20.
1-1/4" - 15 - 31.
1-1/2" - 22 - 44.

Question 4

5. Give an objection for oversized hot water supply pipelines that does not apply to cold water supply lines.

Answer 4

With oversized hot water piping, more water be drawn and washed before the hot water reaches the fixture.

Question 5

6. What method of heat transfer is used in a gravity domestic hot water circulation system?

Answer 5

Convention. Currents are created due to the difference in weight of water at different temperatures.

Question 6

8. Under what conditions may a flushing be required in connection with the installation of a water pipe?

Answer 6

A Water pipe running through a roof or deck for a hose connection would require a flushing. In some installations when exposed water pipes extend through a floor in a building, a flushing is required around the pipe at the floor line to prevent water from seeping to the floor below.

Question 7

9. Cold and hot water house piping system. (Roof tank).

Answer 7

See figure 20.

Question 8

10. Hydro pneumatic water system.

Answer 8

Se figure 19.

Question 9

11. Size of overflows for gravity and suction tanks.
    Overflow pipe size (inches) - Maximum allowable GPM for each orifice opening into tank - Maximum allowable GPM for vertical overflow (piping connecting orifices).

Answer 9

2 - 19 - 25
3 - 43 - 75
4 - 90 - 163
5 - 159 - 296
6 - 257 - 472
8 - 505 - 1,020
10 - 890 - 1,870
12 - 1,400 - 2,967

Question 10

12. Vent for roof tank?

Answer 10

The cover of gravity tanks shall be vented with a return bend vent pipe with an area not less than the area of the down-feed riser pipe, and the vent shall be screened with a corrosion-resestant screen of not less than 16 by 20 mesh per inch.

Question 12

13. Devices that shall be installed with pressure regulator?

Answer 12

1. Strainer required ahead of regulator.

2. Expansion tank required for regulator without integral bypass.

Question 13

14. How can You increase pressure coming from pressure regulator?

Answer 13

By turning the bolt further into the regulator.