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70 Cards in this Set
- Front
- Back
- 3rd side (hint)
Velocity |
Rate at which water flows |
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Pressure |
Force exerted to walls of pipe |
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What effect does unreamed pipe have on the flow of water in a pipe? |
Turbulence |
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When does water hammer occur |
When water is forced to change direction or suddenly stop |
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3 way to prevent water hammer? |
1)shock absorber 2) air chambers 3) open valves slowly |
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4 causes of water hammer? |
1)Opening/closing valves too quick 2) temperature change 3) change in direction of pipe 4) water stopping too quickly |
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How do you recharge an air chamber? |
Drain system and refill |
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5 things must be known in order to size water supply? |
1) pressure at water supply 2) min. Static pressure at property line 3) maximum pressure at highest point 4) total developed length of water supply 5) length of distribution pipe (building supply-furthest fixture |
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Min. Working pressure at a fixture? |
Manufacturer spec.s |
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Max working pressure at a fixture? |
550 kPa |
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When sizing multiple wc with direct flush valves. Where is the largest value? |
Furthest fixture |
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Min air gap on a lav? |
1" |
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How must water supply to a lab sink be protected from backflow? |
Air gap |
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Term used to describe the water piping inside a building? |
Distribution piping |
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What is the min size of water metre? |
5/8" |
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What does water meter do? |
Monitor and record water consumption |
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What meter is most commonly used? |
Positive displacement |
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What is the primary use of a turbine meter? |
Industrial use and large flow volume |
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Do water meters have to be electronically grounded? |
Yes to prevent injury on person working on it. |
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How far must a meter be from any entrance, wall, or grade wall? |
12" |
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For a 5/8" water meter how much space is needed between adapters? |
12" |
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How many valves needed build bypass? |
3 |
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What type of valves on bypass? |
Full port valves - gate and ball |
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How do you prevent water condensation on water lines? |
Insulation |
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What causes condinsation on water lines |
Humidity condensing on the surface of cold pipe (water continues to move) |
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Can public water system be connected to private system? |
No |
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Provisions shall be made to protect water distribution from adverse effects of? |
Water hammer |
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A newly installed part of potable water distribution system shall be ________before the system is used? |
Flushed |
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A newly installed part of potable water distribution system shall be ________before the system is used? |
1) recirc pump 2) heat tracing |
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Name 2 types of methods of water distribution?
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1) gravity fed 2) pressure and forced |
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.433psi |
1 ft high of water |
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1 psi is equal to how many ft of water? |
2.31' |
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How long should water supply hold under pressure testing? |
0 minutes at max working pressure |
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Air min pressure test? |
700 kPa for 120 minutes |
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Chart for sizing urinals? |
2.6.3.2.B |
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Chart used for wc flush valves? |
2.6.3.2.C |
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Name 4 things you need to size booster pump? |
1) needs of building 2) number of FU 3)height of building 4) flow rate needed |
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For every metre there is____ lost? |
10 kPa |
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2 reasons for installing control valves on cold supply to HWT |
1)Isolation 2)service |
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What is the purpose of the sacrificial anode |
Reduce corosion due electrolysis |
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Why are gas and electrical tanks heavily insulated? |
Min heat loss |
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Coating applied to steel HWT to prevent corosion |
Galvanized, glass or stone lining |
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Why is PRV valve required on HWT? |
Prevent tank from exploding when water gets too hot and flashes to steam |
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4 Advantage of electric HWT? |
1)quiet 2)no venting 3)more choice in location 4)no energy lost in transfer of heat |
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2 types of gas HWT? |
1)direct fire 2) instantaneous |
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How is the cold water directed in a HWT to the bottom? |
Dip tube |
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What is inserted into the flue for better heat transfer from flue gases in a gas HWT? |
Helix type baffle |
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Advantage of instantaneous HWT?1 |
No storage and no heat loss |
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Advantage of gas fired HWT? |
Better recovery |
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4 areas domestic HWT needs to meet code? |
1)shut off 2)T&P within 6" top of tank 3)T&P needs to be certified 4) has to have gas valve (device shutoff the electricity of gas when reaches desired temp) |
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What size does discharge pipe from T&P valve be? |
Same as inlet |
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Where should outlet terminate? |
12" above floor |
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Can you alter T&P valve? |
No |
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Device that prevents HWT from exploding? |
T&P valve |
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Define thermal lag on water supply line? |
Slow timing for HW to reach fixtures |
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What can be done to prevent T&P valve from liming up? |
Install in vertical position and use plastic coated sensing element |
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What Temperature do fusible plugs melt? |
210°F |
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How should T&P valve be sized? |
By input burner rating |
BTU |
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In commercial HWT installed on horizontal it must be on metal masonry stand ____-_____ from the floor to bottom of tank. |
4'-6' |
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What is the 4 factors when deciding method of install for HWT? |
1)volume 2)space required 3)existing structures (power and chimney) 4) delivery of HW to furthest fixture |
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What does the dip tube have if cold supply is on top of tank? |
Small hole called anti-siphon |
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Temperature rises to 210°F what happens? |
The sensing element activates relief valve |
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Warm setting on HWT? |
120°F |
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Normal temperature setting on HWT? |
140°F |
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Hot temperature setting on HWT? |
160°F |
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How valves on bypass? |
1 |
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T and p relief valve temp storage water tank cant exceed? |
99°C / 210°F |
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Water supply size to a flush tank urinal? |
3/8" |
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_____water piping shall be identified by markings that are permanent distinct and recognized? |
Non potable |
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In an apartment building with private use is the laundry room public or private? |
Private |
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