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35 Cards in this Set
- Front
- Back
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Define velocity |
Rate which fluid flows |
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Define pressure |
Force exerted on walls of pipe |
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How does in reamed pipe effect flow |
Causes turbulance |
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3 ways to prevent water hammer |
Shock absorbers, open valves slowly, air chambers |
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4 causes of water hammer |
Quick closing valves, sudden changes of direction, temp diff in fluids, water stopping suddenly |
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Min working pressure at fixture |
Manufacturers specs |
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Max working pressure to a fixture |
550 kpa or 80 psi |
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What table would you use to find fixture units for a urinal with a direct flush? |
Sizing of water distribution systems for urinals |
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When sizing multiple wcs with direct flush valves does furthest water closet have smallest or biggest load |
Largest load |
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What is the min air gap on a lavaratory |
1 inch, 25 mm |
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How must water supply to lab sinks be protected from back flow |
Back flow preventer |
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How to find hydraulic load for commercial dishwasher |
Manufacturers instructions |
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Hydraulic load for 1/2 hose wye |
Same as hose bibb |
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Min supply to WC flush valve |
1 inch |
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Term used for water piping in building |
Distribution pipe |
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Min size of water meter |
5/8 |
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What does water meter do |
Records volume of flow |
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Which is the most common type of meter? |
Positive displacement |
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What is the primary use of a turbine meter? |
Used as a metering device for large flow volume |
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Do water meters have to be accessible |
Yes, for service |
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Why do meters have to be grounded? |
To prevent injury to worker working on it |
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How far must meter be away from any entrance, or wall |
12 inches |
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For a 5/8 water meter how much space is needed between adapters |
12 inches |
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How many valves are needed for a bypass? |
Three |
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What type of valves can be used on by pass? |
Full port gate valves or ball valves |
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What's installed on domestic water lines to prevent condensation |
Insulation |
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What causes condensation on water lines? |
Humidity condensing on pipe surface |
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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 system from |
Water hammer |
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A newly installed part of potable water system must be ______ before system is installed |
Cleaned |
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2 methods of maintaining temp. In hot waterline over 30 meters |
Re circulation, self regulating heat trace system |
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When is recirc req? |
When hot water distribution system has a developed length over 30m or is more than 4 stories high |
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The newest and most commonly used water meter is |
The positive displacement meter |
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The newest and most commonly used water meter is |
The positive displacement meter |
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How does positive displacement meter work |
Water enters through strainer int measuring chamber. Which operates a piston which oscillates. Number of oscillations measures water usage |
