Commercial Equipment Installation Flashcards
How do you size a commercial garburator?
Sized by meals per day and the type of facility it will be installed in
What is the only approved method of connecting a storage device to a drainage system?
Indirect connection
What views are involved in an orthographic drawing?
Front, top and side and are drawn to scale
What angle are the horizontal lines projected at on an isometric drawing?
30°
A dishwashing or food preparation sink has what kind of overflow?
Standing overflow (bitransit waste)
What 2 dimmensions are indicated on a floor plan?
Width and length
At what point on an atmospheric vacuum breaker is the critical level?
The lowest point (bottom) of the device unless otherwise marked
What are the 3 degrees of hazard when choosing a cross-connection control device?
Severe, moderate, minor
What is the maximum temperature allowed to discharge into a drainage system of clear water waste or sewage?
75°C (167°F)
What is the maximum recommended flow velocity for cold water through copper tube?
2.4 m/s
The average pressure loss method of waterline sizing requires a minimum flow of what?
2.6 kpa per metre
When calculating whether or not you can use the average pressure loss method of sizing what is the pressure loss factor used for every metre of elevation gain?
10 kpa per metre
When determining the use of the average pressure loss form of waterline sizing, how do you calculate the adjusted developed length?
Developed length x 1.5 = adjusted D.L.
When pumping water through equipment for sanitization, the temperature should be maintained to at least what temerature and for what length of time?
77°C (171°F) for at least 5 minutes
When immersing equipment for sanitization, the temperature should be maintained to at least what temerature and for what length of time?
77°C (171°F) or above for 30 seconds
How many litres are in a imperial gallon?
4.54 liters per imp gallon
For what application would you use a dual check with atmospheric port (DCAP)?
When the hazard is minor and protects against both back pressure and back siphonage
Where would you normally use or find a dual check valve backflow preventer (DuC)?
Used when the hazard is minor in a residential application
Where would you find a hose connection vacuum breaker (HCVB)?
Where the hazard is minor and effectively protects against backflow caused by back siphonage
Where would you use an atmospheric vaccum breaker (AVB) and what is its function?
This device is to protect from back siphonage only and is not designed for continuous usage. AVB’s will be installed on hose outlets, washing equipment and a wide range of kitchen equipment
What is the maximum allowable operating time on an atmospheric vacuum breaker?
12 hours
Where is critical level on an atmospheric vacuum breaker?
Lowest point (bottom)
Where would you use a pressure vacuum breaker (PVB) and what is its function?
- Pressure vacuum breakers are used when a hazard is minor and moderate.
- If a problem occures, discharge flow will be visible and you will hear the sound of air rushing
- the code states that pressure vacuum breakers will be installed a minimum of 12 inches above the flood level rim or highest point open to atmosphere
- most commonly found on sprinkler systems
Where would you find a double check valve assembly (DCVA)?
- Used when the hazard is minor or moderate. If a problem occurs, no discharge flow will be visible
- found on heating equipment, steam generators or irrigation systems
- four test cocks make it possible to test a DCVA
How do you size an air gap?
Minimum 25mm (1”) or 2 pipe diameters
When extracting tees from type K or L copper tubing, the joint is to be brazed with a filler metal thay has a melting point of what?
At least 540°C
How far should a lead closet stub be below the floor flange?
75mm (3”)
What type of copper tube shall not be bent?
DWV and M type
What 2 applications would you use a wiped joint for?
Sheet lead and lead pipe or between copper and ferules
What material must not be used for the fixture drain or the portion of the vent pipe below the flood level rim of manually flushing or waterless urinals?
Copper tube
What fixture must be installed in all food preparation areas?
Hand wash lav w/o overflow arrangement
