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Logan 4th year > Commercial Equipment Installation > Flashcards

Commercial Equipment Installation Flashcards

1
Q

How do you size a commercial garburator?

A

Sized by meals per day and the type of facility it will be installed in

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2
Q

What is the only approved method of connecting a storage device to a drainage system?

A

Indirect connection

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3
Q

What views are involved in an orthographic drawing?

A

Front, top and side and are drawn to scale

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4
Q

What angle are the horizontal lines projected at on an isometric drawing?

A

30°

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5
Q

A dishwashing or food preparation sink has what kind of overflow?

A

Standing overflow (bitransit waste)

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6
Q

What 2 dimmensions are indicated on a floor plan?

A

Width and length

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7
Q

At what point on an atmospheric vacuum breaker is the critical level?

A

The lowest point (bottom) of the device unless otherwise marked

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8
Q

What are the 3 degrees of hazard when choosing a cross-connection control device?

A

Severe, moderate, minor

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9
Q

What is the maximum temperature allowed to discharge into a drainage system of clear water waste or sewage?

A

75°C (167°F)

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10
Q

What is the maximum recommended flow velocity for cold water through copper tube?

A

2.4 m/s

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11
Q

The average pressure loss method of waterline sizing requires a minimum flow of what?

A

2.6 kpa per metre

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12
Q

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?

A

10 kpa per metre

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13
Q

When determining the use of the average pressure loss form of waterline sizing, how do you calculate the adjusted developed length?

A

Developed length x 1.5 = adjusted D.L.

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14
Q

When pumping water through equipment for sanitization, the temperature should be maintained to at least what temerature and for what length of time?

A

77°C (171°F) for at least 5 minutes

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15
Q

When immersing equipment for sanitization, the temperature should be maintained to at least what temerature and for what length of time?

A

77°C (171°F) or above for 30 seconds

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16
Q

How many litres are in a imperial gallon?

A

4.54 liters per imp gallon

17
Q

For what application would you use a dual check with atmospheric port (DCAP)?

A

When the hazard is minor and protects against both back pressure and back siphonage

18
Q

Where would you normally use or find a dual check valve backflow preventer (DuC)?

A

Used when the hazard is minor in a residential application

19
Q

Where would you find a hose connection vacuum breaker (HCVB)?

A

Where the hazard is minor and effectively protects against backflow caused by back siphonage

20
Q

Where would you use an atmospheric vaccum breaker (AVB) and what is its function?

A

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

21
Q

What is the maximum allowable operating time on an atmospheric vacuum breaker?

A

12 hours

22
Q

Where is critical level on an atmospheric vacuum breaker?

A

Lowest point (bottom)

23
Q

Where would you use a pressure vacuum breaker (PVB) and what is its function?

A
  • 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
24
Q

Where would you find a double check valve assembly (DCVA)?

A
  • 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
25
Q

How do you size an air gap?

A

Minimum 25mm (1”) or 2 pipe diameters

26
Q

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?

A

At least 540°C

27
Q

How far should a lead closet stub be below the floor flange?

A

75mm (3”)

28
Q

What type of copper tube shall not be bent?

A

DWV and M type

29
Q

What 2 applications would you use a wiped joint for?

A

Sheet lead and lead pipe or between copper and ferules

30
Q

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?

A

Copper tube

31
Q

What fixture must be installed in all food preparation areas?

A

Hand wash lav w/o overflow arrangement

Logan 4th year (9 decks)

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