Scaffolding/Random Flashcards
Solder content 60-40
60 tin 40 lead
How are soldering coppers sized?
Weight per pair. 4lb coppers give two Coppers of 2lb
Find straight section of reducing elbow
Big end minus small end
What is Carbonic acid
When CO2 dissolves in water vapour, causing corrosion
Max temp of b vent
480F
b Vent can only be used for what gas types
Propane or NG. Not suitable for coal, wood or oil
B vent is made of ?
Aluminum interior, galvalume exterior
What is L Vent?
Rated for what type of fuel ?
Max temp?
Made out of ?
Similar to B vent
max temp 570F
Approved for Oil burning
Inner wall stainless/aluminum
Minimum platform width of a scaffold
20inches or two planks
Lowest grade of Manila rope for overhead lifting
Number 1
How strong is nylon rope compared to Manila rope?
2.5x stronger
WLL stands for?
Working Load Limits - minimum for supporting workers is a factor of 10
How much strength is lessened in a rope with a knot?
50%
What amount of rope strength can be used for lifting or pulling ?
1/9 over head
1/5 for pulling
A Threaded sleeve that is driven in and bolt thread to it ?
Drop in anchor
Light duty anchor?
Nail in (pin bolt)
Force that pulls straight down
Tensile
Force at 90 degrees to Fastner
Sheer
Anchor placed in form BEFORE concrete is poured
Hanger insert
Manufacturers rated load capacity should be divided by a factor of ___ to determine the safe working capacity of an anchor
4x
How many BTU to raise 55 cu. Ft. Of air 1degree F?
1 BTU
ABC requirements about fuel fired appliances installed on the roof or outside building?
1.2M from property line measure horizontally
Define term outlet throw
Displayed in feet
Distance air travels from centre of diffuser outward to where air velocity drops to 50 FPM
Scaffold design rating
4x the load it will be used on
How long can a scaffold not be used before it needs to be re tagged and inspected ?
21 days
Scaffold tags also expire after 21 days
Scaffold tags include what info?
Duty rating, date inspected, who inspected, notes, expiry
You may not use a scaffold if it has a?
Red tag, no tag, yellow or green expired tag
Employer must ensure that a solid sawn lumber scaffold plank is?
Scaffold grade wood or better, sized 51x254mm (2”x10”)
How far must a wooden scaffold plank extend past edge?
No less than 6” or more than 12” (150-300mm)
The height of a rolling scaffold shall be no more than __x the smallest dimension
3x
A worker must not remain on a rolling scaffold while it’s being moved unless?
The height of the work platform is not more than twice it’s smallest base dimension
Mobile scaffold height requiring guardrails
10’
Pulley adjustment to change CFM
Change motor pulley (driver)
Opening an adjustable pulley
Goes slower or gets smaller
Closing adjustable pulley
Goes faster or gets bigger
To slow down the fan what would we need to do to a pulley?(adjustable)
Use smaller motor pulley
If you close the motor pulley (decrease belt tension) what happens to the fan ?
Speed up
Eavestrough slope?
1” per 16’
