Powered Equipment Safety—Compressors and Portable Generators Flashcards
What makes electrical Construction work easy and safer
Compressed air
What is compressed air use for
To drive pneumatic tools such as jack hammer, air tampers, air chisels or drills and missiles
How does a compressor work
A moving piston back in forth through a cylinder produces a compress air. The air produce in that cylinder is moved to a air tank which build up certain psi which is control with a regulator
What does PSI stand for
pounds per square inch
What does a regulator do in a compress system
Once the correct psi is reach in the tank the regulator cuts the power from the driving force
when the psi drops the regulator open it up to allow the drive force to build the correct psi.
What is a driving force
The driving force can a hand pump, an electric motor or a diesel engine. its duty to move the piston
What happen if the regulator malfunction
If the regulator fails to keep the safe psi there’s a safety valve on the tanks that open up and let out excess pressure but if the safety valve fails the air tank will eventually explode
What is a Petcock Valve and how its operated
Air tank makes moisture and a way to release it is through the petcock valve which is in the bottom of the air tank
What happen if the moisture from the air tank is not drained
it becomes compromised because it can rust the air tank from the inside or it can freeze the water accumulated from the moisture
What is a ball valve and ehere its located
It’s a shutoff valve that is connected in the point of release to control the compress air
The ball valve is located at a convenient location on the outside of the truck or trailer.
What air hoses
Air hoses are attached to the ball valve with air couplings that turn against each other by 90°, locking each half together. The hose is used to carry compressed air to the pneumatic tool, which is connected at the other end
For air hoses to be safe what you need
spring-loaded loop at each end
Air compressor brings two safety concern
noise associated with the pressure behind the air and the noise of any pneumatic tools
Osha subpart D, 1926.52) is based on what safety
amount of exposure time to that noise before permanent hearing loss may occur
85 decibels
eight-hour
88 decibel
four hours
91 decibels
two hours
94 decibels
one hour
normal conversation
60 decibels
Typical city traffic has a noise
85 decibel
lawn mower
90 decibels
pneumatic drills
120 decibels
jackhammers
130 decibels
What are other safety concerns about compressor
-Never direct the jet of air towards any persons or animals.
-Air compressors must not be used for pharmaceutical, food, or sanitary purposes.
-Compressor air is not suitable for breathing. Do not attempt to fill scuba tanks.
-Be cautious as to where air hoses are placed because they may be a tripping hazard.
When electricity is need and is not available what people use
Generator
How does energy produce electricity
produce electricity by converting mechanical energy to electrical energy
mechanical energy is provided by a gas engine, which rotates a shaft inside a magnetic field. Attached to the shaft is a series of conductors. The rotation of the conductors in the magnetic field produces an electromotive force (EMF) on the conductors, which then is output for electricity to the outlets on the generator.
What is a safety concerns for generators
A great concerns about generator is where to put them because they are combustion gas engine that produce carbon monoxide
What are places that generator are never to place while rin operation
such places are a house, basement, crawl space, garage. or other partially enclosed spaces
What is carbon monoxide
its a colorless and order less gas that is not detected by the human senses.
What are the effects of carbon monoxide when expose to it
will lead to a feeling of nausea, which could be followed by dizziness, weakness, full incapacitation, and even death.
In order for generator to run properly and with out harming anybody it needs to be place where
in a well-ventilated area outdoors
What is needed to fuel a generator
Never fuel a generator while it is running and the engine is hot. Spilled gas or fumes could ignite from the heat of the engine. Shut the generator off and allow the engine to cool before filling the gas tank. The heat of the engine is also enough to cause severe burns to bare skin. Never touch any part of the engine until it has had time to sufficiently cool.
What other hazards does generator pose other than fumes
Electrical Hazards
What is a way to protect yourself from an electric shock from a generator
Using a ground fault circuit interrupter (GFCI)
note: some generators bring a GFCI and some don’t
Operator’s Manuel of generator has the info about GFCI if it has it
How does a GFCI operates
it opens the circuit if it detects an imbalance of the load
what cause an imbalance of a load
frayed or crushed wires in the cord causing a direct or partial short, an improperly grounded tool, or a significant amount of current flowing upon the start of a device such as a large motor.
Never operate the generator when its….
wet or muddy condition makes sure it place in flat dry surface such as a tent to protect it from moisture
Why Extension cords pose as one of the biggest hazards
Improper gauge of the wire burn up or becomes really hot making it a hazard
How to inspect a Extension cord
Inspect the outer jacketing of the extension cord for any cuts or damage to the cord before using it.
Check the male end of the cord and make sure all three prongs are intact.
Never use a cord that has had the third grounding prong removed.
If damage is found, destroy the cord by cutting off both ends.
What is to consider of a generator
The size of the generator base on watts
What is the difference between lights and induction motor tools
Motor induction uses 3 to 7 times that watts to start and after its running it power cuonsumbtion drop to 1/3 but apliance like light is the same watts throguh out
What you need to calculate the wattage safely of tool
always add an extra 10 to 20 percent of wattage for appliance
What happen with devices run on low voltage
it becomes damage
To safely operate a generator in you house you need what
properly rated transfer switch
