When must Forced ventilation be used?
Ventilation is used for three general purposes: Remove air contaminants from a worker’s breathing zone and work area, Prevent the accumulation of flammable or combustible gases or vapours; and, Prevent oxygen rich or oxygen deficient atmospheres.
What light Cannot be seen welding?
Radiation is a form of electromagnetic energy supplied by an electric arc that can damage the eye or skin. It is possible to distinguish visible light – however, ultraviolet (UV) and infrared light cannot be seen. The two types of radiation (ionizing and non-ionizing) are present in welding.
When should natural ventilation be used in welding?
Natural ventilation is considered sufficient for welding and brazing operations if the work area meets these requirements: Space of more than 10,000 square feet is provided per welder. A ceiling height of more than 16 feet. Welding is not done in a confined space.
When using extension cords on portable power tools What size are the conductors?
When using extension cords on portable power tools, the size of the conductors must be small enough to enable a drop in voltage.
What is forced ventilation?
A type of building ventilation system that uses fans or blowers to provide fresh air to rooms when the forces of air pressure and gravity are not enough to circulate air through a building.
Is ventilation required for plasma cutting?
Whereas a plasma cutting machine can run endlessly in a heavily saturated environment, the operator running the equipment cannot; fumes will overwhelm the operator in a matter of minutes. The fumes need to be ventilated at the source of production before they can migrate elsewhere.
What causes arc eyes?
A flash burn occurs when you are exposed to bright ultraviolet (UV) light. It can be caused by all types of UV light, but welding torches are the most common source. That’s why it’s sometimes called ‘welder’s flash’ or ‘arc eye’. Flash burns are like sunburn in the eye and can affect both your eyes.
Does welding produce UV light?
Arc welding produces the full spectrum of ultraviolet radiation (UVR). It is possible that welders are at greater risk of developing skin cancer than the general population, but there is a dearth of well designed studies in this area. Studies have demonstrated that welding increases the risk of ocular melanoma.
When must you inspect your tools and extension cords?
every three months
Before use or return to service, testing should be conducted on each piece of equipment every three months. A continuity test is needed to make sure the extension cord or power tool has a grounded wire.
When must you inspect your tools and extension cords quizlet?
All extension cords, Receptacles that are not a part of the permanent wiring of a structure. Equipment connected by a cord and plug that is available for use or is used by employees. Under the program OSHA requires that electrical equipment be inspected daily for damage or defects.
How does forced ventilation work?
MAIN METHODS OF FORCED VENTILATION: PRESSURE SYSTEM: a system which air is blown through the building by a fan or other blower placed at the inlet. VACUUM SYSTEM: causing an inrush of fresh air. This is done by an exhaust fan placed at the outlet to the vent flue or stack.
What are the rules for forced air ventilation?
Third, the air supply for the ventilation must be from a clean source and must not increase the hazards in the space. These provisions ensure that the atmosphere within the permit space remains safe during the entire entry operation.
When to use forced ventilation in an engine?
Depending on the engineroom size and space available for ducts, forced ventilation frequently is required to achieve engine manufacturer requirements. Forced ventilation should include both inlet/supply, and exhaust air.
What does ” continuous forced air ventilation ” mean?
Reply: “Continuous forced air ventilation” means a delivery system or device that provides positive pressure for the space where the employees are working.
Can a portable blower fan be used for forced air ventilation?
Question 2: Does the use of a portable blower fan to clear the air during maintenance periods satisfy the OSHA requirement? Reply: A portable blower fan could be used as the continuous forced air ventilation, provided that it does remove any hazardous atmosphere.
