Confined Spaces ( ANSI Z117.1) Flashcards
What are the characteristics of a confined space?
Limited / restricted openings for entrance or exit
not designed for continuous occupancy, only large enough to enter and conduct work
Can be classified as permit required on no permit required
What is the definition of a hazardous atmosphere
A dangerous atmosphere that can cause harm to people in it
Examples Oxygen deficient or enriched, Flammability or explosivity, toxic
What is the definition of a permit required confined space?
A space where the hazards are controlled but still present but are immediately dangerous to health and life. Could effect the worker’s ability to leave the space without assistance
Contains/could contain a hazardous atmosphere
contains material that could engulf someone
has a configuration that could someone could become trapped
contains any other recognized serious safety hazard
What is the definition of a qualified person
A person who by reason of training, education, and experience is knowledgeable in the operation to be preformed and is competent to judge hazards involved and to specify controls and protective measures
Testing should be conducted to identify hazardous atmospheres before entry is permitted into a confined space. What tests should be conducted? In what order should the tests be performed? (ANSI, Z117.1-2016. Section E6.1)
Tests with calibrated direct reading instruments for oxygen content, flammable gasses or vapors, and for toxic air contaminants in that order
- What are acceptable limits within a confined space for each of the following? (ANSI, Z117.1-2016. Section 6.3.1.1 to 6.3.1.3))
Oxygen:
Flammability:
Toxicity:
Oxygen- between 19.5% and 23.5%
Flammability- Below 10% of the Lower Explosive limit
Toxicity- Less than the recognized exposure limits for the specific product
(Example Carbon monoxide is no more than 50 parts per million)
- Which national code describes requirements for electrical equipment to be used in hazardous locations? (ANSI, Z117.1-2016. Section 12.4)
NFPA 70
When an employer arranges to have employees of another employer (contractor) perform work that requires confined space entry, what information must the employer give the contractor about the confined space? (ANSI, Z117.1-2016. Section 17.1)
A) The classification of the space ( permit/ non permit)
B) Hazards and the operations within or near the space
C) the employer’s experience with the space
D) Any precautions or procedures that the host employer has implemented for the precaution of employees in or near the confined space where the contractor personnel will be working
