Permit to Work
What is the Maximum validity period of a permit to work?
one 12 hour shift
Hot work is defined as:
Hot Work are tasks involving open flame or spark producing operations such as grinding, welding, or cutting.
What is the safe range for Oxygen
19.5 - 23.5 %
What document must be completed when the Permit Issuer determines detailed hazard evaluation is needed?
Job Safety Analysis
JSA
This person must complete the permit by clear and legible printing, all individuals must be specifically identified by printed first and last name, all signatures must be accompanied by a clearly printed name
Permit Issuer
If LEL levels exceed _________%, work must stop immediately until the area is deemed safe.
5%
What is the hazard of too much oxygen?
(>23.5% O₂): Increased fire/explosion risk
What is the primary hazard associated with hot work?
fire and explosions
Prior to approving a permit, the Permit Issuer shall ______________________ with the Permit Receiver to ensure thorough completion of the permit and safety of the job.
conduct an inspection at the specific location where the work is to be performed
When is an LEL meter required to be used?
before starting hot work and continuously monitored during the task
What is the most common source of CO2 gas?
respiration from animal
What are the elements of a fire triangle?
fuel
heat
oxygen
How often must the Permit Issuer return to the work to ensure hazards remain identified and properly mitigated and assist with any questions from the work group?
periodically
When is a fire watch required to be present?
during the operation and remain 30 minutes after the hot work has been completed
What are the methods of detecting CO gas?
What does the acronym "LEL" stand for
Lower Explosive Limit
This person must explain to each individual in the work group the details of the work permit, and details of work to be performed and ensure details are understood by each person in the work group, and ensure each worker is listed on the permit.
Permit Receiver
What are the two LEL alarm settings on our 4 gas meters?
LEL
Lo Alarm = 5 %
High Alarm = 20 %
Which gas has the largest explosive range?
methane
hydrogen
propylene
Combustible Gas Explosive Range:
- methane: 5 - 15% in air
- HYDROGEN: 4 - 75% in air
- propylene 2 - 11.1 % in air
What is the UEL for methane?
Combustible Gas Explosive Range:
Methane: 5-15% in air
UEL is 15%