6.11 Basic Gas Free Engineering

Question 1

Toxic Gas Bill

Answer 1

Gives guidance on the location and characteristics of specific toxic substances found onboard

Question 2

Toxic

Answer 2

A space where poisonous substances are present, exposure cannot exceed OSHA (Occupational Safety and Health Administration) standards

Question 3

Permissible Exposure Limit (PEL)

Answer 3

The maximum permissible concentration of a toxic or harmful physical agent to which personnel may be exposed

Question 4

Lower Explosive Limit (LEL)

Answer 4

The minimum percent by volume of a gas that, when mixed with air, will form a flammable mixture

Question 5

Upper Explosive Limit (UEL)

Answer 5

Upper end of the explosive range
Concentrations above this limit are too rich to explode or burn
Concentrations below the UEL are within the explosive range

Question 6

Oxygen surplus

Answer 6

Oxygen level above 22%

Question 7

Oxygen deficiency

Answer 7

Oxygen level below 19.5%

Question 8

Explosive atmospheres

Answer 8

Are determined based upon the volume of the vapor, its temperature, and its pressure

Question 9

Toxic atmospheres

Answer 9

Determined by the exposure limits of toxic gases set by OSHA and can be found in the NIOSH (National Institute for Occupational Safety and Health) pocket guide

Question 10

Gas Free Engineer (GFE)

Answer 10

Must be an E-7
Must have all formal training and 40 hours of training OTJ
Will conduct all initial Gas Free Tests to certify space entry

Question 11

Gas Free Engineering Petty Officer (GFEPO)

Answer 11

E-4 or above
Must complete applicable PQS under the supervision of the GFE/GFEA
Conduct space retests
Conduct post-fire atmospheric testing

Question 12

Gas Free Engineering Program

Answer 12

Inspecting confined spaces
Closing out tanks
Prior to cleaning or painting

Question 13

Types of Hot Work

Answer 13

Flame heating
Welding
Torch cutting
Brazing
Carbon arc gouging

Question 14

Class II Hot Work

Answer 14

Minimal amount of energy
Localized sparks
DCA or Fire Marshal determines if fire watch is required

Question 15

Class I Hot Work

Answer 15

High amount of energy
Scattered sparks
Fire watch is required

Question 16

Fire Watch Requirements

Answer 16

All affected sides must be watched
Communication devices must be available
Portable fire extinguisher or hose must be within reach
PPE must be worn
Flammables must be moved 50 feet from work area
No hot work can be performed within 40 feet of painting or chemical cleaning
Watch must stay until 30 minutes after work or until cool to touch

Question 17

Cold Work

Answer 17

Operations which involve only inspections, cleaning or minor repair where no hot work will be conducted.