G60 Environmental Considerations 2

Question 1

When using a flammable gas torch near a drain or sewer opening, what is the primary environmental concern?

Accepted Answer

Vapors can travel along drains and ignite remotely

Answer

Flammable gas vapors are heavier than air and can flow into drains, traveling to distant ignition sources and causing remote explosions.

Question 2

Which weather condition most significantly increases the hazard when using a torch outdoors?

Accepted Answer

Low wind speed or still air

Answer

Still air allows flammable gas vapors to accumulate near the work area rather than dispersing, increasing the risk of ignition.

Question 3

What environmental precaution must be taken before torch work on a roof with bituminous materials?

Accepted Answer

Check for combustible materials in the space below

Answer

Heat from torch work can conduct through the roof deck and ignite combustibles stored or present in the space directly below.

Question 4

How should empty flammable gas cylinders be stored after torch work is complete?

Accepted Answer

Upright, capped, outdoors in a ventilated area away from heat sources

Answer

Empty cylinders still contain residual gas and must be stored upright with valve caps on in ventilated outdoor areas away from heat sources.

Question 5

What is the recommended action if torch work must be performed near plastic or PVC piping?

Accepted Answer

Shield or remove the piping before torch work begins

Answer

PVC and plastic pipes can release toxic fumes when heated and should be shielded or temporarily removed before torch work.

(G60) Certificate of Fitness for Torch Use of Flammable Gases Practice Test