06 Outside Odor of Gas

Question 1

When you conduct your size up at NGEs, you need to have several tracks (higher and lower life safety concerns, different gas leak sources, etc) and possible strategy and tactical solutions or outcomes for the situation.

Question 2

Always consider at least the most likely scenario and ___________.

Answer 2

the most dangerous.

Question 3

If you are using a 4-gas monitor, remember that your lowest detection level is:

Answer 3

1% LEL or 500 ppm

Question 4

NG in a low-pressure system poses a risk of silently engulfing you. Low pressure usually worries gas mechanics more than elevated pressure because it eliminates telltale danger signs such as …

Answer 4

noise or dancing soil

Question 5

If you suspect a migrating underground leak, the priority is life safety. You need tofind out:

Answer 5

1. Where it is migrating to
2. How much
3. How far

Question 6

Factors that influence underground gas migration:

Answer 6

1. Paving
2. Frost
3. Soil density
4. Underground utilities
5. Time (longer it blows the more there is)
6. Damage
7. Gas pressure
8. Masked odor
9. Vegetation
10. Cleanliness of subsurface structure
11. Bubbles

Question 7

Damage from excavating:

Answer 7

Pipes may be damaged inside the house, creating another escape point in addition to the obvious one in the excavation.