Utility Emergencies

Question 1

BLEVE

Answer 1

Boiling Liquid Expanding Vapor Explosion

Question 2

Intrinsically safe

Answer 2

Incapable of producing sufficient heat or spark

Question 3

Stopcock valve

Answer 3

Quarter turn valve used to restrict or isolate flow of liquid or gas in a pipe

Question 4

TWA

Answer 4

Time Weighted Average-Average exposure to a contaminant or condition to which workers amu be exposed to without adverse affects over an 8hr day or 40hr work week.

Question 5

Vapor density

Answer 5

Ratio of weight of a given volume of gas or vapor to the weight of equal volume of air at same temperature and pressure. >1= heavier than air <1= lighter than air

Question 6

Utility marks

Answer 6

Red-Electric
Yellow-Gas/petroleum products
Orange- Communication
Blue- Potable water
Purple- Irrigation/Non-potable water
Green- Sewer
Pink-Temporary survey
White-excavation

Question 7

Material abbreviation

Answer 7

CI- Cast iron
CPR-copper
DI-Ductile iron
PL-plastic

Question 8

Miss utility number

Answer 8

18005527001- or 811

Question 9

Natural gas (methane)

Answer 9

Vapor density=.55
Colorless and odorless- mercaptan is added
Transmission pipelines mercaptan is not added
LEL=5%
UEL=15%
Ignition temp 1200*F
Expansion ratio from liquid to gas 600:1
pipeline markers contain, product, company name and number.

Question 10

gas leak positioning

Answer 10

1st unit no closer than 100ft and min 300 for other incoming units

Question 11

Outside gas leaks

Answer 11

upgraded to HazMat incident with pipelines 2” and over.

Question 12

random obscure stuff

Answer 12

Static electricity can be in leaking pipes

Question 13

Random obscure stuff

Answer 13

DOT ERG guide suggests 330ft for evacuation for uncontrolled leaks.

Question 14

Complement for Inside gas leaks

Answer 14

2E 1 Specialty 1Batt

Question 15

Propane

Answer 15

Vapor density- 1.56
LEL 2.3%
UEL9.5%
1 gal weighs 4.23lbs
Ignition temp=920*F-1120*F
Odorless and colorless-ETHYL mercaptan is added 1lb per 10,000 gal.
Gravity-.504

Question 16

Carbon Monoxide (CO)

Answer 16

Formed by incomplete combustion of fossil fuels
LEL 12.8%
UEL 74%
Chemically suffocates. pushes out oxygen in bloodstream.
not ot excded 9PPM over 8hr average in residential
not to exceed 35PPM over 8hr in commercial
Readings greatr than 100PPM are potentially lethal