Unit VIII- Journal Fire Prevention and Protection_01-16-2024
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Columbia Southern University *
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4308
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Industrial Engineering
Date
Apr 3, 2024
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docx
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Fire Prevention and Protection Audit
Student Name
Columbia Southern University
OSH 4308, Advanced Concepts in Occupational Safety and Health
Dr. Baumgartner
January 16, 2024
Fire Protection and Prevention Audit
A fire protection and prevention audit is conducted in the assembly area to determine the correct amount of fire extinguishers needed for the space. The assembly area measures 80 feet by 140 feet. There are already two 2A108:C fire extinguishers already in the assembly area on both ends measuring 80 feet. There are 40 feet on each side of the two existing fire extinguishers. There are minimal amounts of flammable and combustible materials present. The hazard level is rated as ordinary with moderate amounts of Class A Combustibles. To find the quantity of fire extinguishers needed for the assembly area will depend on several factors. Types and quantity of combustible materials present, to include room size and level of fire hazards. The assembly area in this audit measures 80 feet by 140 feet. There are moderate amounts of Class A combustibles and a minimal amount of flammable combustible materials. Combustibles classified as Class A are common combustibles such as wood, paper, cloth, rubber, trash and plastics. Flammable combustibles are considered to be Class B and consist of liquids, gases, solvents, oil, gasoline, paint, lacquers, tars, and synthetic or oil-based products. First calculation needed is the approximate floor area of the assembly area: Area = Length x Width
Area = 80 feet x 140 feet
Area = 11,200 square feet
The second factor would be to figure out the type of fire extinguisher needed for Class A combustibles present in the assembly area. A fire extinguisher used for Class A fires is required one per every 3,000 square feet.
Required extinguisher rating ¿
Area
3,000
Square feet
Required extinguisher rating ¿
11,200
square feet
3,000
squarefeet
Required extinguisher rating =3.73 (or 4 rounded to the nearest whole number).
According to the above calculations there would be 4 fire extinguishers required for Class A combustibles in the assembly area. Two fire extinguishers rated as 2A10B:C are currently installed in the assembly area. The rating “2A” extinguishers are fitting for Class A Fires and rating “10B:C” are appropriate for Class B (flammable liquids and gases) and Class C (electrical fires). Fire extinguishers with this rating are appropriate for either Class A or B fires. Calculations show there are 4 extinguishers needed and there are two already installed, so two additional Class A extinguishers would need to be installed in the assembly area to meet requirements. WBGT Index
There are several employees working along a conveyor line manually shoveling materials to clean up an overspill of product. It will take several days to clean up the overspill which is located at the outside conveyor. The wet bulb glow temperature (WBGT) index will need to be determined based on: Wet Bulb Temperature = 88⁰F, Dry Bulb Temperature = 93⁰F, and Globe Temperature = 91⁰F. Employees
can only work in these conditions 190 minutes during the 8 hour workday also assuming a 75⁰F exposure for 290 minutes. Wet bulb globe temperature (WBGT) is found by using the following calculations:
WBGT = (0.7 x Tw) + (0.2 x Tg) + (0.1 x Td)
Td = dry bulb temperature in Celsius
Tx = wet bulb temperature Tg = global temperature
WBGT = (0.7 x 88) + (0.2 x 91) + (0.1 x 93)
WBGT = 61.6 + 18.2 + 9.3
WBGT = 89.1⁰F
Wet bulb global temperature (WBGT) index is found by using the following information and calculations:
Wet Bulb Temperature (WB) = 88⁰F
Dry Bulb Temperature (DB) = 93⁰F
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Globe Temperature (GT) = 91⁰F
WBGT = (0.1DB) + (0.7WB) + (0.2GT)
WBGT = [(0.1) (93⁰)] + [(0.7) (88⁰)] + [(0.2) (91⁰)]
WBGT = 9.3 + 61.6 + 18.2
WBGT = 89.1⁰F
According to the guidance of the National Institute for Occupational Safety and Health (NIOSH) employees being exposed to 85-90⁰F should take breaks for 15 minutes after working 45 minutes. Doing
so will assist in mitigating possible heat stress and other health illnesses. Wind Chill
The wind chill factor is used to find the approximate temperature based on wind speed and actual air temperature that the body feels. The wind chill factor will determine the correct amount and type of clothing needed to be outdoors. Wearing sufficient clothing, monitoring protein, carbohydrate, and fluids are all factors to be considered when mitigating cold related injuries. Considering the wind chill concept at ⁰F using air temperature of 10⁰F and wind speed of 12 miles per hour (mph) the wind chill can be calculated by:
T
= air temperature (F⁰)
V
= wind speed (mph)
Wind Chill (F⁰) = 35.74 + 0.6215
T
– 35.75 (
V
0.16
) + 0.4275
T
(
V
0.16
)
surface wind speed Wind Chill (F⁰) = 35.74 + 0.6215(10) – 35.75 (12
0.16
) + 0.4275(10) (12
0.16
)
Wind Chill (F⁰) = 35.74 + 6.215 – 35.75 (1.5) + 4.28 (1.5)
Wind Chill (F⁰) = 41.96 – 53.62 + 6.24
Wind Chill (F⁰) = -5.42
Wind Chill = -5⁰