Unit 7 Assignment - John Perkins

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Running head: UNIT VII ASSIGNMENT 1 Unit VII Assignment John Perkins FIR 5301 Fire Protection Technology Dr. Steven Gillespie August 22, 2023
UNIT VII ASSIGNMENT 2 Unit VII Assignment Executive Summary Throughout the course we have spent an extensive amount of time reviewing the fire protection systems for the City of Washington Distribution Warehouse. In Unit I we were introduced to fire protection systems and discussed the ethics of fire protection. In summary we learned that it is vital for a person involved in fire protection to have integrity and do what is right to protect the occupants of a facility even if the choice may be costly and unpopular. In Unit II we discussed the basics of a fire protection system and began to talk about placement of the individual components of a system. Unit III we began to discuss detection and alarm systems and learned about the importance of them. Unit IV was an overview of water supply systems and how important water pressure is to most fire suppression systems. Unit V was an expansion upon Unit IV and explained in detail the different types of water and foam-based fire suppression systems. Unit VI explained standpipe and hose systems and their use in high-rise facilities. Unit VII closed out with an abundance of information on fire pumps and how they work to supply water pressure to the fire protection system within a facility. Given all this information, the first step I would take to fix all the issues within the warehouse after the fire would be to upgrade the fire alarm control unit. The system that was in place did not meet the new intent of the warehouse and was designed for an occupant that had some type of fire brigade on staff. The pre-signal system likely led to a breakdown in communication and response from the fire department. After upgrading the control unit, I would ensure that a new fire pump was installed in the facility that was up to all the applicable codes and requirements. In addition, all the supporting
UNIT VII ASSIGNMENT 3 equipment for the pump would need to meet National Fire Protection Association (NFPA) guidelines and be Underwriter’s Laboratory (UL) listed. The last thing I would ensure happens is a thorough inspection by a fire protection engineer to guarantee that we are doing the best job possible to prevent fires and protect the occupants of the building. An expert in the field would be critical to validate that our system after updates met all the requirements of the NFPA and will provide adequate protection. SECTION I: Throughout the course we have discussed the fire protection systems within the City of Washington Distribution Warehouse in depth. While there are definite issues with the current fire protection system in the building, the first problem that needs to be addressed is the safety culture within the building. The points to ponder scenario for Unit V explains the scenario that led to a fire in the warehouse. ( Unit V Study Guide ) Workers were welding to repair a structural support in the facility after a forklift had contacted it and their sparks ignited cardboard located below their work area. The first foul in this scenario is the fact that the forklift operator likely had the boom on the truck too high and was surely not aware of his surroundings. The Occupational Safety and Health Administration (OSHA) outlines the requirements for forklifts and operators which were likely not followed. (1910.178) While this cannot be confirmed as a source of the initial problem, it is likely to be a contributing factor to the fire. In addition to the lack of safety precautions regarding the forklift operation, the welders also did not follow OSHA laws regarding the use of a hot work permit. Had the workers been following OSHA guidelines, the entire emergency would have likely been avoided. The fact that
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UNIT VII ASSIGNMENT 4 there was cardboard directly below where the welders were working is a blatant disregard of federal laws as outlined in 29 CFR 1910.252. (1910.252) In addition to their failure to move the combustible material, the also did not have any type of portable fire extinguisher within 100 feet of their operations. Looking past the poor safety culture within the warehouse, we find that the fire protection system installed was not adequate for the task at hand. The storage facility was repurposed from its original design which changed the requirements of the sprinkler system. The current system is wet pipe, water based which is adequate for what is stored in the warehouse. While there are some flammable liquids that are occasionally stored in the warehouse, there is not enough to warrant the use of a foam fire suppression system. Most of the storage space is filled with material that is better suited to a water pipe system. Given that the warehouse is indoor, a dry pipe system is also unnecessary because there isn’t a risk of the pipes freezing. Given that the system is a wet pipe, the most important piece of the system is the water contained within the pipes and the pressure behind the water to extinguish a fire. Without adequate pressure the water will not be effective at fighting any fires. Considering that in our scenario, we have a gallon per minute (GPM) discharge of 157.5 throughout the system, and it is being discharged through the 7 sprinkler heads in the immediate area, our flow would be 22.5 GPM per sprinkler head. (157.5gpm/7 sprinkler heads=22.5GPM) the coefficient our sprinkler orifice in the scenario is 5.6. With this data we can calculate the pressure or psi using the following formula Q²/K²=P or 22.5²/5.6²=16.14psi. SECTION II:
UNIT VII ASSIGNMENT 5 Upon review of the Unit VII study guide, and the information provided in previous units, we know that the fire pump for the warehouse was not up to code outlined by the NFPA. (Unit VII Study Guide) The pump used in the scenario is foreign made which has no bearing on the inadequacy of the pump however it does not meet the requirements of being UL approved. Due to the configuration of the pump, elbows were required to be installed after the pump was placed which has the potential to cut down on the pressure that the pump can produce as the water flowing into the pump is restricted. The pump has not been tested since it was installed, and no maintenance records were available. When power was restored after the fire to was found that the electric motor was damaged, the pump was not grounded properly, and the surge protector supplying power was not UL approved either. All these faults can compound leading to a failure within the pump system and in this case they did. To rectify these issues, the replacement pump needs to meet the NFPA standards from the start. The plumbing needs to be installed correctly and needs to be inspected by a qualified technician upon completion. Maintenance needs to be performed on the pump and most importantly documented on a weekly or monthly basis depending on the type of pump. (Hart, 2022) If it wasn’t documented, it didn’t happen in this case. The electrical system supplying power to the pump needs to be grounded and adequate for the application. All devices installed with the fire pump need to be UL listed and approved to ensure they meet the intent of the NFPA. SECTION III: In the scenario we have been discussing, the motor for the fire pump was damaged due to an electrical surge. Surge protection devices are critical to preventing damage during power fluctuations. In the case of a fire, there are many other things going wrong within a facility and
UNIT VII ASSIGNMENT 6 the chance of a power surge damaging the fire pump are too risky. Most fire protection circuits within a building are locked to the on position as a breaker tripping in the event of a fire could be catastrophic. It is viewed by most that the fire caused from a breaker being locked on will be prevented by the fire protection system and will benefit more than it will hurt. Power surges can happen at any time due to weather, or other unforeseen circumstances. The event leading to a power surge could be unknown and if the fire pump were to be damaged in an unrelated event to a fire, people within a facility may have no idea that their pump will not operate as intended in case of an emergency. While periodic maintenance is a must and would highlight the fact that the pump is not operable, a power surge could happen at any time between maintenance inspections leading to a failure.
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UNIT VII ASSIGNMENT 7 References: 1910.178 - powered industrial trucks. Occupational Safety and Health Administration. (n.d.). https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.178 1910.252 - general requirements. Occupational Safety and Health Administration. (n.d.-b). https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.252 Hart, J. (2022, September 9). Weekly or monthly no flow (churn) tests of fire pumps . National Fire Prevention Association. https://www.nfpa.org/News-and-Research/Publications-and- media/Blogs-Landing-Page/NFPA-Today/Blog-Posts/2022/09/09/Weekly-or-Monthly-No- Flow-Churn-Tests-of-Fire-Pumps Unit V Study Guide . Columbia Southern University. (n.d.). https://online.columbiasouthern.edu/ultra/courses/_146046_1/outline/edit/document/_8863 135_1?courseId=_146046_1&view=content Unit VII Study Guide . Columbia Southern University. (n.d.). https://online.columbiasouthern.edu/ultra/courses/_146046_1/outline/edit/document/_8863 140_1?courseId=_146046_1&view=content