Fire extinguisher
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- | | Valve Pin|| Does not seal properly || Could result in slow loss of pressure from the canister, leaving the extinguisher useless || 10 || Rubber gaskets may not fit on the pin correctly resulting in an ineffective seal || 3 || Test seals performance at large range of pressure|| 2 || 60 || Find a better way to secure gasket to pin || - || 10 || 3 || 2 || 60 || | + | | Valve Pin|| Does not seal properly || Could result in slow loss of pressure from the canister, leaving the extinguisher useless || 10 || Rubber gaskets may not fit on the pin correctly resulting in an ineffective seal || 3 || Test seals performance at large range of pressure|| 2 || 60 || Find a better way to secure gasket to pin || Design Engineers || - || 10 || 3 || 2 || 60 || |
Revision as of 21:59, 23 September 2007
Automated fire extinguisher
Item & Function | Failure Mode | Effects of Failure | S | Causes of Failure | O | Design Controls | D | RPN | Recmd Actions | Responsibility & Deadline | Actions Taken | S* | O* | D* | RPN* | |
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Mounting Bracket | Extinguisher falls off bracket | Compromises structural integrity of the canister and triggering mechanism. | 8 | Canister not secured to bracket | 5 | Secure canister to bracket | 5 | 125 | Add strap to make sure canister is secured to bracket | Design Engineers | - | 5 | 5 | 5 | 125 | |
Bracket falls off wall | Compromises structural integrity of the canister and triggering mechanism | 5 | Bracket not screwed securely to wall | 5 | Test mounting bracket on different types of walls | 3 | 75 | Treat motor axis to add strength | Design Engineers | - | 5 | 5 | 3 | 75 | ||
Pressure Gauge | May not display proper reading. | Empty extinguisher could read as full. | 10 | Pressure from canister not correctly transmitted to gauge. | 2 | Test gauges by slowly discharging canister | 3 | 50 | Increase space around the pressure gauge in order to ensure that the gauge correctly reads the pressure in the canister | Design Engineers | - | 10 | 2 | 3 | 50 | |
Safety Pin | Pin breaks and cannot be removed | If the pin cannot be removed, the extinguisher will not discharge | 10 | Pin is thin, may snap if not pulled out straight | 3 | Test strength of pin | 2 | 50 | Make pin thicker. Use stronger plastic. | Pin Manufacturer | - | 10 | 3 | 2 | 50 | |
Top Assembly
| Top handle breaks | Cannot depress pin to trigger the extinguisher | 10 | Extinguisher falls or is hit by an object | 1 | Test durability of top handle | 5 | 50 | Increase thickness of plastic. Use Stronger Plastic | Design Engineers | - | 10 | 1 | 5 | 50 | |
Bottom Handle breaks | Uncomfortable to hold/use | 3 | Extinguisher falls or is hit by an object | 1 | Test durability of bottom handle | 5 | 15 | Increase thickness of plastic. Use Stronger Plastic | Design Engineers | - | 3 | 1 | 5 | 15
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Valve Pin | Does not seal properly | Could result in slow loss of pressure from the canister, leaving the extinguisher useless | 10 | Rubber gaskets may not fit on the pin correctly resulting in an ineffective seal | 3 | Test seals performance at large range of pressure | 2 | 60 | Find a better way to secure gasket to pin | Design Engineers | - | 10 | 3 | 2 | 60 |
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Canister | Over pressurized | Could result in unexpected rapid decompression, rendering the extinguisher useless and possibly exploding | 10 | Canister is over pressurized | 3 | Test canister to see its maximum pressure | 2 | 60 | Increase safety factor by increasing the maximum pressure rating of the canister | Design Engineers | - | 10 | 3 | 2 | 60 |
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