MTBF and spares: Difference between revisions
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(Created page with "How do MTBF figures relate to the percentage of items still working after a number of years. the tgable below provides the answer. {| {{table}} | align="center" style="backgr...") |
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100||92%||84%||77%||70%||65%||59%||54%||50%||45%||42%||38%||35%||32%||29%||27% | | 100||92%||84%||77%||70%||65%||59%||54%||50%||45%||42%||38%||35%||32%||29%||27% | ||
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125||93%||87%||81%||76%||70%||66%||61%||57%||53%||50%||46%||43%||40%||37%||35% | | 125||93%||87%||81%||76%||70%||66%||61%||57%||53%||50%||46%||43%||40%||37%||35% | ||
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150||94%||89%||84%||79%||75%||70%||66%||63%||59%||56%||53%||50%||47%||44%||42% | | 150||94%||89%||84%||79%||75%||70%||66%||63%||59%||56%||53%||50%||47%||44%||42% | ||
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175||95%||90%||86%||82%||78%||74%||70%||67%||64%||61%||58%||55%||52%||50%||47% | | 175||95%||90%||86%||82%||78%||74%||70%||67%||64%||61%||58%||55%||52%||50%||47% | ||
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200||96%||92%||88%||84%||80%||77%||74%||70%||67%||65%||62%||59%||57%||54%||52%|-|- | | 200||96%||92%||88%||84%||80%||77%||74%||70%||67%||65%||62%||59%||57%||54%||52%|-|- | ||
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225||96%||93%||89%||86%||82%||79%||76%||73%||70%||68%||65%||63%||60%||58%||56% | | 225||96%||93%||89%||86%||82%||79%||76%||73%||70%||68%||65%||63%||60%||58%||56% | ||
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250||97%||93%||90%||87%||84%||81%||78%||76%||73%||70%||68%||66%||63%||61%||59% | | 250||97%||93%||90%||87%||84%||81%||78%||76%||73%||70%||68%||66%||63%||61%||59% | ||
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300||97%||94%||92%||89%||86%||84%||82%||79%||77%||75%||73%||70%||68%||66%||65% | | 300||97%||94%||92%||89%||86%||84%||82%||79%||77%||75%||73%||70%||68%||66%||65% | ||
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350||98%||95%||93%||90%||88%||86%||84%||82%||80%||78%||76%||74%||72%||70%||69% | | 350||98%||95%||93%||90%||88%||86%||84%||82%||80%||78%||76%||74%||72%||70%||69% | ||
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400||98%||96%||94%||92%||90%||88%||86%||84%||82%||80%||79%||77%||75%||74%||72% | | 400||98%||96%||94%||92%||90%||88%||86%||84%||82%||80%||79%||77%||75%||74%||72% | ||
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450||98%||96%||94%||93%||91%||89%||87%||86%||84%||82%||81%||79%||78%||76%||75% | | 450||98%||96%||94%||93%||91%||89%||87%||86%||84%||82%||81%||79%||78%||76%||75% | ||
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500||98%||97%||95%||93%||92%||90%||88%||87%||85%||84%||82%||81%||80%||78%||77% | | 500||98%||97%||95%||93%||92%||90%||88%||87%||85%||84%||82%||81%||80%||78%||77% | ||
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550||98%||97%||95%||94%||92%||91%||89%||88%||87%||85%||84%||83%||81%||80%||79% | | 550||98%||97%||95%||94%||92%||91%||89%||88%||87%||85%||84%||83%||81%||80%||79% | ||
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600||99%||97%||96%||94%||93%||92%||90%||89%||88%||86%||85%||84%||83%||82%||80% | | 600||99%||97%||96%||94%||93%||92%||90%||89%||88%||86%||85%||84%||83%||82%||80% | ||
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650||99%||97%||96%||95%||93%||92%||91%||90%||89%||87%||86%||85%||84%||83%||82% | | 650||99%||97%||96%||95%||93%||92%||91%||90%||89%||87%||86%||85%||84%||83%||82% | ||
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700||99%||98%||96%||95%||94%||93%||92%||90%||89%||88%||87%||86%||85%||84%||83% | | 700||99%||98%||96%||95%||94%||93%||92%||90%||89%||88%||87%||86%||85%||84%||83% | ||
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750||99%||98%||97%||95%||94%||93%||92%||91%||90%||89%||88%||87%||86%||85%||84% | | 750||99%||98%||97%||95%||94%||93%||92%||91%||90%||89%||88%||87%||86%||85%||84% | ||
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800||99%||98%||97%||96%||95%||94%||93%||92%||91%||90%||89%||88%||87%||86%||85% | | 800||99%||98%||97%||96%||95%||94%||93%||92%||91%||90%||89%||88%||87%||86%||85% | ||
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900||99%||98%||97%||96%||95%||94%||93%||93%||92%||91%||90%||89%||88%||87%||86% | | 900||99%||98%||97%||96%||95%||94%||93%||93%||92%||91%||90%||89%||88%||87%||86% | ||
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1000||99%||98%||97%||97%||96%||95%||94%||93%||92%||92%||91%||90%||89%||88%||88% | | 1000||99%||98%||97%||97%||96%||95%||94%||93%||92%||92%||91%||90%||89%||88%||88% | ||
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1100||99%||98%||98%||97%||96%||95%||95%||94%||93%||92%||92%||91%||90%||89%||89% | | 1100||99%||98%||98%||97%||96%||95%||95%||94%||93%||92%||92%||91%||90%||89%||89% | ||
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1200||99%||99%||98%||97%||96%||96%||95%||94%||94%||93%||92%||92%||91%||90%||90% | | 1200||99%||99%||98%||97%||96%||96%||95%||94%||94%||93%||92%||92%||91%||90%||90% | ||
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1300||99%||99%||98%||97%||97%||96%||95%||95%||94%||93%||93%||92%||92%||91%||90% | | 1300||99%||99%||98%||97%||97%||96%||95%||95%||94%||93%||93%||92%||92%||91%||90% | ||
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1400||99%||99%||98%||98%||97%||96%||96%||95%||95%||94%||93%||93%||92%||92%||91% | | 1400||99%||99%||98%||98%||97%||96%||96%||95%||95%||94%||93%||93%||92%||92%||91% | ||
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1600||99%||99%||98%||98%||97%||97%||96%||96%||95%||95%||94%||94%||93%||93%||92% | | 1600||99%||99%||98%||98%||97%||97%||96%||96%||95%||95%||94%||94%||93%||93%||92% | ||
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1800||100%||99%||99%||98%||98%||97%||97%||96%||96%||95%||95%||94%||94%||93%||93% | | 1800||100%||99%||99%||98%||98%||97%||97%||96%||96%||95%||95%||94%||94%||93%||93% | ||
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2000||100%||99%||99%||98%||98%||97%||97%||97%||96%||96%||95%||95%||94%||94%||94% | | 2000||100%||99%||99%||98%||98%||97%||97%||97%||96%||96%||95%||95%||94%||94%||94% | ||
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Revision as of 14:43, 14 June 2018
How do MTBF figures relate to the percentage of items still working after a number of years. the tgable below provides the answer.
| Years/MTBF in 000 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 100 | 92% | 84% | 77% | 70% | 65% | 59% | 54% | 50% | 45% | 42% | 38% | 35% | 32% | 29% | 27% |
| 125 | 93% | 87% | 81% | 76% | 70% | 66% | 61% | 57% | 53% | 50% | 46% | 43% | 40% | 37% | 35% |
| 150 | 94% | 89% | 84% | 79% | 75% | 70% | 66% | 63% | 59% | 56% | 53% | 50% | 47% | 44% | 42% |
| 175 | 95% | 90% | 86% | 82% | 78% | 74% | 70% | 67% | 64% | 61% | 58% | 55% | 52% | 50% | 47% |
| 200 | 96% | 92% | 88% | 84% | 80% | 77% | 74% | 70% | 67% | 65% | 62% | 59% | 57% | 54% | -|- |
| 225 | 96% | 93% | 89% | 86% | 82% | 79% | 76% | 73% | 70% | 68% | 65% | 63% | 60% | 58% | 56% |
| 250 | 97% | 93% | 90% | 87% | 84% | 81% | 78% | 76% | 73% | 70% | 68% | 66% | 63% | 61% | 59% |
| 300 | 97% | 94% | 92% | 89% | 86% | 84% | 82% | 79% | 77% | 75% | 73% | 70% | 68% | 66% | 65% |
| 350 | 98% | 95% | 93% | 90% | 88% | 86% | 84% | 82% | 80% | 78% | 76% | 74% | 72% | 70% | 69% |
| 400 | 98% | 96% | 94% | 92% | 90% | 88% | 86% | 84% | 82% | 80% | 79% | 77% | 75% | 74% | 72% |
| 450 | 98% | 96% | 94% | 93% | 91% | 89% | 87% | 86% | 84% | 82% | 81% | 79% | 78% | 76% | 75% |
| 500 | 98% | 97% | 95% | 93% | 92% | 90% | 88% | 87% | 85% | 84% | 82% | 81% | 80% | 78% | 77% |
| 550 | 98% | 97% | 95% | 94% | 92% | 91% | 89% | 88% | 87% | 85% | 84% | 83% | 81% | 80% | 79% |
| 600 | 99% | 97% | 96% | 94% | 93% | 92% | 90% | 89% | 88% | 86% | 85% | 84% | 83% | 82% | 80% |
| 650 | 99% | 97% | 96% | 95% | 93% | 92% | 91% | 90% | 89% | 87% | 86% | 85% | 84% | 83% | 82% |
| 700 | 99% | 98% | 96% | 95% | 94% | 93% | 92% | 90% | 89% | 88% | 87% | 86% | 85% | 84% | 83% |
| 750 | 99% | 98% | 97% | 95% | 94% | 93% | 92% | 91% | 90% | 89% | 88% | 87% | 86% | 85% | 84% |
| 800 | 99% | 98% | 97% | 96% | 95% | 94% | 93% | 92% | 91% | 90% | 89% | 88% | 87% | 86% | 85% |
| 900 | 99% | 98% | 97% | 96% | 95% | 94% | 93% | 93% | 92% | 91% | 90% | 89% | 88% | 87% | 86% |
| 1000 | 99% | 98% | 97% | 97% | 96% | 95% | 94% | 93% | 92% | 92% | 91% | 90% | 89% | 88% | 88% |
| 1100 | 99% | 98% | 98% | 97% | 96% | 95% | 95% | 94% | 93% | 92% | 92% | 91% | 90% | 89% | 89% |
| 1200 | 99% | 99% | 98% | 97% | 96% | 96% | 95% | 94% | 94% | 93% | 92% | 92% | 91% | 90% | 90% |
| 1300 | 99% | 99% | 98% | 97% | 97% | 96% | 95% | 95% | 94% | 93% | 93% | 92% | 92% | 91% | 90% |
| 1400 | 99% | 99% | 98% | 98% | 97% | 96% | 96% | 95% | 95% | 94% | 93% | 93% | 92% | 92% | 91% |
| 1600 | 99% | 99% | 98% | 98% | 97% | 97% | 96% | 96% | 95% | 95% | 94% | 94% | 93% | 93% | 92% |
| 1800 | 100% | 99% | 99% | 98% | 98% | 97% | 97% | 96% | 96% | 95% | 95% | 94% | 94% | 93% | 93% |
| 2000 | 100% | 99% | 99% | 98% | 98% | 97% | 97% | 97% | 96% | 96% | 95% | 95% | 94% | 94% | 94% |