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Reliability block diagram templates

RBD — Hospital Medical Oxygen Supply

HTM 02-01 style piped oxygen supply with a warm-standby chain from VIE to reserve vessel to emergency cylinder manifold, plus duplicated alarm panels, computing annual supply reliability.

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Hospital medical oxygen supply — HTM 02-01Mission 8 760 h · 1.00 yr · 8 blocks · 2 redundant arrangements · R 0.904834warm standby · switch 0.990 · R 0.997154Vacuum insulated evaporatorR 0.852764 · A 0.99956VIE reserve vesselR 0.852764 · A 0.99956Emergency cylinder manifoldR 0.970000First-stage pressure regulationR 0.943273 · A 0.99997Copper pipeline distributionR 0.997084 · A 1.00000Area valve service unit — ITUR 0.978338 · A 1.00000parallel · R 0.986163Alarm panel, plant roomR 0.882371 · A 0.99989Alarm panel, switchboardR 0.882371 · A 0.99989System reliability0.904834Unreliability0.0952System MTTF54 329 h · 6.20 yrAvailability0.999960Reliability importance — Birnbaum ∂R/∂Rᵢ, with criticality share1First-stage pressure regulation0.959250crit 57%2Area valve service unit — ITU0.924869crit 21%3Copper pipeline distribution0.907480crit 2.78%4VIE reserve vessel0.132269crit 1.31%5Alarm panel, plant room0.107928crit 13%6Alarm panel, switchboard0.107928crit 13%7Vacuum insulated evaporator0.012620crit 2.71%8Emergency cylinder manifold0.010098crit 0.13%The availability figure of 0.999960 is computed over 7 of the 8 blocks in this arrangement. The other 1 state no `mttr:` and are fed in at availability 1 — perfectly available, for ever — so the number below is the avail…Weakest link: First-stage pressure regulation — R 0.943273, Birnbaum 0.959250, 57% of system failure. Improving this one block moves the system number further than improving any other.Redundancy check: removing any one of the 4 branches makes its own group measurably more likely to fail — the least of them by 38%. Every one of them is earning its place.

Make it your own.

title "Hospital medical oxygen supply — HTM 02-01"
mission 8760h

block vie      "Vacuum insulated evaporator"    mtbf: 55000h   mttr: 24h
block vieRes   "VIE reserve vessel"             mtbf: 55000h   mttr: 24h
block manifold "Emergency cylinder manifold"    r: 0.97
block firstSt  "First-stage pressure regulation" mtbf: 150000h mttr: 4h
block pipeline "Copper pipeline distribution"   mtbf: 3000000h mttr: 12h
block avsu     "Area valve service unit — ITU"  mtbf: 400000h  mttr: 2h
block alarmA   "Alarm panel, plant room"        mtbf: 70000h   mttr: 8h
block alarmB   "Alarm panel, switchboard"       mtbf: 70000h   mttr: 8h

# Three sources in strict order — liquid, reserve, then cylinders. The
# spares are warm: the reserve vessel boils off whether you use it or not.
series {
  standby warm { primary: vie; spares: vieRes, manifold; switch: 0.99 }
  firstSt
  pipeline
  avsu
  parallel { alarmA; alarmB }
}