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Reliability block diagram templates

RBD — Subsea Multiphase Boosting Station

Six-month intervention window for a subsea boosting station: shared umbilical, dual control modules and two full VSD-plus-pump trains, with repair times set by vessel mobilisation.

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Subsea multiphase boosting stationMission 4 380 h · 183 d · 9 blocks · 2 redundant arrangements · R 0.855115Power / control umbilicalR 0.977211 · A 0.99622parallel · R 0.997744Subsea control module AR 0.952499 · A 0.99469Subsea control module BR 0.952499 · A 0.99469parallel · R 0.945523Topside VSD AR 0.907254 · A 0.99973Boosting pump AR 0.844964 · A 0.94752Topside VSD BR 0.907254 · A 0.99973Boosting pump BR 0.844964 · A 0.94752Barrier fluid systemR 0.929601 · A 0.99602Production flowlineR 0.997812 · A 0.99892System reliability0.855115Unreliability0.1449System MTTF16 577 h · 1.89 yrAvailability0.988401Reliability importance — Birnbaum ∂R/∂Rᵢ, with criticality share1Barrier fluid system0.919874crit 45%2Power / control umbilical0.875057crit 14%3Production flowline0.856990crit 1.29%4Boosting pump A0.191509crit 20%5Boosting pump B0.191509crit 20%6Topside VSD A0.178360crit 11%7Topside VSD B0.178360crit 11%8Subsea control module A0.040711crit 1.33%+1 more blocks not shownWeakest link: Barrier fluid system — R 0.929601, Birnbaum 0.919874, 45% 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 328%. Every one of them is earning its place.

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title "Subsea multiphase boosting station"
mission 4380h                # six months between intervention windows

# MTTRs are dominated by vessel mobilisation, not by the repair itself —
# 1440 h is sixty days waiting on weather and a light well intervention.
block umbilical "Power / control umbilical" mtbf: 190000h  mttr: 720h
block scmA      "Subsea control module A"   mtbf: 90000h   mttr: 480h
block scmB      "Subsea control module B"   mtbf: 90000h   mttr: 480h
block vsdA      "Topside VSD A"             mtbf: 45000h   mttr: 12h
block vsdB      "Topside VSD B"             mtbf: 45000h   mttr: 12h
block pumpA     "Boosting pump A"           mtbf: 26000h   mttr: 1440h
block pumpB     "Boosting pump B"           mtbf: 26000h   mttr: 1440h
block barrier   "Barrier fluid system"      mtbf: 60000h   mttr: 240h
block flowline  "Production flowline"       mtbf: 2000000h mttr: 2160h

series {
  umbilical
  parallel { scmA; scmB }
  parallel {
    series { vsdA; pumpA }
    series { vsdB; pumpB }
  }
  barrier
  flowline
}