Reliability block diagram
Reliability block diagrams with the reliability actually computed: series, parallel, k-out-of-n and standby arrangements over blocks carrying R, MTBF or failure rate, evaluated to system reliability, MTTF and availability at a chosen mission time. Redundancy that buys nothing shows up as a branch that moves the system number by a rounding error — which is the entire point of drawing one.
In the same space
Most users come to Reliability block diagram from ReliaSoft BlockSim, Isograph Availability Workbench or Visio RBD drawings. flowss runs this engine in the browser — no install, shareable via URL, exportable to PNG / SVG / PDF / source.
Syntax at a glance
mission 8760h
block grid "Grid supply" mtbf: 4000h
series {
grid
parallel { ups1; ups2 }
}Paste this in the Studio code pane to see Reliability block diagram render live. The full grammar is at the upstream-docs link above.
Sample templates
All 13 →Utility feed backed by a cold-standby generator pair, 2N UPS strings and 2-of-3 PDUs, computing annual system reliability, MTTF and availability for the rack busway.
Triplex air data, duplex flight control computers and two independent hydraulic-plus-actuator lanes over a year of utilisation, ranking which redundancy actually moves the loss-of-pitch-control number.
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.
Ten-year design life of a geostationary communications payload: cold-standby receiver, 3-of-4 travelling-wave tube amplifiers, output multiplexer and a cross-strapped TT&C transponder pair.
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.
Six-month traction availability for a regional line: grid supply point, paralleled feeder substations, overhead line, pantograph and a 3-of-4 traction converter group on the unit.
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