Assessing the Impact of Virtual Standby Systems in Failure Propagation for Complex Wastewater Treatment Processes

Table 5

Simulation results-VSB scenario.

Equipment/system	Performance indicators
	Mean % availability	Mean % oper. time	Mean processed WW (MGD)	MTTF (hours)	MTTR (hours)
Primary treatment process	86.62	89.72	8.08	11.13	1.72
Standby bar screening^1	97.24	89.72	8.08	93.44	3.53
BS_001	96.68	89.72	7.97	45.88	1.4
BS_002^2	26.97	89.72	0.11	0.48	1.3
Standby grit chamber^1	96.43	89.72	8.08	76.63	3.29
GRIT_001	96.19	89.72	7.99	68.86	2.4
GRIT_002	21.15	89.72	0.09	0.59	2.2
PUMP_001	95.76	89.72	8.08	28.75	1.2
CLAR_002	96.47	89.72	8.08	98.42	3.2

¹Two new subsystems (standby configuration) are recognized, representing the integration of the main and virtual equipment. The creation of these new subsystems is needed according to evaluation of the resilience operational impact over the indicators of interest. ²This virtual equipment approaches the impact of resilience condition on the main system and subsystems.