Integrated Model for Optimizing Strategic Overhaul Planning of Distributed Pump Stations

• Published in: Journal of computing in civil engineering Vol. 25; no. 4; pp. 275 - 282
• Main Authors: Pascual, R, Rey, P. A, Hodkiewicz, M, Cruz, C
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01.07.2011
• Subjects: Applied sciences; Budgeting; Buildings. Public works; Computation methods. Tables. Charts; Costs; Distribution. Storage; Economics; Energy costs; Exact sciences and technology; Maintenance costs; Mathematical models; Pump stations; Pumps; Structural analysis. Stresses; TECHNICAL PAPERS; Water collecting, well, pumping; Water supply. Pipings. Water treatment; Degrading operational efficiency; Sensitivity analysis; Life cycle (environment); Water distribution systems; Ageing; Aging (material); Shop maintenance; Pumping station; Overhaul; Water distribution; Maintenance; Aging water networks; Pumping stations; Modeling; Optimization; Case study; Efficiency; Finite time horizon; Formulation; Planning; Mathematical model; Life cycles
• ISSN: 0887-3801; 1943-5487
• DOI: 10.1061/(ASCE)CP.1943-5487.0000085

An important part of the lifecycle costs for pump stations are the support costs associated with energy and preventive maintenance of the pumps. Both cost terms are interrelated because a trade-off exists between maintaining pumps frequently (with increased pump efficiency, reduced energy costs and increasing maintenance costs, and pump unavailability) and extending the intervals between the overhauls (increased loss of efficiency, increased energy costs, and decreased maintenance costs). The planner needs to forecast pump overhaul demands to determine budget levels because economic resources are limited. This process is assisted by using mathematical programming methods to prioritize funding for equipment requiring renewal in consideration of limited resources in a strategic time horizon (several years). This work proposes an efficient model to define an overhaul maintenance program for a pump network with a large number of pumps (a few hundred in the case study). The model minimizes the discounted total (energy+overhaul) cost by selecting and scheduling pumps for overhaul subject to budget constraints. The formulation uses 0–1 integer programming.