A group of empirical equations were developed in order to estimate the performance curves (H Q, n Q, P -Q, NPSHr -Q) of a centrifugal pump, using quite small amount of pumps geometric data. The results of the present study prove that centrifugal pumps performance curves direct estimation could be accomplished without using complex mathematical models. Furthermore more, all-basic parameters affe...

The internal flow problem of a reversible pump turbine restricts its safe and stable operation. Among them, the influence guide vane on field is very crucial. flow–head relationship great significance in performance stability unit. In this study, characteristics under different rates were analyzed for opening angles. By comparing results model test computational fluid dynamics simulation, it wa...

The coronary Bypass operation at the beating heart ("off-pump surgery") is a new procedure which promises advantages in comparison to the established procedure with uses a heart-lung machine ("on-pump-surgery"). In the presented HTA report cardiac surgery the question is investigated, whether there are advantages of the off-pump-surgery in comparison to the on-pump-surgery regarding medical eff...

Narayani Lift Irrigation System is one of the oldest lift irrigation systems in Nepal, constructed 1982. The machines used are as old project and, some were maintained and still operation. study focuses on operation assessment System. Field visits with a checklist, Questionnaire survey, Key informant interviews main methods data collection. was analysed using Relative Importance Index descripti...

the conventional method towards deriving schedule for a fleet of ships to minimize cost alone has the short-coming of not addressing the problem of operation revenue losses associated with delays during maintenance at ships dockyards. in this paper, a preventive maintenance schedule for a fleet of ships that incorporates op-portunity cost is presented. the idea is to assign a penalty cost to al...

Software maintenance is generally used to refer the changes that are made to software after its initial release, installation and operation. In several research it has proven that maintenance involve more than 40 percent of the total cost of the software. External quality factors assessments were always in light from the beginning of the software engineering research and related to internal qua...

scheduling has become an attractive area for artificial intelligence researchers. on other hand, in today's real-world manufacturing systems, the importance of an efficient maintenance schedule program cannot be ignored because it plays an important role in the success of manufacturing facilities. a maintenance program may be considered as the heath care of manufacturing machines and equip...

One of the key requirements for reliable operation of a water supply system is a thorough analysis and proper selection of the control valves and pumps. For valves, selection criteria includes capacity, pressure loss, controllability, torque, cavitation and transients. Pump selection requires matching the pump performance to varying system demands. Examples are given for single pump operation a...