Unscheduled shutdowns and process efficiency

Unscheduled shutdowns

and process efficiency

The process of pumping liquids and controlling these with valves is a carefully designed one where parameters such as flow rates, pressures, temperatures and a host of other factors are carefully monitored, measured and controlled.

On plants designed to run as 24-hour operations, like wastewater treatment works, any sudden or unscheduled shutdown could place unexpected strain on the system. For this reason, the starting and stopping/shutdown of process plant equipment should always adhere to original equipment manufacturer specifications. However, where unscheduled stoppages do occur, it is important to troubleshoot the system to check for possible faults. Preventative maintenance may be required.

“Performance can be severely impacted and even a single digit decrease in the system’s productivity can have a vastly detrimental effect on a company’s bottom line,” explains Hugo du Plessis, senior project engineer, KSB Pumps and Valves.

10 KEY MAINTENANCE CHECKPOINTS

• Mechanical pump seals • Bearings • Suction and discharge pump casings and flanges • Valves and valve seals • Control instrumentation • Performance curves • Pump impellers (corrosion) • Ensure paperwork is updated for improved reporting • Overall condition of piping • Instrumentation, gaskets and elastomers (e.g. manometers, flow switches, temperature probes, accelerometers, etc.) Hugo du Plessis, senior project engineer, KSB Pumps and Valves

Recommission the pump circuit

“As plants are brought back into operation, it is necessary to recommission the pump circuit to be sure it is optimal. This investment in time can prevent further problems down the line,” he continues.

“Hardening of materials, corrosion, leaks, etc. can start during these times and are best dealt with up front. The medium being pumped also dictates how long materials can be stationary before deteriorating the system. It is probably a good idea to have an audit of your system to ensure it is still optimal,” adds Du Plessis.

KSB Pumps and Valves is a leader in the supply of pumps, valves and services for almost every application. The company’s products range from water pumps to advanced petrochemical and pumping systems for energy, mining, industry, waste handling and other applications.

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