Читать книгу Root Cause Failure Analysis - Trinath Sahoo - Страница 46

It is essential to clearly understand the design parameters and specifications of the systems associated with an event or equipment failure. Unless the investigator understands precisely what the machine or production system was designed to do and its inherent limitations, it is impossible to isolate the root cause of a problem or event. The data obtained from a design review provide a baseline or reference, which is needed to fully investigate and resolve plant problems.

The objective of the design review is to determine whether the machine is running within acceptable operating envelope. The condition of the machine and the process condition are being investigated. For example, a centrifugal pump may be designed to deliver 1OOO m³/h of water having a discharge Pressure of 20 kg/cm². If it is operated beyond this point, then the power will increase and due to running beyond design limit vibration may go up. The review should establish the acceptable operating envelope, or range, that the machine or system can tolerate without a measurable deviation from design performance. Evaluating variations in process parameters, such as pressures flow rate, and temperature, is an effective means of confirming their impact on the production system.