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Revamps: Strategies for A Smooth Turnaround

By Ray Elshout Energy Systems Engineering Dan Garcia Sun Engineering Services |

Meanwhile, the revamp opportunities that a turnaround provides are, themselves, few and far between. Petrochemical refineries, for instance, typically try to get five years between major turnarounds to maximize on-stream time. Some equipment can be connected before an actual shutdown, but most of the so-called tie-ins must fall into place during the turnaround, which usually lasts only 20–50 days. Since the typical duration for the design, production and construction of a major revamp can take a year or longer and involves many stages (see box, Project Stages, p. 37), advanced planning is critical. Equipment with long lead time must to be ordered well in advance of the date required onsite, and engineering has to be contracted-out well in advance to find a quality engineering contractor with the experience required to execute the project without rework. Planning for shutdown Shutdown plans have to be well organized so that all the work dovetails within the allotted shutdown period. Figure 1 shows a portion of a typical project schedule. FIGURE 1. This example schedule breaks down the activities into a large number of steps, each of which has an early start date and last-possible completion date to keep it from becoming schedule…
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