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In the early stages of a plant construction project, one of the most frequent questions from management or clients is, "How much will it cost?" However, the accuracy of a cost estimate varies significantly depending on the project phase. To standardize these estimates, the AACE International (Association for the Advancement of Cost Engineering) provides a widely recognized classification system. In this article, we will explain the relationship between project phases and cost estimation accuracy based on the AACE classification. What is CAPEX? In plant engineering, CAPEX (Capital Expenditure) refers to the total funds required to design, procure, and construct a ...

In this article, we will explain the differences between a Pressure Safety Valve (PSV) and a Pressure Relief Valve (PRV). Often, both are collectively referred to as "safety valves" because their fundamental purpose—releasing pressure from within a system—is the same. However, depending on the design philosophy of the manufacturer or engineering company, they are sometimes clearly distinguished. In such cases, they may even be assigned different symbols or tag numbers on a P&ID (Piping and Instrumentation Diagram). When they are distinguished, the difference lies primarily in their installation purpose and valve operation. From the next section onward, we will dive ...