Instrumentation

Background In a 120,000 tons-per-year polyvinyl chloride (PVC) production facility, a critical incident occurred during the commissioning of newly installed valves on a liquid chlorine storage tank. The sudden shutdown was triggered by a tripped power supply circuit, which resulted in a full-scale plant stoppage and elevated the risk of hazardous chemical leakage. The root […]

Introduction In petrochemical production, automation instruments are the nervous system of the process. They play a critical role in ensuring operational stability, safety, and efficiency. Failures or inaccuracies in these instruments can lead to production losses or even severe safety hazards. This article presents a comprehensive methodology for troubleshooting typical issues in temperature, flow, pressure,

Introduction A Safety Instrumented System (SIS) is an independent system designed to prevent or mitigate hazardous events by automatically taking actions to bring a process to a safe state. Given the high risks associated with Level 1 Major Hazard Sources, determining whether an SIS is necessary requires careful evaluation of regulatory requirements, risk assessment results,

In industrial process control, accurate and reliable level measurement is essential for safety, efficiency, and automation. Among various types of level instruments, single-flange and double-flange differential pressure level transmitters are two commonly used solutions in industries such as petrochemical, pharmaceutical, and power generation. This article presents a detailed comparison of these two types of transmitters,

1. What Is an Electrical Schematic Diagram? An electrical schematic diagram (also known as a wiring diagram or circuit diagram) is a visual representation of an electrical system. It illustrates how various electrical components are connected and how current flows through the system. These diagrams serve as the foundational reference for electrical design, installation, commissioning,

1. Fundamental Differences 1.1 Function and Role Category Surge Protective Device (SPD) Lightning Terminal Core Function Limits transient overvoltages (such as lightning surges or switching transients) on power or signal lines. Ensures reliable electrical connection between lightning arrestors and grounding system to discharge lightning current safely. Target Directly protects electronic equipment or control systems from

Introduction Industrial automation instruments, including pressure, flow, temperature, level, and composition analyzers, are critical for ensuring safe, stable, and efficient operations in modern production facilities. Effective lifecycle management of these instruments not only ensures operational continuity but also enhances product quality and economic returns. This document outlines 17 structured modules for managing the full lifecycle

Introduction Safety Instrumented Systems (SIS) are critical to ensuring process safety in high-risk industries such as petrochemicals, oil and gas, and power generation. A key consideration in SIS architecture is the configuration of operator stations (HMI) and engineering stations. This article addresses two common questions in SIS design: Can the operator and engineering stations be

Explosion-proof systems, especially in hazardous environments, demand a meticulous approach to ensure safety and compliance with regulations. This article outlines the essential principles for connecting explosion-proof distribution boxes with galvanized pipes, providing practical details and best practices for effective implementation. 1. Requirements for Explosion-Proof Piping Installation The installation of explosion-proof pipelines requires higher standards compared

Instrument air (IA) is a critical utility in industrial environments, providing clean, dry, and stable compressed air to pneumatic instruments, control valves, and other automation devices. Proper management and maintenance of the instrument air system are essential for ensuring the reliability and longevity of your equipment. Basic Requirements for Instrument Air Pressure Range:Typically maintained at