Vortex flow meters are widely used for steam flow measurement because of their stable performance, simple structure, and low maintenance requirements. However, in many industrial applications, users may notice that the flow reading fluctuates significantly when measuring steam. In most cases, this phenomenon is not caused by instrument failure. Instead, it is usually related to […]
In discussions about plant safety, you might hear terms like “alarms, interlocks, and safety valves.” However, true safety assessment goes beyond simply asking, “Do we have these systems?” It involves answering three crucial questions: What potential issues could occur? (Scenario Identification) Is the risk low enough? (Risk Assessment) If not, how reliable do the protection
Understanding the Differences Between HAZOP, LOPA, and SIL in Process Safety Read More »
Negative pressure in pipelines refers to the condition where the pressure inside the pipeline is lower than atmospheric pressure. This is a common yet often underestimated issue in engineering. In real-world operations, negative pressure can lead to a range of serious consequences, including: Pipe collapse or deformation Equipment damage due to excessive suction Infiltration of
Key Factors for Thermocouple Selection (Prioritized) Temperature Range (Primary Consideration) The temperature range determines the selection of the thermocouple type. The type should cover 1.2 times the maximum temperature (JB/T 5582-2015): Ultra-Low Temperature (-270 to -40°C): Type T (Copper-Copper Nickel), high precision for low temperatures. Low Temperature (-40 to 400°C): Type T (stable) and Type
Thermocouple Selection Guide (Industrial Practical Version) Read More »
An actuator’s dead zone refers to the range of input signals where the actuator does not respond. Only when the input signal reaches a certain threshold does the actuator begin to operate. When the dead zone becomes too significant, it may lead to oscillations in the control system, degrading the system’s performance. In industrial automation
Actuator Dead Zone: Definition, Causes, and Impacts Read More »
Electromagnetic flowmeters operate based on Faraday’s law of electromagnetic induction and are used exclusively for conductive liquids (conductivity ≥ 5 μS/cm). In the chemical industry, the core focus of selection revolves around medium compatibility, operating conditions, accuracy/signals, installation/explosion-proof requirements, and structural/functions. Below are practical selection rules specifically for chemical industry scenarios. 1. Prerequisites: Determining Medium
Electromagnetic Flowmeter Selection Guide (Comprehensive Explanation) Read More »
The HART (Highway Addressable Remote Transducer) protocol is a hybrid communication standard widely used in industrial automation. By combining analog and digital communication, HART enables seamless integration between smart devices and traditional control systems. This article explores the working principle of the HART protocol, its advantages, limitations, and its application across industries. 1. Working Principle
1. Comparison of the Performance Advantages and Disadvantages of the Top Ten Types of Control Valves Control valves can be categorized into ten main types. How do the nine key functional aspects compare across these types? To streamline the information, the following table summarizes the performance scores for the common types of control valves based
Comparison and Selection Guide for the Ten Types of Control Valves Read More »
Properly setting alarm values can prevent safety accidents. So, how should we set these alarm values? For example, consider a tank with a level control limit of 80%. What would be the appropriate alarm value? 70%? 75%? Or 78%? To correctly set alarm values, we first need to understand one key concept: response time. The
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1. Glass Level Gauge in the Mother Liquid Tank Shows Changes, but Remote Level Display Does Not Change for an Extended Period Fault Diagnosis: It is suspected that the sampling pipe might be clogged. On-site inspection reveals that the liquid-phase pipe is blocked. Fault Resolution: Close the sampling valve and clear the blockage in the
How to Handle Slow or No Level Changes in Float Level Meters Read More »
