In the chemical industry, measuring the liquid level in sodium hydroxide (caustic soda) storage tanks has long been a challenging issue. Due to its strong corrosiveness, tendency to crystallize, and steam emissions, traditional instruments often “fail” in such conditions. In this article, we’ll explore how to address this challenge. Key Physical Parameters for Monitoring Sodium […]
This seemingly simple question has caused confusion for many companies and designers. Some choose to install cut-off valves, while others don’t, with practices varying widely. But what do the standards say? Are there clear requirements in the regulations? In this article, we will clarify the principles for the installation of cut-off valves in safety valve
Should a Cut-off Valve Be Installed in the Inlet and Outlet Pipelines of a Safety Valve? Read More »
Components of Process Control Instruments Transmitter UnitThe transmitter unit converts measured parameters (such as set parameters in an automatic control system) into standardized signals for indication, recording, or control. Common types of transmitters include pressure transmitters, differential pressure transmitters, flow transmitters, temperature transmitters, differential temperature transmitters, and level transmitters.Transmitters can be categorized into two types
Components of Process Control Instruments Read More »
RF Capacitance (or RF Admittance) Level Switches are vital instruments for industrial liquid level measurement. The core principle behind their operation is based on changes in capacitance. A rod-type RF capacitance probe measures the change in capacitance between the probe and the container wall to determine the level, ensuring reliable liquid level monitoring. Although this
1. Abnormal Cumulative Flow in Mass Flow Meter Troubleshooting: A mass flow meter at a plant showed cumulative flow even when there was no process flow. Upon inspection, it was found that the supports at both ends of the sensor did not meet installation requirements. Specifically, the support distances were uneven, and the bottom of
In industrial settings, it’s common to hear statements like: “The equipment is still running, why shut it down?” “If we shut it down now, who will bear the loss?” “It was just repaired last year, why is it failing again?” These questions are heard every day. But what’s more difficult is the aftermath of an
Common Challenges Faced by Engineers: Should Equipment Continue Running or Be Shut Down? Read More »
In industrial settings, there’s a dangerous “knee-jerk” reaction that can be costly: Whenever the pressure transmitter readings fluctuate, technicians often suspect the device is faulty and immediately request a replacement. What happens next? A new transmitter is installed, but within a few days, the same “drift” occurs again. Engineer Li, with years of experience in
Is Your Pressure Transmitter Really Faulty? In Most Cases, It’s Innocent Read More »
Thermal mass flow meters, commonly used for measuring the mass flow rate of gases or small amounts of liquids, may experience significant fluctuations, leading to unstable readings that can impact process control. The causes of such fluctuations should be investigated from multiple aspects, including the properties of the medium, instrument installation, equipment parameters, and external
Reasons and Solutions for Large Fluctuations in Thermal Mass Flow Meters Read More »
When engineers first look at a piping or P&ID drawing, one thing becomes immediately noticeable:there are not many words, but there are many letter combinations. These letters are what we commonly call valve and piping codes.At first glance, they may look complicated, but in reality, they are simply a compact way of expressing technical information.
Understanding Valve and Piping Codes in Engineering Drawings Read More »
Understanding DN, D, De and Ø in Engineering Practice In many projects, pipes and flanges fail to fit during installation. This problem is often attributed to poor communication, purchasing mistakes, or site workmanship.However, from an engineering and inspection perspective, the root cause is usually much deeper — and far less intuitive. DN itself is not
Why DN Alone Is Not a Real Pipe Size Read More »
