How should it be described in the operating instructions: slowly opening the control valve?
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How to describe a control valve being opened slowly?
Gradual, phased adjustment based on the reference point indication. Keywords should be reference points. Write down what the reference point is, such as a pressure, temperature, or flow gauge at a certain location.
It’s just a rough estimate; ultimately, it still relies on the operator’s experience. What was said upstairs is correct; the focus should be on describing the changes in various parameters during the opening process, such as the upper and lower limits as well as the rate of change, so that this can be used as a reference for determining the speed at which the valve is opened.
The so-called slowness is for safety’s sake. If it’s difficult to determine, the valve opening can be used as a measure. For example, how long to wait when it reaches 5%, and how long to wait when it reaches 10%. Wait
A continuous process is artificially divided into several key points; the more key points there are, the slower the operation becomes
There was an aromatic compound-related incident that caused a lot of sensation at the time, as the accident report indicated that it was caused by excessive valve opening. Using the excuse of slow opening is simply a way to shift responsibility. However, many operations in the chemical industry cannot be quantified due to numerous limitations; even with two identical sets of equipment, slight differences in liquefaction parameters can only be determined through trial and error. In short, when working in the chemical industry, don’t be afraid of trouble, and don’t rely on your opinions or assumptions
This can only be described roughly; a detailed description is not possible. Since everyone has a different pace of operation, if this were written down, some stubborn people might use the rules of the operating procedure as an excuse when something goes wrong