Posts tagged 'Simple Saturdays'

Override Control

I do not think that we covered override control loops while at university, the first time I came across them was in the sugar factory. Yet they are used a lot and are incredibly useful. I don't understand why they aren't covered in introductory control classes.

Override control ...

The Cascade Loop

Most control loops try to keep whatever is measured at a value set by the operator (SetPoint, SP). Sometimes the operator lets something else decide the setpoint. This is called cascade.

In most cases this means two control loops work together. The output of the first decides the setpoint of ...

The PID Loop

In last week's edition of Simple Saturdays, I talked about control loops. This week I will talk about the PID loop. Unlike many explanations of the PID loop, I will keep it simple. I will avoid showing the equation that a controller uses. The truth is that as a ...

What is a Control Loop?

The way we manage to get our factories to make the things we want them to is by getting liquids to flow various pipes at the right speeds, by making sure they are at the correct temperature. We need to ensure tanks don’t overflow and the pressure inside is ...

What is Partial Pressure?

In the first of my simple Saturday posts, I will cover the term partial pressure. This term is critical to much of chemical engineering and I was very familiar with it during my time at university. But once I graduated and worked in a sugar factory, I didn't use ...

Simple Saturdays: Introduction

I dislike the amount of jargon we tend to use in our daily work lives. We use acronyms like CCR (central control room) rather than just saying "control room". We refer to equipment tags like P101 rather than simply describing the equipment like "feed pump". It is not as if ...