4.1. Purchase and Use

So, equipment life: So, basically there are different phases in the equipment life as everyone knows. So, it starts with the purchase of the machine. We purchase the machine first, then we start using it. As we use it, with age, of the machine ages, you can say that the machine will be subjected to more amount of wear and tear. So, once it is totally worn out, when it comes to the end of the useful life of the machine, we go for the replacement of the machine.

The life cycle of equipment can be broken down into several key phases: purchase, use, wear and tear, and eventual replacement. It begins when an organization buys a machine. Over time, as the machine is used, it experiences wear and tear due to its operational demands. Eventually, when the machine no longer performs adequately, often due to significant wear or deterioration, it reaches the end of its useful life and needs to be replaced with a new machine.

Think of a car. When you purchase a car, you start using it, and as the years go by, it gets more wear and tear from driving. Eventually, when repairs become costly and the car isn't functioning as it should, you decide to trade it in for a new model. Just like the car example, equipment in construction goes through a similar lifecycle from purchase to replacement.

So, for a profitable equipment management, there are certain decisions which are very important. So, once this decision is a replacement decision. Whether to replace your old machine with a new machine or not, if at all you decide to replace then to make the replacement. So, what is the optimum replacement time? So, these 2 are very important questions or these 2 are the important decisions which are to be made accurately from profitable equipment management perspective.

In managing equipment efficiently, two crucial decisions arise: whether to replace an old machine and, if so, when to do it. The goal is to maximize profitability. Knowing when to replace machinery ensures that expenses do not exceed income, leading to better financial results.

Consider a food truck business. If the truck (equipment) gets old and frequently breaks down, the owner has to decide whether to keep repairing it or invest in a new truck. If repairs are causing significant delays in service and losing customers, waiting too long to replace it could be financially damaging, just like delaying decisions in managing construction equipment can impact project profitability.

Because as the age of the equipment increases, it may have worn out or it might have become totally obsolete because so many new competitive models would have come into the market with a better productivity and even lower maintenance and repair cost and with a lower operating cost.

As machines age, they may not only wear out but also become obsolete. This is due to the introduction of newer models that offer advanced features, improved performance, and lower costs. The outdated machine may still function, but it is often less effective and more expensive to maintain than replacing it with a more efficient model.

Think of an old smartphone versus a new one. The old phone works, but it may lag in performance, lack updated features, and cost more in repairs than purchasing a new model. Similarly, older equipment in construction may still be operational, but it might not compete with newer, more efficient machines.

So, what is this economic useful life, I will be discussing more in detail in the upcoming slides. Basically, economic useful life is the time period during which the cost associated with the machine is minimum. The total cost, the cumulative total cost associated with the machine is minimum.

The economic useful life of a machine is defined as the duration during which operating and maintenance costs are at their lowest while producing positive returns. It highlights the importance of replacing equipment just before costs begin to rise significantly, ensuring continued profitability.

Picture a college student renting a textbook. They need it just for one semester. If they continue to hold onto it for too long, late fees increase and its value diminishes. In a similar way, understanding the economic useful life helps businesses time their investment in equipment to avoid unnecessary costs and maximize value.

So, once you have decided to replace your machine, so, we have to look for alternatives. What are the alternative machines available in the market to replace my current machine in the project site? So, there are some terminologies we need know. The currently installed machine of the project site that is called as defender, any currently installed equipment or the asset; we call it a defender and the proposed equipment which you are considering for the replacement, the potential replacement that is called as a challenger.

After deciding on a replacement, it's essential to explore available alternatives. The old machine is referred to as the 'defender,' and any potential new machine under consideration is called the 'challenger.' The next step is to evaluate the costs and benefits associated with switching to a challenger to ensure a sound decision.

In sports, think of a starting quarterback (defender) on a football team being compared to a promising rookie (challenger). The team analyzes which player will perform better in games. Similarly, in construction, it's crucial to evaluate if a new machine (challenger) will outperform the old one (defender).

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