5.1 - Introduction to Peurifoy's Method
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Ownership Costs
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Today's lesson is about estimating ownership costs. What do you think is included in ownership costs?
Probably the purchase price of the equipment?
Yes, that's correct! Ownership costs include not only the purchase price but also depreciation, interest, insurance, and taxes. Can anyone tell me how we might calculate depreciation?
Isn't it based on the initial cost minus the salvage value divided by useful life?
"Exactly! Remember the formula:
Operating Costs
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Now that we understand ownership costs, let's move to operating costs. What types of expenses do you think are included?
I think fuel costs would definitely be one.
And also wages for operators!
Exactly! Let's break it down: operating costs include fuel, labor, tire wear, and maintenance. How would we estimate fuel costs?
Is it based on fuel consumption and cost per liter?
Right again! For example, if the truck consumes 0.09 liters per horsepower, and it has 250 horsepower, with fuel costing ₹65 per liter, what’s the fuel cost?
That would be ₹1462.50 per hour.
Great job! Remember, adding all these together gives us the total operating costs.
Total Cost Calculation
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Now that we have ownership and operating costs, how do we determine the total cost to operate a piece of equipment?
Do we just add the two costs together?
Yes! The total cost is the sum of ownership cost, operating cost, and operator wages. Can anyone compute this using our truck example?
You would add the hourly ownership cost of ₹2713, the operating cost of ₹3209.29, and operator wages of ₹200.
Exactly! What do you get?
A total of ₹6122.29 per hour!
Perfect! To summarize, knowing how to estimate equipment costs helps in the overall project budgeting.
Peurifoy's Method Implications
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Let's talk about the significance of Peurifoy's Method. Why do you think it is crucial in construction management?
It helps ensure accurate cost estimations for project budgeting.
Correct! Accurate estimations can lead to better financial planning. Does anyone know the potential issues that could arise without accurate estimations?
There could be budget overruns or project delays if the costs are underestimated.
Absolutely! Remember the quote: 'A budget provides a plan, but accurate estimations give clarity.'
Can we reduce the risk of inaccuracies?
Yes, by regularly updating cost data from reliable sources and adjusting your estimations accordingly!
So we should keep referring back to estimation handbooks?
Exactly! That’s a great takeaway. Let’s summarize today's learning about Peurifoy’s Method and its role in making informed decisions.
Introduction & Overview
Read summaries of the section's main ideas at different levels of detail.
Quick Overview
Standard
In this section, we explore Peurifoy's Method for calculating equipment costs, which includes ownership costs, operating costs, and methodologies for estimating economic costs through examples involving machinery such as dump trucks. Key considerations include depreciation, interest, insurance, fuel costs, and repair factors.
Detailed
Peurifoy's Method fundamentally aims to provide a structured approach to equipment cost estimation, encompassing ownership and operating costs. It starts by summing ownership costs, which include the initial price minus tire costs and depreciation, with operating costs that incorporate fuel, labor, and maintenance expenses. The method exemplifies these principles through a case study involving an off-highway dump truck, detailing how to arrive at total costs by using specific formulas and assumptions regarding annual usage, cost percentages, and applicable adjustments. The section highlights the necessity of accurate data from estimation handbooks and provides a comprehensive breakdown of each costing factor, emphasizing why such methodology is essential in construction engineering.
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Total Cost Calculation
Chapter 1 of 5
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Chapter Content
So just add up everything the ownership cost all the operating cost and operating wages also you will get the total ownership and the operating cost following the Peurifoy guidelines.
Detailed Explanation
In this chunk, the main idea is to calculate the total cost of using a piece of equipment by adding together various costs. These costs include ownership costs (such as depreciation, insurance, and interest) and operating costs (like fuel, maintenance, and labor). The Peurifoy method provides guidelines on how to systematically estimate these costs to get a total cost figure, which is essential for budgeting and financial planning in equipment-intensive projects.
Examples & Analogies
Imagine you are planning to buy a car. To calculate the total cost of ownership, you would consider not only the purchase price but also the cost of insurance, fuel, maintenance, and repairs. Similarly, the Peurifoy method works for estimating costs of equipment in construction projects by factoring in all these expenses.
Understanding Off-Highway Trucks
Chapter 2 of 5
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Chapter Content
In this problem, you can estimate the cost for the dump truck. It is an off-highway truck, why we call it as off-highway? This truck is not permitted on the public highways.
Detailed Explanation
Off-highway trucks are specialized vehicles designed for use in construction sites and other locations where normal road regulations do not apply. This chunk explains the distinction of these trucks from regular vehicles, emphasizing their role in heavy-duty applications where they face significantly different operational conditions from vehicles that operate on public roads.
Examples & Analogies
Think of a mining operation where large dump trucks carry heavy loads of rock. Unlike regular cars that drive on highways, these dump trucks operate on rugged terrain and are built to endure much harsher working conditions, similar to how a specialized forklift is designed for warehouses rather than road transport.
Initial Cost and Assumptions
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The initial cost is given so it was purchased with the deliver price of 3 crores. So you can imagine it is already high-end equipment with special features like you can see it will be kind of articulate machine with any additional features.
Detailed Explanation
This section provides an initial cost of a dump truck, valued at 3 crores, indicating that it is sophisticated machinery. The initial cost is crucial for calculating depreciation later on. The explanation highlights that this cost reflects not just the purchase price but also specialized features that higher-end equipment typically has to meet specific operational needs.
Examples & Analogies
Consider purchasing a high-tech smartphone that costs significantly more than a basic model. The higher price includes advanced features like better cameras, more storage, and faster processing speeds, similar to how expensive construction equipment comes with features designed for heavy-duty use.
Cost Breakdown and Operating Costs
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Chapter Content
The requirements are according to the type of the machine for which you are going to estimate. You can choose the appropriate estimation handbooks and choose the values estimated accurately.
Detailed Explanation
This chunk emphasizes the need to understand the machine type when estimating costs. Different equipment has specific operational requirements, so choosing the right estimation handbooks and data sources is crucial for accuracy. It points to the importance of utilizing industry standards and established guidelines to support cost estimation for various construction machinery.
Examples & Analogies
When creating a recipe, having the right ingredients is key. If you’re baking a cake, you need correct measurements for flour, sugar, and eggs. Similarly, accurate cost estimation in construction involves having the right data and references to get the expected costs for the specific machinery being used.
Annual Use and Projected Costs
Chapter 5 of 5
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Chapter Content
The truck is expected to have annual use of 1600 hours. It depends upon every day how many hours it is operating.
Detailed Explanation
The planned usage of the truck for a specified number of hours annually is a critical input for calculating hourly rates for depreciation and operating costs. This chunk shows how variability in daily operational hours affects overall estimates, therefore careful tracking of actual hours worked can lead to more precise cost assessments over time.
Examples & Analogies
Just like a rental car service that charges customers based on the hours a car is used, equipment costs are also calculated based on how long they are operated. If cars are used longer, the rental costs increase. Similarly, the more hours a piece of equipment is used, the higher its operating costs will be.
Key Concepts
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Ownership Cost: The total cost involved in owning equipment, including depreciation and interest.
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Operating Cost: The expenses that occur during the usage of equipment, such as fuel and wages.
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Depreciation: Calculating the decrease in value of an asset to determine annual costs.
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Economic Cost: The sum of ownership and operating costs contributing to total project cost.
Examples & Applications
Estimating the ownership and operating costs of a dump truck that has a purchase price of ₹3 crores and operates for 1600 hours annually.
Calculating the total economic cost by adding ownership costs (₹2713/hr) and operating costs (₹3209.29/hr) along with labor costs.
Memory Aids
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Rhymes
For ownership costs think of expenses that sway, depreciation and taxes are here to stay.
Stories
Imagine a giant dump truck working all day long, its costs add up with each round it throngs – from fuel to maintenance, each aids its song.
Memory Tools
To remember components of equipment costs: O P E R A T E (Ownership, Purchase, Expenses, Repair, Annual cost, Tire, and Energy costs).
Acronyms
C.O.S.T. (Calculation of Operating and Structural Total) for estimating equipment costs.
Flash Cards
Glossary
- Ownership Cost
The sum of all costs associated with owning equipment, including purchase price, depreciation, interest, insurance, and taxes.
- Operating Cost
Costs incurred during the operation of machinery, including fuel, labor, and maintenance.
- Depreciation
The reduction in the value of an asset over time, calculated based on the initial cost, salvage value, and useful life.
- Caterpillar Method
A method for estimating equipment costs based on ownership and operating cost calculations.
- Peurifoy's Method
An approach to estimating equipment costs that emphasizes accuracy and reliable data sources, prominently used in construction management.
- Economic Cost
The total cost of using equipment, combining ownership and operating costs.
- Annual Repair Cost
The expected costs associated with maintenance and repairs of the machinery over a year, often a percentage of initial cost.
- Salvage Value
The estimated residual value of an asset at the end of its useful life.
Reference links
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