How to Build the Internal Case for a Plant Equipment Purchase

A complete internal case for a plant equipment purchase contains six things: a clear statement of the problem and its current cost; a scope that says exactly what is being bought and what is not; the full cost of implementation, including installation, commissioning, and freight; the savings, split into energy, labor, and avoided downtime, each with the arithmetic shown; a payback figure, plus net present value if the purchase is large enough to compete with other capital projects; and a schedule that fits the next shutdown window with long-lead items ordered first. It also needs to be classified correctly from the start as either a capital request or an MRO expense, because those usually go through different approval paths. Get those six pieces onto one or two pages, back every number with a source finance can check, and the request stops being a maintenance opinion and becomes a business decision. The rest of this article covers how to build each piece.

Start with the problem, not the equipment

The U.S. Department of Energy's Energy Matters newsletter published a nine-part outline for presenting an efficiency project to management: state the purpose, state the problem, describe the scope, state the benefits, state the implementation cost, explain the effect on operations, present the budget effect and return on investment, provide an implementation plan, then summarize and ask for the decision. That sequence works for almost any plant purchase. The equipment itself does not appear until step three.

Payback, and when to go further

Simple payback is the initial cost divided by the annual savings. It answers one question, how quickly the money comes back. NIST Handbook 135, the federal life-cycle costing manual, warns that payback ignores every cost and saving after the payback point and "is not a measure of long-term economic performance or profitability." Use it as the headline number, then add a discounted measure for anything that will run for years.

Net savings (the same idea as net present value) is the present value of the base case costs minus the present value of the alternative's costs, using the company's discount rate. Internal rate of return is the discount rate at which net savings equals zero. Ask finance which discount rate or hurdle rate they use; do not pick one yourself.

Build the savings from three sources:

• Energy. For motor-driven and compressed air equipment, energy dominates the lifetime cost. DOE's compressed air tip sheet shows electricity at 76 percent of ten-year costs, against 12 percent for equipment and 12 percent for maintenance. DOE's motor tip sheet puts the purchase price of a 75-hp motor at about 2 percent of ten-year cost, with energy and maintenance making up the other 98 percent. Annual compressor energy cost can be estimated as bhp x 0.746 x operating hours x cost per kWh x percent time x percent full-load bhp, divided by motor efficiency. Use your own utility rate from the bill, and if the equipment in question is compressed air, the same arithmetic drives the piping decision.
• Labor. Hours saved per week times the loaded labor rate, plus any overtime the current equipment is generating.
• Downtime. Covered next; usually the largest number and the least tracked.

What an hour of unplanned downtime really costs

Most plants cannot put a defensible number on this. NIST's 2018 review of maintenance economics cites the observation that "many plants do not have reliable data on factors such as downtime and many more are unable to put an accurate cost on it," and a Swedish survey estimate that 83 percent of firms have no model to quantify downtime cost. NIST's own 2020 survey of U.S. discrete manufacturers found responses had larger error than federal survey data because it "asks about issues that, for many firms, are not formally tracked."

So you will have to estimate, and you should show your work. NIST's list of failure-related cost factors includes lost production, overtime to make up lost production, delivery delays, repair costs, defective parts, labor, and inventory. In practice, build the hourly figure from:

1. Lost throughput times contribution margin. If the line produces 1,200 units an hour at a contribution margin of X per unit, an hour down costs 1,200 X in margin, if the volume cannot be recovered later.
2. Idle direct labor during the stop, at loaded rates.
3. Overtime paid to recover the schedule, if the volume can be recovered.
4. Scrap and rework from the stop and restart.
5. Expedited freight on replacement parts and on late shipments to customers.
6. Customer penalties or lost orders, where contracts specify them.

Then multiply by the hours per year the current equipment actually costs you, from work order history or twelve months of shift logs. A conservative estimate you can defend beats a large one you cannot. Do not borrow an industry per-hour figure; most published ones are vendor-sponsored. If the gap is that nobody is tracking the hours, that is its own finding, and sensor-level diagnostics are one way plants close it.

Make the quotes comparable

Two quotes can differ by a lot and both be honest, because they cover different things. Ask every supplier for the same items:

• Scope of supply, in words, including what is excluded
• Part numbers with revision levels, and quantities
• Lead time, stated from receipt of order, and whether it is stock or build-to-order
• Freight terms. For international shipments, name the Incoterms 2020 rule and the named place. The ICC publishes eleven three-letter rules that clarify "the tasks, costs and risks involved in the delivery of goods from sellers to buyers." The current edition was released by ICC in September 2019 and renamed DAT to DPU. For domestic shipments, state who pays freight and where risk transfers.
• Validity period of the pricing
• Warranty term and what starts the clock (shipment, installation, or startup)
• Installation, commissioning, training, and startup support, included or priced separately
• Taxes and any tariffs or duties, included or excluded

Put the answers in one comparison table. The gaps are where the cost surprises live.

Plan lead time backward from the shutdown

Take the date the line must be running again and schedule backward: commissioning, installation, receiving and inspection, transit, the supplier's lead time, then your own purchase order approval cycle. Whatever date that lands on is the last day the order can be placed, and it is usually earlier than people expect. Add a buffer to the longest-lead items and order those first, even if the rest of the package is not final. A request that sits two weeks waiting for a signature consumes schedule the same way slow freight does.

Capital request or MRO expense

Most companies route the two differently, so classify the purchase first. The federal tax rules give a baseline. Section 263(a) of the Internal Revenue Code generally requires capitalizing the cost of acquiring, producing, or improving tangible property "regardless of the size or the cost incurred," and capitalized property is recovered through depreciation over time. IRS Publication 946 defines depreciation as "an annual income tax deduction that allows you to recover the cost or other basis of certain property over the time you use the property," and says property must be expected to last more than one year to be depreciable, while repair costs are generally deducted like any other business expense.

The main exception is the de minimis safe harbor in Treasury Regulation 1.263(a)-1(f). Under it, a taxpayer with an applicable financial statement (broadly, audited statements) may deduct amounts up to five thousand dollars per invoice or item; without one, the limit is two thousand five hundred dollars per invoice or item. The safe harbor requires an accounting procedure in place at the start of the year that expenses items below a set amount, and it is elected annually on the return.

Your company's internal capitalization threshold is a policy choice and may differ from the tax safe harbor, so ask accounting for the number and the form before you write the request. Note that a betterment, restoration, or adaptation of an existing unit of property is generally capitalized, so a rebuild that materially increases capacity may be a capital request even if it feels like maintenance.

This is general information, not tax advice. Your accounting team or tax advisor sets the policy that applies to your company.

The one-page version

Problem and its current cost. Scope and exclusions. Installed cost from comparable quotes. Savings by source, arithmetic shown. Payback, plus NPV or IRR at the company's rate. Schedule backward from the shutdown. Capital or expense, per policy. That is the case.