A project manager gets a call from the field. A skid-mounted pump assembly won’t connect. The flange spec on the connecting pipe changed three weeks ago — a routine engineering revision logged in Plant 3D — but procurement ordered to the previous drawing. The fabricated parts are wrong. Lead time on replacement: six weeks. Cost of the incorrect PO: north of $30,000.
Nobody made a mistake, exactly. The engineers updated the model. Procurement ordered what was in the system when they placed the order. The problem is the gap between those two moments — and nobody owned it.
This is not an unusual story. It is a pattern, and it is expensive.
The Gap No One Talks About
In most industrial projects, engineering and procurement are treated as sequential phases. Engineering designs the system. Procurement buys the components. Construction builds it. The handoff between phases is supposed to carry all the information each downstream team needs.
But engineering doesn’t stop when procurement starts. Changes keep coming — driven by client feedback, site conditions, safety reviews, code updates, or simply better information. And in most firms, there is no reliable mechanism to ensure that every procurement decision reflects the most current version of the design.
The result is a chronic misalignment between what engineers are designing and what procurement is buying. It rarely looks catastrophic in the moment. It looks like a slow accumulation of wrong orders, expedited deliveries, field rework, and change orders that no one can fully explain at project close.
Three Ways This Plays Out
The engineering-procurement gap shows up differently depending on where a project is in its lifecycle. Here are three documented patterns that illustrate how the same underlying problem surfaces in different forms.
1. One Pipe Change, Tens of Thousands in Rework
Process plant projects are uniquely vulnerable to design change cascades. Because equipment operations are interconnected — the output of one process step feeding directly into the next — a change anywhere in the system can ripple across multiple disciplines and procurement categories.
Construction claims experts at Long International have documented this pattern across process plant disputes. Their analysis shows that increasing a single pipe’s diameter by just one inch — after procurement is already underway — can trigger a cascade of follow-on purchases: new pipe, flanges, gaskets, and fittings; re-engineered pipe supports; recalculated stress values; resized control valves; and refabricated vessel connections. The cost impact of that single change can run to tens of thousands of dollars. And design changes totaling five to ten percent of the original contract value are not unusual on process plant projects.
The later in the project a change occurs, the more disruptive it becomes. A design revision that costs hours to implement in the model can cost weeks and significant dollars to correct in the field — especially when procurement has already acted on the previous version.
2. The Specification That Never Made It to the Contractor
The U.S. Department of Transportation’s Volpe National Transportation Systems Center published a comprehensive analysis of construction change orders in January 2025, drawing on data from infrastructure projects nationwide. One of its central findings: poor-quality or incomplete design specifications — errors and omissions in the plans, specifications, and estimates handed to contractors — are among the most consistent drivers of change orders across the industry.
Texas DOT’s experience puts a number on it. After implementing a formal tracking process for errors and omissions in engineering contracts, TxDOT found that approximately one-third of all change order value on its projects was traceable to errors and omissions in design documents. These weren’t cases of engineering negligence. They were cases where the specification that reached procurement and construction reflected an earlier design state — or contained gaps that nobody caught before the order went out. The construction team built to what was in the documents. The documents were wrong.
The Volpe report frames this as a quality-of-information problem: when the specifications handed off at the design-to-procurement boundary are incomplete or incorrect, change orders aren’t a risk — they’re a scheduled outcome. The fix begins before the wrong information gets locked into procurement documents.
3. Ordered Too Early, Delivered to the Wrong Spec
In EPC projects, procurement is not a one-time event. It is a continuous process that runs in parallel with engineering — and that parallel structure is precisely where the misalignment lives.
GEP’s EPC procurement research captures the exposure directly: procurement carries more than 50 percent of the cost weighting in a typical EPC project, with 90 percent of cash flow dependent on timely, accurate material delivery. When engineering changes are not reflected in procurement timelines, two bad outcomes compete: materials ordered too early sit in storage or arrive damaged; materials ordered too late halt construction. In both cases, the root cause is the same — procurement is acting on information that engineering has already moved past.
A 2025 study published in Engineering, Technology & Applied Science Research (ETASR), analyzing large-scale construction projects, found that design changes directly account for 56.5 percent of cost overruns and 40 percent of schedule delays. Most of those overruns are not caused by the design changes themselves — they are caused by the procurement and construction decisions that were made before the changes were communicated.
What the Numbers Actually Say
The individual incidents above are illustrative, but the aggregate picture is what makes this a strategic problem rather than an operational nuisance.
A single incorrect purchase order on a fabricated part can cost $30,000 or more once you account for the wrong material, expedited replacement, and construction delay. A fabricated component ordered to the wrong spec can introduce a six-week delay on a critical path item — and on most industrial schedules, six weeks on the critical path does not just push the completion date. It reshuffles labor, disrupts construction sequencing, and generates its own wave of change orders.
Meanwhile, every engineer on the project who is manually re-entering data between design tools and procurement systems is spending two to three hours a week on work that does not produce any design output. Across a team of ten engineers over a six-month project, that is roughly 650 hours of engineering capacity consumed by data movement.
None of these costs show up cleanly in a budget line. They are distributed across change orders, overtime, expediting fees, and rework. Which is part of why the problem persists: it never looks catastrophic on any given day. It just quietly inflates project cost and compresses margin.
What Closing the Gap Requires
The engineering-procurement gap is not a technology problem at its core. It is a data flow problem. Engineering produces data constantly. Procurement needs that data to be current at the moment a purchase decision is made. The gap exists because there is no reliable mechanism connecting those two moments.
Closing it requires three things working together. First, a single version of the truth — a design data source that everyone operates from, rather than copies of copies exported at different points in time. Second, a change propagation mechanism that is automatic, not manual — so that when an engineer updates a specification, that update does not depend on someone remembering to tell procurement. Third, visibility into the current state of the design across teams — so that procurement can confirm, before placing an order, that they are acting on the latest information.
Firms that get this right are not firms with better engineers or more disciplined procurement teams. They are firms that have removed the manual handoff from the equation.
The wrong PO, the bad fabrication order, the six-week delay — none of these are inevitable. They are the cost of a gap that most firms have simply learned to live with.
Sources
1. Long International — “Evaluation of Changes in Process Plant Projects”
2. U.S. DOT Volpe Center — “Understanding Construction Change Orders” (January 2025)
3. GEP — “EPC Procurement & Sourcing: Process, Risks, Challenges and Strategies”