What Is During Production Inspection (DUPRO)? Steps, Benefits and Differences from PSI

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In international trade and industrial procurement, ensuring product quality before delivery is a major concern for buyers and importers. Technical and quality nonconformities may arise at different production stages; identifying them only after manufacturing is complete or at delivery can make corrections more difficult and expensive.

During Production Inspection (DUPRO) is a quality assessment approach that enables products and relevant manufacturing activities to be checked before the entire order is completed.

This article explains DUPRO, its stages, benefits, differences from Pre-Shipment Inspection (PSI), and applications across industries.

What Is During Production Inspection (DUPRO)?

DUPRO is an inspection carried out at an intermediate stage of order production, examining products and related manufacturing activities.

Its principal objective is to identify potential nonconformities in technical specifications, workmanship, raw materials, dimensions, performance, or other agreed criteria before production is complete.

Within the agreed scope, an inspector may examine completed items, work in progress, quality control procedures, and associated records.

For example, an importer of industrial equipment may ask an independent inspection company to check component quality and contractual conformity after part of the order has been manufactured.

Such a check can support early detection of problems and informed decisions on continued production or corrective actions.

At What Stage Is DUPRO Performed?

Timing depends on the product, manufacturing duration, contract terms, and inspection objectives.

In some commercial practices, DUPRO is scheduled when approximately 20% to 80% of an order has been completed. This range is not a universal requirement or a fixed standard for all industries.

For complex industrial equipment, specific inspection points may be defined in an Inspection and Test Plan (ITP).

These points may cover fabrication, assembly, technical testing, or checks before packing.

Important: The inspection should be scheduled when products can be meaningfully examined while enough time remains to address potential nonconformities.

Main Objectives of DUPRO

Early Identification of Nonconformities

A central purpose of DUPRO is to identify possible problems before the entire order is completed.

Examples include incorrect dimensions, substitution of materials, assembly defects, poor workmanship, or deviations from contractual specifications.

Reviewing the Manufacturer’s Quality Controls

Within the assignment scope, inspectors may review quality control records, test methods, and how results are documented.

This is not a full quality management system audit unless such an audit is expressly included in the contracted scope.

Reducing Recurrence of Defects

When a nonconformity is found early, the manufacturer may investigate its cause and prevent recurrence in other items.

Supporting the Delivery Schedule

Finding problems during production can help buyers and manufacturers make informed decisions about corrective-action schedules and delivery.

Inspection alone does not guarantee on-time delivery.

Stages of During Production Inspection

Step 1: Request and Scope Definition

The buyer or client provides order details, product type, technical specifications, manufacturing location, schedule, and inspection objectives.

Acceptance criteria and reference documents are established at this stage.

Step 2: Technical Document Review

The inspector may review purchase orders, technical drawings, material specifications, test procedures, and the ITP.

The aim is to establish the criteria against which findings will be evaluated.

Step 3: Visit to the Manufacturing Site

The inspector attends the factory or fabrication site at the agreed time.

Production status, order progress, and access to the relevant items are assessed.

Step 4: Inspection of Products and Related Processes

Depending on the goods, inspection activities may include:

Checking dimensions and visual characteristics of components
Verifying quantities already manufactured
Checking specifications of raw materials and components
Observing fabrication and assembly
Reviewing technical test results
Checking product identification and marking
Examining packaging where applicable
Sampling according to an agreed plan

Step 5: Recording Nonconformities

When nonconformities are observed, their details are documented in the inspection report.

Records may include the deviation description, item identification, relevant criterion, and supporting evidence.

Step 6: Issuing the Inspection Report

Once the assignment is completed, an inspection report is prepared and findings are communicated to the client.

Decisions on acceptance, corrective action, or production schedule changes are generally made under the contract and defined authorities.

DUPRO vs. Pre-Shipment Inspection (PSI)

Both methods assess product quality and conformity, but they differ in timing and operational purpose.

During Production Inspection (DUPRO)

This inspection takes place during manufacturing, focusing on product status and detecting deviations before the order is complete.

Pre-Shipment Inspection (PSI)

PSI is typically performed after manufacturing is completed and before the shipment is dispatched.

At this stage, agreed checks may address quantity, quality, visual condition, packaging, marking, and other requirements.

Key Differences

Timing: DUPRO takes place during manufacturing; PSI takes place before shipment.

Purpose: DUPRO focuses on detecting problems during intermediate stages, whereas PSI focuses on product condition close to dispatch.

Opportunity for Correction: DUPRO generally leaves more time to address certain deviations.

Scope: Both are governed by contracts and technical requirements; neither automatically covers every product characteristic.

Using both approaches within one project can complement inspection coverage at different procurement stages.

Applications of DUPRO Across Industries

Metals and Industrial Equipment

During industrial equipment fabrication, DUPRO can cover dimensions, material specifications, welding status, assembly, and related test results.

Oil, Gas, and Petrochemicals

For oil, gas, and petrochemical projects, in-process inspection of equipment may include reviewing material documentation, fabrication stages, non-destructive tests, pressure tests, or other ITP-defined checks.

Actual activities depend on the equipment type and agreed inspection scope.

Consumer Goods

In consumer-goods production, DUPRO may cover workmanship, appearance, performance, quantities, and packaging status.

Electrical and Mechanical Equipment

Inspections may involve components, assembly, technical characteristics, functional test results, and quality control documentation.

What Is the Role of the Inspection and Test Plan (ITP)?

An Inspection and Test Plan identifies key quality control stages, inspection activities, testing methods, and the responsibilities of relevant parties.

In industrial projects, it may define points for document review, witnessing activities, accepting test results, or inspector attendance.

Two commonly used terms are:

Hold Point: A point beyond which work may proceed only after the required authorization or approval from the designated party, as defined in agreed requirements.

Witness Point: A point for which the relevant party is notified of an activity or test so it may observe it; what happens if the party does not attend depends on the ITP and contract.

Clear definitions help prevent ambiguity about inspection responsibilities and scheduling.

Can DUPRO Detect Every Defect?

No. A limited or sample-based inspection cannot guarantee detection of every possible defect.

Results depend on inspection timing, scope, sampling method, access to items, and quality of evidence.

Some nonconformities may also arise after inspection during subsequent manufacturing or transport stages.

For critical projects, a combination of incoming-material inspection, DUPRO, specialist testing, and PSI may therefore be appropriate.

How Is the Cost of DUPRO Determined?

Cost depends on several factors, including:

Product type and technical complexity
Factory location and accessibility
Duration of inspector attendance
Number of inspection stages or points
Order volume and number of items
Specialized equipment or testing requirements
Required reports and documentation

To obtain a cost estimate, clients should provide order details and the requested service scope.

IGI Industrial Inspection Services

International Commercial Goods Inspection Company (IGI) provides specialized goods inspection, quantity and quality verification, and technical specification assessment across industrial and commercial sectors.

Where manufacturing-stage checks are required, the inspection scope is determined according to the equipment, technical requirements, and contractual conditions.

Related services include consumer and industrial goods inspection, oil and gas equipment inspection, factory assessment, and laboratory services.

Learn more about IGI services:

Frequently Asked Questions About DUPRO

Is DUPRO necessary for every import order?

No. Its necessity depends on the goods, risk level, contract terms, and buyer requirements.

Is DUPRO the same as factory quality control?

No. Factory quality control is usually an internal manufacturer activity, while DUPRO may be conducted by an independent inspection body within a defined scope.

Is an inspection certificate issued after DUPRO?

Depending on the scope and findings, an inspection report or relevant certificate may be issued.

Does DUPRO replace PSI?

Not necessarily. They occur at different stages and can complement each other.

Can an inspector order production to stop?

The inspector’s authority depends on the contract, ITP, and applicable requirements. Conducting an inspection does not automatically confer the authority to stop production.

Conclusion

During Production Inspection (DUPRO) is an important approach to assessing products and identifying potential nonconformities during intermediate manufacturing stages.

It can help buyers and importers obtain documented information on production status and conformity with agreed specifications before an order is completed.

For industrial projects and international transactions, an appropriate combination of DUPRO, PSI, and technical testing can reduce the risk of receiving nonconforming goods.

Appropriate scheduling, clearly defined scope, and competent inspectors are essential to effective inspection.