What does a typical FAT/SAT and qualification process (DQ/IQ/OQ/PQ) look like for a pharmaceutical mixing plant?

Question

Accepted Answer

How amixon® supports FAT/SAT and the qualification (DQ/IQ/OQ/PQ) of pharmaceutical mixing plants

From the URS to a qualifiable plant

Production plants for powdered active substances stand or fall with the machines that transform the materials — mixers, agglomerators, vacuum dryers, synthesis reactors. Errors there cannot be compensated for. amixon® therefore designs every apparatus as a one-off on the basis of the URS (User Requirement Specification) and manufactures in-house in Paderborn — quality control remains complete throughout, and every specification can be evidenced down to component level (material certificates, surface finishes, welding documentation).

DQ, IQ, OQ — with amixon® support

amixon® supports the Design Qualification, Installation Qualification and Operational Qualification; documentation and execution follow, on request, EU GMP and FDA 21 CFR Part 11. Integration follows the operator's validation concept from the URS through to commissioning — including the requirements for electronic records and audit trails from 21 CFR Part 11, implemented in the project-specific automation (PLC programs, ERP integration, real-time barcode documentation).

FAT and SAT

The Factory Acceptance Test takes place at the Paderborn works — on the real apparatus, with the agreed test points from the URS. Assembly and the Site Acceptance Test are handled by experienced amixon® specialists in full cooperation with the operator and precise alignment with its processes; the documented results feed into the operator's IQ/OQ. The Performance Qualification with product is the operator's responsibility — on request, amixon® supplies the process parameters from pilot-plant trials with the original product as a well-founded starting basis.

The constructional foundation

GMP-compliant hygienic design is the precondition for any successful qualification: dead-space-free mixing chambers welded without joints, a top-mounted mixing tool only, Clever-Cut® accessibility, validatable CIP/WIP cleaning, FDA-compliant sterile designs (EHEDG, 3-A) — standards that amixon® meets and documents on request.

Secured in the amixon® pilot plant

The evidence comes before the investment: more than 30 test units in various sizes are available at the amixon® pilot plant at the Paderborn head office — supplemented by pilot plants in Japan, India, Thailand, China, South Korea and the United States. The trials run with the original product, with real fill levels and batch sizes, in the intended temperature and pressure range. Mixing quality, product protection, energy input, cleanability and reproducibility in later series operation are assessed; the results are evaluated and documented together with amixon® experts — as a reliable basis for decision-making that clears away technical and economic risks before the purchase.

Answer

Overview: aim and regulatory framework

Commissioning and qualification of a pharmaceutical mixing plant follows a structured, GMP-compliant procedure in accordance with, among others, EU GMP Annex 15, ICH Q7/Q9 and ASTM E2500.
The aim is documented evidence that the plant is suitable for its intended purpose and reproducibly delivers products of the specified quality.

Typical qualification steps:

DQ — Design Qualification

FAT — Factory Acceptance Test
SAT — Site Acceptance Test
IQ — Installation Qualification
OQ — Operational Qualification
PQ — Performance Qualification

Preparatory phase: requirements and specifications (URS/FDS/DS)

Before qualification begins, the fundamental specifications are defined:

User Requirement Specification (URS):
Description of the user requirements for the mixing plant (batch sizes, mixing times, speed ranges, temperature profiles, vacuum/overpressure, cleaning requirements such as CIP/SIP, freedom from dead space, drainability, ATEX zones, data integrity).

Functional Design Specification (FDS) and Design Specification (DS):
Detailing of the automation concept, the safety functions and the technical execution (P&ID, materials, surface roughness, control architecture).

These documents form the basis for the DQ and the later IQ/OQ/PQ tests.

Design Qualification (DQ)

The Design Qualification (DQ) is the first formal step in the qualification process.
It provides documented evidence that the planned plant design — based on the URS/requirements specification — meets all GMP and process requirements.

Typical content of the DQ for a mixing plant:

Reconciling the operator's requirements specification (URS) with the manufacturer's functional specification

Review of P&ID diagrams, isometric drawings, 3D models
Assessment of the product-contact materials (e.g. 1.4404/316L, surface roughness Ra ≤ 0.8 µm, electropolishing where applicable)
Evidence for seals and elastomers (e.g. FDA/USP Class VI)
Review of cleaning and sterilisation concepts (CIP/SIP, freedom from dead space, drainability)
Assessment of the automation (functional specification, recipe control, interlocks, alarm concept)
Incorporation of risk analyses (e.g. FMEA, HACCP) to define qualification-relevant functions

The outcome of the DQ is an approved design, for which the FAT/SAT and IQ/OQ/PQ are subsequently planned.

Factory Acceptance Test (FAT)

The FAT takes place at the plant manufacturer's premises and serves as advance acceptance before delivery.
The aim is to verify that the mixing plant has been built in accordance with the design and specification documents and that basic functions work correctly.

Typical FAT test content:

Static tests:
Visual inspection and dimensional check
Reconciling installed components with the parts list and specification
Weld seam documentation (borescopy where applicable)
Checking material certificates (e.g. EN 10204 3.1) and nameplates

Dynamic tests:
Idle operation of the agitator drives (rotational speed/torque measurement)
Leak-tightness testing (e.g. vacuum/pressure test, helium leak test for aseptic applications)
Functional testing of the mechanical seals
Testing of the heating/cooling functions without product

Control system/software:
I/O check, functional testing of the process steps
Testing of recipe control, alarm management and audit trail functionality (21 CFR Part 11)
Checking user administration and role permissions

Safety functions:
Testing of emergency stop, interlocks, protective covers
EMC behaviour, basic electrical safety

The FAT concludes with a signed FAT protocol and forms the basis for later use of FAT data in the IQ/OQ ("leveraging").

Site Acceptance Test (SAT)

The SAT takes place after delivery, bringing-in and connection of the plant at the final installation location in the pharmaceutical facility.
It serves as evidence that the plant has not been affected by transport and is correctly connected to the on-site utilities.

Typical SAT activities:

Checking for transport damage and correct installation

Verification of the utility connections (e.g. WFI, clean steam, process gases, compressed air, power supply)
Integration into building and process control technology (higher-level control and production systems, HVAC, cleanroom classification)
Repetition of critical FAT tests under real site conditions
Functional testing of the interfaces to upstream/downstream systems (e.g. dosing or filling lines)

A successfully completed SAT is frequently a precondition for formal IQ approval.

Installation Qualification (IQ)

The Installation Qualification (IQ) provides documented evidence that the mixing plant and its components have been installed to specification and correspond to the approved design.

Typical IQ test steps:

Reconciling as-built documentation with the design documents (P&ID walkdown)

Inventory and check of the delivered components against the order documentation and parts list
Checking the piping and fittings against the P&ID (flow direction, labelling, valve types)
Checking material certificates (e.g. 3.1 certificates) and weld seam documentation
Verification of calibration certificates for all GxP-relevant sensors (temperature, pressure, level, rotational speed, load cells)
Checking the supply media (quality and capacity of steam, water, compressed air, power supply)
Documentation of the software installation, versions, backup and recovery concepts
Setting up maintenance, calibration and spare-parts schedules

The IQ creates the basis on which functional capability in process operation (OQ) is tested in the next step.

Operational Qualification (OQ)

The Operational Qualification (OQ) checks whether the mixing plant functions reliably and reproducibly within the specified operating ranges.
These tests are usually carried out without active ingredients, for example with water or placebo media.

Typical OQ test content:

Testing the operating limits (worst case):
min./max. fill volume
min./max. speed ranges
temperature and pressure limits (vacuum/overpressure)

Process-related functional tests:
Mixing-time studies and homogeneity tests (e.g. tracer trials)
Checking heating/cooling rates and temperature stability
Validation of the CIP/SIP cycles (e.g. wetting test with riboflavin, residue measurements, F0 value for sterile processes)

Safety and interlock tests:
Function of emergency stop, door/lid interlocks, overfill and dry-run protection
Testing of alarm messages, limit-value exceedances and response times

Software and data integrity tests:
Checking recipe management, batch reports and audit trail
Testing power-failure and restart scenarios
Verification of user and rights management in accordance with data integrity requirements (ALCOA+)

A successfully completed OQ confirms that the plant masters the specified functional scope and is a precondition for the PQ.

Performance Qualification (PQ)

The Performance Qualification (PQ) is the final piece of evidence that the mixing plant consistently delivers the required quality under real production conditions with the original product or representative placebos.

Typical PQ elements:

Manufacture of at least several consecutive batches (consistency approach)

Sampling at representative extraction points to confirm mixing quality (e.g. homogeneity, relative standard deviation RSD frequently ≤ 5 %)
Analytical testing in accordance with the product specification (active-ingredient content, particle size distribution, viscosity, density)
Assessment of temperature stability, reaction control (for exothermic processes) and reproducibility across multiple batches
Application of statistical methods (e.g. Statistical Process Control, SPC) to assess process capability

A successfully completed PQ is the precondition for process validation and commercial production release of the mixing plant.

Interplay of FAT/SAT and IQ/OQ (leveraging, GEP)

Under modern approaches (e.g. ASTM E2500, "Good Engineering Practice"), a leveraging concept is frequently applied:

FAT results are deliberately carried over into the IQ/OQ where the test scope and conditions are comparable.
This reduces duplicate testing, shortens the time to commissioning and lowers project costs without compromising regulatory compliance.
The precondition is clean documentation in the FAT and a clear mapping of the tests to URS/DQ requirements.

Completion and maintaining the qualified state

After successful DQ/FAT/SAT/IQ/OQ/PQ:

the plant is released for routine operation (generally by the Qualified Person, QP),
the qualified state is permanently maintained through change control, calibration programmes, maintenance, requalification and Continued Process Verification (CPV).

The FAT/SAT and qualification process (DQ/IQ/OQ/PQ) thereby forms the GMP-compliant basis for robust, reproducible and regulatorily secure operation of a pharmaceutical mixing plant.