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17th March 2025

Site Acceptance Testing (SAT) vs. Factory Acceptance Testing (FAT)

In This Article

Introduction

SAT and FAT are essential steps in the equipment validation process. They ensure machinery meets both contractual and regulatory requirements. FAT is typically conducted before shipping. Here, equipment undergoes pre-shipment testing to verify functionality against design specifications. SAT, on the other hand, is performed post-installation. It validates machinery’s on-site readiness and confirms that it integrates.

Both FAT and SAT play a vital role in quality assurance testing. They help to reduce risks and ensure equipment performance. Proper execution of acceptance testing ensures compliance with project requirements and standards.

Motion Drives and Controls offers tailored FAT and SAT solutions across various industries. These focus on cost-effective and efficient equipment commissioning. Our team ensures that each test phase is conducted in alignment with best practices. This is from pre-deployment testing to post-installation validation. These ensure that machinery is tested to ensure peak performance.

What is Factory Acceptance Testing (FAT)?

Definition and Purpose

Factory Acceptance Testing (FAT) is a critical pre-shipment testing process. It is normally conducted at the manufacturer's facility. Its purpose is to ensure that equipment operates according to the specifications. During FAT, the equipment undergoes a series of tests. These verify its functionality, performance, and compliance with contractual and regulatory requirements. This process allows for early identification of any issues. From this, businesses can ensure that equipment meets the expected standards before shipping.

FAT is an essential step in the equipment procurement process. It provides confidence to both manufacturers and clients that the machinery is ready. By performing FAT, manufacturers can address any potential problems in a controlled environment. This reduces the likelihood of costly delays or issues once the equipment is on-site. Ultimately, FAT helps to ensure that the equipment will perform correctly upon delivery.

Key Components of FAT

FAT involves several key components to ensure the equipment meets specifications and standards.

  1. Performance Validation. This step verifies the operational efficiency of the equipment. It checks whether the machinery functions as expected under various conditions. This ensures that it meets the required performance criteria.
  2. Functional Testing. Each component of the equipment is tested to ensure it operates as intended. This includes verifying that all systems are properly integrated and work together smoothly.
  3. Compliance Checks. FAT ensures that the equipment complies with relevant safety and regulatory standards. These checks confirm that the machinery adheres to industry-specific requirements. This reduces the risk of legal or operational issues.
  4. Documentation. Detailed records of test results are maintained for traceability. This documentation provides a clear record of the testing process. It serves as a reference for inspections or audits, ensuring accountability and transparency.

Industries Benefiting from FAT

Various industries benefit from FAT, including:

  • Oil and Gas. Pumps and compressors are tested under simulated conditions for reliable performance.
  • Pharmaceuticals. Equipment is validated for precision and compliance with strict regulatory standards.
  • Manufacturing. Machinery is tested to ensure operational efficiency and safety before installation.

What is Site Acceptance Testing (SAT)?

Definition and Purpose

Site Acceptance Testing (SAT) is performed after equipment installation at the customer's site. Its purpose is to ensure that the equipment integrates into its operational environment. This also ensures that it functions as expected under real-world conditions. A testing phase also validates the equipment’s performance. It checks that it meets the specifications and operates within the installed system. SAT also helps identify any issues that may arise during installation or initial use. This allows for prompt resolution. Ultimately, SAT ensures that the machinery is operational and ready for regular use. This ensures a smooth transition to full production.

Key Components of SAT

SAT includes several key components to ensure the equipment performs in its environment.

  1. System Integration Testing. This step ensures that the equipment is compatible with existing systems and processes. It verifies that components work together, without any issues that could affect performance.
  2. Environmental Validation. SAT confirms that the equipment performs effectively under real-world conditions. It takes into account factors such as temperature, humidity, and other environmental variables. These could impact the operation, ensuring it works as intended in its location.
  3. Final Compliance Testing. This component ensures that the equipment meets all site-specific safety and regulatory standards. It includes checking for compliance with local laws, safety protocols, and industry-specific regulations. This ensures the equipment is safe to operate and legally compliant.

Together, these components help ensure the equipment is ready for full operational use.

Industries Benefiting from SAT

Several industries benefit from Site Acceptance Testing (SAT), including:

  • Energy. SAT is used to verify the performance of turbines and other equipment at power plants. This ensures they function effectively in the operational environment.
  • Transportation. In warehouses, SAT is used to test conveyor systems and other machinery. This ensures they are ready for continuous operation.
  • Manufacturing. SAT confirms that newly installed equipment integrates into existing systems and operates efficiently.
  • Healthcare. Medical equipment is validated during SAT. This ensures it meets regulatory and operational requirements before being put into use.

These industries rely on SAT to ensure equipment performs reliably and safely.

FAT vs. SAT: Key Differences

Testing Location and Environment

FAT is conducted in a controlled environment at the manufacturer’s facility. This allows for precise testing under ideal conditions. Because of this, you can ensure the equipment meets design specifications before shipment. The manufacturer can carefully monitor all aspects of performance, functionality, and safety.

Site Acceptance Testing (SAT), however, takes place on-site at the customer’s location. It accounts for real-world operational conditions, such as environmental factors and system integration. SAT ensures the equipment operates effectively within its actual environment. It verifies compatibility with existing systems and confirms its readiness for everyday use.

Objectives and Focus

The main objective of FAT is to ensure that each piece of equipment functions correctly. It also ensures that it meets design specifications before shipment. FAT focuses on verifying individual components and checking for compliance with standards. This helps to confirm that equipment operates as intended in a controlled setting.

In contrast, SAT aims to confirm how well the equipment integrates with existing systems. SAT confirms that the equipment is operational, ready for use, and capable of functioning efficiently.

Stakeholders Involved

In FAT, the primary stakeholders include manufacturers, quality assurance teams, and procurement specialists. Manufacturers conduct the testing to ensure equipment meets design specifications. Quality assurance teams verify compliance with safety and regulatory standards. Procurement specialists also ensure that the equipment meets the buyer’s requirements.

For SAT, stakeholders include system integrators, operations managers, and on-site maintenance teams. System integrators are responsible for ensuring the equipment works seamlessly with existing systems. Operations managers oversee the validation of equipment performance. Maintenance teams ensure that the machinery is installed and ready for support.

Documentation and Handover

In FAT, the process results in detailed testing protocols and performance reports. These documents outline the specific tests conducted, the results, and any actions taken. This documentation serves as a record of compliance. It also verifies that the equipment meets the required standards before shipment.

In SAT, the process concludes with an operational readiness certificate and final acceptance. The certificate confirms that the equipment is fully functional and ready for operation. It also serves as formal approval from the customer. This signals the completion of the installation and the start of regular operations.

Benefits of Conducting Both FAT and SAT

Minimising Risks

FAT helps reduce risks by identifying and resolving issues early in the process. Conducting FAT before equipment is shipped is vital for manufacturers. They can detect and address any performance or compliance issues before shipping. This prevents costly corrections or delays during SAT, which is performed on-site. Resolving issues early during FAT ensures the equipment functions as expected upon installation. This reduces the risk of operational disruptions and the need for on-site troubleshooting. A proactive approach helps save time, resources, and costs for manufacturers and clients.

Ensuring Seamless Integration

SAT is crucial in ensuring seamless integration of new equipment into existing systems. During SAT, the equipment is tested in its real operational environment. From this, you can validate compatibility with other systems and processes. This step ensures that all components work together smoothly, preventing any potential disruptions. Addressing issues during SAT ensures the equipment can be optimised for maximum efficiency. This improves performance but also reduces the risk of future complications. From this, it ensures that equipment functions as part of a well-coordinated system.

Enhancing Stakeholder Confidence

Both FAT and SAT help improve stakeholder confidence. It does this by encouraging trust between manufacturers and buyers. Transparent testing ensures both parties understand the equipment's performance and compliance. FAT ensures that the equipment meets the agreed standards before shipping. SAT confirms its readiness for operation in the real environment. Documenting and sharing results provides buyers with assurance that equipment will function properly. This reduces uncertainties and builds trust. Being transparent in the testing process also strengthens relationships and ensures mutual satisfaction.

Challenges and Best Practices in FAT and SAT

Common Challenges 

FAT faces the challenge of limited ability to simulate real-world conditions. Testing confirms that equipment meets design specifications. However, it won't account for environmental factors or operational challenges during actual use.

On the other hand, SAT may face delays due to unanticipated site-specific issues. This includes integration problems with existing systems or environmental factors. This can cause unforeseen disruptions, making it more difficult to resolve issues quickly. Both phases need careful planning to reduce such risks and ensure smooth operations.

Best Practices

For FAT, it’s essential to define clear testing protocols and objectives upfront. This ensures that all parties understand the scope, the criteria, and the outcome. Establishing clear guidelines also helps avoid confusion. It ensures that the tests are comprehensive and aligned with project requirements. Engaging key stakeholders early in the process is also important. These include quality assurance teams, procurement specialists and the customer. Being collaborative allows for better alignment of expectations. It also ensures that any concerns or specifications are addressed before testing begins.

For SAT, conducting a thorough pre-installation site assessment is a critical best practice. Addressing the infrastructure, environmental conditions and existing systems beforehand is crucial. This helps identify challenges and make adjustments for smooth integration. A pre-installation assessment helps reduce surprises during SAT. It also ensures the equipment will perform as expected on-site.

Additionally, developing a SAT checklist can streamline the testing process. A well-organised checklist ensures that all aspects of performance and integration are covered. Having a checklist helps prevent missed steps. This ensures efficient testing and meets all criteria before final acceptance.

How Motion Drives and Controls Supports FAT and SAT

Expertise Across Industries

Motion offers extensive expertise in managing FAT and SAT for complex systems. This includes the manufacturing, pharmaceuticals, and aerospace industries. Our team is skilled at handling the unique challenges each sector presents. This ensures that equipment meets both technical specifications and regulatory standards. In manufacturing, we ensure system integration and operational efficiency. In pharmaceuticals, we validate precision and compliance with strict industry regulations. For aerospace, we focus on performance and safety. This ensures that equipment functions reliably under demanding conditions. Our experience enables smooth, efficient testing processes in all sectors.

Customised Testing Protocols

Motion Drives and Controls adopts a tailored approach to testing. We create customised protocols that ensure equipment meets industry standards and site-specific requirements. Our team works closely with clients to understand the unique needs of each project. This could be for manufacturing, pharmaceuticals, or aerospace. We design testing procedures specific to the operational environment and regulatory demands. This ensures compliance and optimal performance. Our customised approach guarantees that equipment functions as required. It also reduces risks, improves efficiency and provides stakeholders with confidence.

On-Site Support and Training

Motion Drives and Controls offers comprehensive on-site support and training during SAT. This ensures smooth integration and operation. Our team provides expertise for issues that may arise during installation and testing. This ensures that equipment functions as expected. Additionally, they offer training sessions for on-site staff. This gives them the knowledge to operate and maintain the equipment effectively. Our hands-on support helps reduce disruptions and empowers teams to handle future challenges. It also ensures that the equipment performs optimally in its real-world environment. Our commitment to support ensures long-term success and efficiency.

Conclusion

FAT and SAT ensure that equipment meets specifications, compliance standards, and operational requirements. FAT verifies that the equipment functions correctly before shipment. SAT ensures that it integrates seamlessly into the operational environment and performs efficiently. These testing stages help identify and resolve issues early. This reduces risks and ensures smooth equipment operation.

Motion Drives and Controls plays a role in delivering comprehensive, tailored FAT and SAT solutions. These include industries like manufacturing, pharmaceuticals, and aerospace. We specialise in creating customised testing protocols. We also provide on-site support and ensure regulatory compliance. This helps guarantee reliable equipment performance and meets all required standards.

Stakeholders should prioritise FAT and SAT to avoid costly delays and complications. Investing in these critical testing stages is key for businesses. From this, you can ensure success, improve confidence and optimise efficiency. Motion offers the expertise and support needed to ensure that each project is successfully completed. We also ensure that equipment is ready for smooth and efficient operation from day one.

FAQs

What is the primary difference between FAT and SAT?

The primary difference between FAT and SAT is their timing and purpose. FAT is performed at the manufacturer's facility before equipment is shipped. This ensures it meets design specifications and functions as intended. SAT is conducted after installation at the customer’s site. This focuses on verifying equipment integration and performance under real-world conditions.

Are FAT and SAT mandatory for all industries?

While FAT and SAT are not mandatory for all industries, they are highly recommended. This is particularly in sectors like manufacturing, pharmaceuticals, energy, and aerospace. In these industries, equipment performance, safety, and regulatory compliance are critical. These tests ensure the machinery meets industry standards and operates efficiently.

How long does each testing phase typically take?

The duration of FAT and SAT can vary depending on the complexity of the equipment. FAT generally takes a few days to a week, depending on the scope of testing. SAT can range from a few days to several weeks. This is especially if on-site conditions require detailed testing and troubleshooting.

Who is responsible for conducting FAT and SAT?

Manufacturers or system integrators typically conduct FAT. SAT is managed by the manufacturer, integrators, and the client's operations teams.

Can FAT and SAT be combined for smaller projects?

Yes, for smaller projects, FAT and SAT can sometimes be combined. It also depends on the equipment and project requirements. However, it’s essential to ensure all testing criteria are met, even when combined.

Test with Confidence, Perform with Certainty

Understanding the difference between Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) is vital for seamless commissioning. At Motion Drives and Controls, we go beyond the theory — delivering bespoke FAT and SAT services that ensure your machinery is validated, compliant, and ready to perform from day one. Explore how we help reduce risk, enhance reliability, and support your operational goals with hands-on testing expertise and industry-leading support.