The commissioning (Cx) process ensures that mechanical, electrical, and plumbing (MEP) systems function as designed, giving owners confidence in their final installation. Building commissioning follows standardized processes to uphold quality, while complex or unique systems require additional attention.
To facilitate smooth building turnover, the MEP commissioning process includes multiple parts. Checklists and reports are used to perform testing and validate operations.
- Pre-functional checklists: Verify installation
- System readiness checklists: Confirm required testing
- Functional performance tests (FPTs): Validate system operation
- Test, adjust, and balance (TAB) reports: Confirm design conditions are met
- Operations and maintenance (O&M) manuals and training: Support long-term system use
Additionally, a final commissioning report compiles all findings for future reference. To support long-term system reliability, these commissioning in construction steps are essential.
"Commissioning is a planned and organized approach to placing systems into service by qualified personnel...During construction, we move from a static phase to the dynamic state where equipment is started, checks and tests are performed, and performance is verified," Josh Natale, Commissioning Manager, said. "Afterwards, the project transitions into a completed state with ongoing warranty commitments and often long-term monitoring and verification."
Case Study: Optimizing HVAC System Performance
A client's new facility was struggling to meet cooling demands, prompting a commissioning effort to optimize system performance and energy efficiency. Our team identified design modifications, including adding an air-cooled chiller, installing a variable frequency drive on the chilled water pump, and adjusting the sequence of operations. A detailed controls review uncovered discrepancies in system programming, which we addressed before they could impact operations.
During functional performance tests (FPTs), control programming errors and deficiencies were identified in the original test, adjust, and balance (TAB) report. To support proper system performance, we recommended a full system rebalance and engaged a National Environmental Balancing Bureau (NEBB)-certified test and balance firm. Following commissioning, the facility successfully maintained the required cooling load while achieving significant energy savings.
Case Study: Commissioning over 1,600 FPTs
Commissioning a massive, high-performance facility under a demanding timeline required a proactive and solutions-driven approach. With over 1,600 functional performance tests and 8 integrated system tests (ISTs) to complete, our team worked closely with our trade partners to maintain the project schedule. Early engagement led to meticulously tracked test readiness, addressed issues before they escalated, and managed power delivery for equipment, streamlining coordination with the electrical subcontractor.
As the project moved into IST, our focus on real-world performance validation ensured smooth execution. Government representatives observed the tests, which proceeded without issue, making it one of the most efficient IST executions on campus. Optimizing load bank and cable rentals led to significant cost savings and helped the facility meet its performance requirements, demonstrating the value of a well-executed commissioning process.
"When the various MEP systems are commissioned, we provide our clients with a proven system that they can have faith in," Preston Sartain, Commissioning Manager, said.
A proactive MEP commissioning process helps detect and address issues early in projects, preventing operational disruptions. By following best practices in building commissioning, teams can improve system reliability, efficiency, and long-term cost savings.
This article is part of a blog series. Click here to read part one.
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