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Testing Adjusting Balancing (TAB) Commissioning Hong Kong
John Herbert
Director
Testing and Commissioning a new building is a multi-stage
process designed to ensure that the building operates as
intended before handover to client, therefore a complete
understanding those systems is a neccessity.
Experienced Testing and Commissioning (T&C) management
for new and existing buildings.
Testing, Adjusting and Balancing
Testing, Adjusting, and Balancing, also known as TAB,
are part of the whole process often called testing and
commissioning process. T&C does not start at the end of the project,
different systems have procedures, that need to be carried
progressively during the project, for example:
After electrical first fix, the installation is inspected continunity and insulation (mega) testing is carried out.
After electrical motor first fix, the motor is inspected and insulation test is carried out.
After hydraulic piping first fix, the installation is inspected and hydraulic pressure test carried out.
After gas first fix, the installation is inspected and hydraulic pressure test carried out.
After ductwork first fix the installation is inspected, and depending on the specification and pressure rating of the ductwork, pressure tests are carried out on the high pressure systems.
After refrigeration first fix, the installation is inspected, flushed and pressure test is carried out.
In all cases, irrespective of the contractor installing the systems,
the results of the inspection and recorded measurements are logged
and form part of the commissioning report delivered to the building
owner.
Similar to the first fix duties, after the second fix installation
is complete, the works are inpsected, tests are carried out, in
preparation for the adjusting and balancing processes.
It is worth noting that some specifications require equipment to
the tested by the manufacturer in the factory before the equipment
is approved for transportation, for example, HVAC chillers,
Air Aandling Units, refrigeration units, pressure vessels,
switchboards, etc. it also known as FAT (Factory Acceptance
Testing) and often witnessed by the building owner.
Adjusting and Balancing
After the basic testing is finished, and the basic components
have now been assembled into functional systems, then each system
is inspected to ensure all the necessary equipment is provided,
installed, and engergized.
Each system has different measures and methods for
adjustment and fine tuning, to ensure the completed
package conforms with the design intent.
But first closed circuit hydaulic systems, such as chilled water,
and air distribtion systems that require balancing must be
balanced first, before finally adjusting the prime mover.
Systems with equipment such as pumps that provide different
levels of performance shall be be measured, compared with
the design intent, and where necessary adjusted to match the
requirement.
Once the initial TAB is complete, functional tests are
carried out to ensure the overall performance of the system9s)
achieves the design intent.
For example, after the electrical, contorls, chiller plant,
chilled water pumps, and air handling units are operating and
adjusted, the temperature and humidity conditions in the space
are measured to demonstrate that the system(s) functions
correctly.
What's next, if you need Testing Adjusting Balancing
experts call us today!
