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Commissioning works can begin at the stage of connecting the power supply, immediately checking that the equipment’s operating modes match its datasheet. Testing is carried out, the unit’s operating parameters are determined across different modes, adjustment and tuning are performed, and various assemblies are tested. If parameters deviate from the nominal values, repair, preventive maintenance and adjustment of individual units or of the whole unit may be required.
Commissioning works require deeper knowledge than installation. At this stage, specialists with relevant higher or technical education and the necessary experience are involved. The tools used to commission the equipment are more sophisticated, and specific instruments may be required.
Commissioning works may be carried out by the customer or by an organisation hired by them that specialises in such services. Commissioning is not part of installation works. It differs in the technologies, tooling and materials used. Without commissioning, you cannot be sure that the equipment has been assembled correctly and is operational. Thorough and properly performed commissioning works guarantee the normal operation of the units.
- Checking and eliminating installation errors;
- First start-up (trial run);
- Intermediate testing;
- Setup and adjustment;
- Equipment testing, including measurement of the main technical parameters;
- Integrated testing of several systems;
The following types of work are carried out at the initial stage:
- A commissioning programme is drawn up, including occupational safety and health measures for the works;
- Equipment installation defects are identified;
- Instrumentation and test equipment are prepared;
- Relay protection settings, automatic control systems (ACS) and interlocks are agreed;
- Voltage is supplied to the working points;
- Plant orders are issued and an acceptance commission for the start-up and commissioning works is appointed.
The climate-control, ventilation and lighting systems must be connected. Electrical equipment must be installed and earthed according to all the rules. Adjustments are also made in line with the design, additional equipment is supplied, and the necessary instruments undergo metrological verification.
At the next stage of start-up and commissioning, individual tests of the electrical systems are carried out (checks and tests of cooling systems and regulating transformer devices under load, as well as protection systems and ACS).
At the final stage of start-up and commissioning, a software-controlled start-up of the electrical equipment is performed. At this stage the interaction of all systems is checked in start-up mode under load.
Commissioning works are carried out in accordance with the following regulatory documents:
SNiP 3.05.05-84 Process equipment and process pipelines
SNiP 3.05.06-85 Electrical devices
SNiP 3.05.07-85 Automation systems
SNiP 3.05.01-85 Internal sanitary engineering systems