SITE PRE-COMMISSIONING AND COMMISSIONING PROCEDURE
Pre-commissioning and Commissioning Procedure
The Service-provider shall be responsible for the safe and efficient setting to work of the whole the plant and equipment. The methods adopted shall be to the approval of the Engineer or his representative on Site, and shall be in accordance with any safety and permit regulations in forced by the Employer on the Site.
Key Test Equipment and Tools Required at Site:Up to 10 kV multiple range megger tester;
Digital earth tester;
DC 10 kV sheath tester;
DC high voltage test set;
Pole Rescue Kit;
Switchboard Rescue kit;
Confined Space Monitoring and Rescue equipment;
Roadway warning signs;
Work site communication equipment (e.g. 2-way radio);
An insulated operating stick and tool head;
Insulating Gloves applicable to the task;
Dry chemical fire extinguisher, etc.
Documentation Required for Pre-commissioning and CommissioningHV cable pre-commissioning and commissioning Inspection form;
DC 10 kV sheath insulation test report;
High voltage test report;
Copper core megger test report;
Capacitance test report;
Earth electrode resistance test report for joint bay;
All test report for each joint bay.
Schedule for Pre-commissioning Test
At least two months before commencing the commissioning of any plant or equipment, the Service-provider shall submit for approval fully comprehensive schedules of pre-commissioning checks as applicable to each item of the plant and equipment provided. These schedules shall then be used during pre-commissioning as a guide to the methods to be followed and to record the actual activities carried out with the appropriate date, together with details of all work yet to be completed, variations and modifications to design conditions.
In addition the Service-provider is to submit with the schedules to the Engineer’s representative proforma test sheets (to be used by the Service-provider during testing and commissioning) for all tests he proposes to carry out and those required by the Engineer’s Representative.
Each activity on the schedules, when completed to the satisfaction of the Engineer’s Representative, shall be signed and dated by the Service-provider. The schedules shall be countersigned by the Engineer’s Representative as necessary. If during the performance of the pre-commissioning checks the Engineers representative considers that additional tests are necessary to prove the system or plant the Service-provider shall perform such additional tests to the Engineer’s satisfaction.
Schedule for Commissioning and It’s Procedure
The Service-provider shall also submit for approval schedules of commissioning procedures that proposes to follow when bringing into service groups of plant items during the commissioning period. These schedules shall detail the tests necessary to ensure the complete and satisfactory commissioning of each section of plant and shall detail all operational limitations. The schedules shall be used during commissioning which shall only commence when the relevant pre-commissioning check schedules have been completed.
Each activity on the commissioning procedure schedules when completed to the satisfaction of the Engineer’s Representative, shall be signed and dated by the Service-provider and shall be countersigned by the Engineer’s Representative as necessary.
The commissioning procedures shall ensure that the commissioning of any section of the Works does not interrupt the normal commercial operation of any previously commissioned section(s) and/or existing facilities.
21 days prior to commencing commissioning checks the Service-provider is to agree with the Engineer’s representative the method and sequence of performing the commissioning tests. Following agreement the Service-provider shall submit a detailed program indicating the testing sequence to permit advance notice to be given to the Employer in order that the Employer’s representatives may also become as witness testing if so desired.
When the commissioning of each section of the work is complete the Service-provider shall carry out such preliminary tests as are necessary to establish that the plant is functioning correctly and efficiently, and shall make any adjustments required.
The Service-provider is to supply all test equipment, tools chemicals, lubricating oils and greases and other materials required for the aforementioned operations.
Site Supervisory Staff for Commissioning Test
During the commissioning and subsequent testing of any item of plant the Service-provider is to provide for the services of any special supervisory staff necessary for the purpose of ensuring proper commissioning and the satisfactory completion of all tests. The kind of such services is deemed to be part of the tendered for Erection of Plant.
Skilled Manpower required as:Electrical Fitter or Cable joiner;
Safety supervisor or observer required.
Commissioning of Modified Circuits of Line
Where the scope of works has included the diversion, relocation or variation of any existing circuit the Service-provider is deemed to have included for all pre-commissioning checks on existing equipment. Where this work includes overhead line or cable circuits the Service-provider is responsible for carrying out full pre-commissioning and on-load checks at the remote end of the circuit including the injection testing and re-setting of relays or other controlling devices if required.
All and any such work associated with the re-commissioning of existing equipment is deemed to be included in the contract.
Test Equipment for Carry Out the Pre-commissioning and Commissioning Test
The Service-provider is responsible for providing all equipment, tools and power supply, etc. necessary to carry out all tests on site. Following award of contract the successful Service-provider shall submit a detailed schedule of the test equipment that should be used intends to provide for carry out this portion of the work. If the Engineer require additional or alternative test equipment to be provided to enable full site testing to be performed in accordance with the requirements of the specification that Service-provider shall supply such equipment as a part of the contract.
It’s necessary to follow the local and international safety rules to carry out the pre-commissioning and commissioning test at site. Need to ensure the safety notice to working force and public in the working zone.
Ensure appropriate construction and operational drawings are on hand during carry out the pre-commissioning and commissioning test;
Before testing confirm physical check first that cable are well dedicated in position, then apply correct methods to positively identify the cable to be tested, including ensuring that circuit and cable numbers are securely attached;
Ensure that the associated switchgear are in safe position and operational nameplates are in secured condition;
Ensure test equipment are in well prepared to carryon, check the equipment next maintenance and calibration date is not expired;
Ensure PPE for all as where necessary, then assign adequate staffing resources with required competencies to safely complete task, confirm electrically safe for electrical work;
Use roadway warning signs and barricading by warning tape to control vehicle and pedestrian traffic around working area and relevant exclusion zones around live parts.