Onshore Pipeline Installation Works

Onshore Pipeline ICCP System:

For deep-well anode groundbed installations, steps to be followed on site are as follows:

Exact location of borehole is determined, surveyed and controlled prior to installation works by surveyor and experienced CP engineer.
All excavation and earth work necessary to prepare the drilling is completed.
Casings are installed in accordance with project drawings.
While adjusting casing string to final level, it is gripped with an appropriate clamp. A string may be released from the rig and kept in place.
Bore hole is flushed / cleaned upon casing installation by using water lifting method until no mud or otherwise contaminated water occur at the surface.
Ensure that all anodes and anode cables are free from damage prior to installation.
Pre-assembled anode strings are lowered to the designed level and temporarily secured from the top end to flexible holding device.
Ensure that the weight of the all equipments are pulled by the rope so that there is no high tension occurs on the cables.

For horizontal anode groundbed installations, steps to be followed on site are as follows:

Ensure that all relevant site conditions and working practices are observed. If necessary,
Excavate to the required depth of anode bed as shown in project specific drawings.
Before placing the MMO anodes, backfill material is poured according to amount indicated in material list.
Place the anodes in the required position. Distance between anodes are provided according to construction projects

All related drawings are considered for TR Unit installation works. TR unit are inspected to ensure that internal connections are mechanically secure and that no damage exists. Cable tagging inside the TR unit is done according to the project specifications.

DC output cables are terminated securely in the cable gland plate of the Transformer Rectifier. DC positive cables are not terminated inside of the TR until pre-commissioning and the final cable termination is done at the time of pre-commissioning.

Onshore Pipeline Galvanic System:

During galvanic anode installation, following steps are done:

Number of anodes are in accordance with TP schedule.
Electrical continuity of anode cable connections are checked against broken cables. All cable connections are done in such a way that all of them are in serial circuit.
Itis ensured that there exists no other structure (foreign pipeline etc.) at excavation zone.
To ensure that full soil contact, plastic cover is removed from the anode.
Min. 20 lt. of water is added to ensure sufficient water sorption before backfilling works.
Minimum anode to pipe distance (according to project drawings) needs to be ensured
Depends on site conditions and anode distribution along pipeline, anodes shall be placed at either both sides or one side of pipeline.

Test posts are placed as per Drawings and Concrete foundation of test post is aligned to ensure stability during backfill.