Singapore-based Keppel Singmarine said it has secured three newbuild contracts worth over $140m.

The first among the contracts has been awarded by Dutch dredging and marine contractor Royal Boskalis Westminster to build a rock dumping fall pipe vessel.

The 159m-long rock dumping fall pipe vessel, with a displacement capacity of 23,000t, can deposit large amounts of rocks in deep water with great precision to protect and stabilise cables and oil and gas pipelines on the seabed.

The vessel will feature propulsion machinery and special rock handling equipment supplied by Boskalis to carry out accurate rock depositing works at water depths of more than 1,000m with Dynamic Positioning capabilities.

Additional features of the vessel include a flexible fall pipe with a remotely operated vehicle to lower the rocks at a controlled rate.

Construction of the vessel is expected to be complete in late 2011.

The second contract involves building a 65t bollard pull twin-screw Azimuth Stern Drive (ASD) tugboat with FiFi1 notation for fire fighting for Dutch maritime services company, Smit International.

The final contract is for a 50t bollard pull twin-screw ASD tugboat for an Indonesian customer.

Construction work on the tugboats is scheduled to be complete by the end of 2010.