The Q1400 Trenching system has the capability to perform jet trenching in soils of up to 100 KPA and mechanical chain cutting of soils of up to 250 KPA. The system consists of a “common trenching module” and separate tracked “jetting and mechanical cutting skids” with a customised launch and recovery system (LARS) rated to Lloyds sea state 6.
In jet trenching mode, the Q1400 has 1100kW (1475 hp) of available power, 800 kW of this power is via variable speed drive (VSD) electric motors with direct drive water pumps. The jetting tool has twin-legged parallel jet swords. The system is designed for trenching up to 3m in soil conditions ranging from 5 KPA to 100 KPA (using 2m & 3m jetting swords); and is capable of accommodating products up to 900 mm in diameter. The sophisticated jetting system also has the capability for backwashing, eduction and back filling of seabed material.
The flexibility of the Q1400 trenching system is illustrated when it is operated in the chain-cutting mode. In this mode it is configured with a 2m x 400mm chain cutter coupled with an instrumented cable bell mouth and depressor with a 3m minimum bend radius (MBR) and two product-loading arms. It has a dedicated HPU for the chain cutter. The system has the capability to accommodate flexible products up to 250mm diameter.
The Q1000 Jet Trenching ROV embraces the latest technologies in jet trenching and ROV design. With 1,000 horse power of total installed and variable jetting power, the Q1000 is capable of trenching pipelines, umbilicals and cables to depths of 3m. The submersible is designed for pre and post-lay trenching as well as simultaneous lay and burial in the offshore subsea cable sectors.