Dropped object protection

In a wide variety of offshore operations, impact loads from dropped objects pose a high potential threat to pipelines on the seabed. To minimise the impact of dropped objects, we offer custom designed culverts or concrete mattresses engineered specifically to protect pipelines.

Hybrid systems comprising rock and mattresses can be deployed over exposed pipelines to provide equivalent depth of cover.

FAQ’s

What impact protection energy absorption is typically provided by concrete mattresses?

Subcon’s standard mattresses can absorb the energy of a 20Te anchor which is industry standard and is designed in accordance with DNV-OS-F101

What are the main parameters required for the design of dropped object protection (DOP)?

The key parameter for DOP design is the expected impact energy of a dropped object, which is influenced by the weight and shape of an object. DOP also needs to be designed for the seabed soil type and to be stable for the design environmental criteria.

What other external factors can pose a threat to a pipeline that can be mitigated by Subcon’s dropped object protection product?

Vessel anchors or trawling fishing gear impacts can also be deflected by protective measures. Subcon has a range of overtrawlable structures that can be used for Subsea Isoltation Valves (SSIVs) and well head covers.