Skip to content
HFLs & STFLs
Flying Leads

HFLs & STFLs

Hydraulic & Steel Tube Flying Leads

HFL and STFL assemblies interconnect subsea equipment, providing the transmission of hydraulic fluid, chemical, and service line connections. Each end is terminated to a ROV Free 'Fly to Place' stabplate housing self-sealing female hydraulic couplings.

3,000 m

Design Depth

Stabplate

Connector Type

Datasheet

HFL and STFL assemblies interconnect subsea equipment, carrying hydraulic fluid, chemical, and service line connections between units. Each end of the lead is terminated to a ROV Free ‘Fly to Place’ stabplate that houses self-sealing female hydraulic couplings, connecting every line within the bundle. Replaceable seals are contained within the female couplings for easy retrieval.

The leads are installed from deployment frames with ROV assistance, and are also capable of installation by the clump weight method. They are sufficiently flexible to allow handling by ROV and are negatively buoyant when the lines are filled with their normal operating fluids. The construction is robust enough to withstand the forces exerted during manufacture, transportation, installation and service life.

All materials used in the assemblies and ancillary equipment are compatible with each other and with most fluids, suitable for subsea use under normal service conditions for the life of field. Stabplates are manufactured from UNS S31803, with Hiduron 130 lockdown drive screws, UNS S31803 / UNS S32760 receptacle interaction components, and 316L stainless steel ROV buckets.

Key Features

  • Strain wire (up to 3T load capacity)
  • Multi-lifting points designed and tested to DNV 2.7-3
  • Bend restrictor / limiter and bend stiffener
  • Butt-welded and anti-rotation hose fittings
  • Hoses in accordance with ISO 13628 part 5
  • HFL on-bottom stability analysis using DNV RPF109
  • Variable minimum installation height to suit client requirements
  • Transportation frame supplied

Materials

UNS S31803UNS S32760Hiduron 130Stainless Steel 316L

Applications

  • Interconnection of subsea equipment.
  • Transmission of hydraulic fluid, chemical and service line connections.
  • Installed from deployment frames with ROV assistance, or via the clump weight method.