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Castrol Transaqua HT

Castrol Transaqua HT

Product description

Castrol Transaqua™ HT is a water-based hydraulic control fluid specifically formulated for use as the control medium in subsea production control systems. The fluid incorporates all the features required for operation throughout the control system including Sub Surface Safety Valves (SSSV) and intelligent well completions.

Transaqua HT has been developed and qualified under a Quality Management System with ISO 9001 Certification for Research and Development.

Qualification testing carried out in accordance with ISO 13628-6 Annex C (2006 E) requirements.


Tested according to OSPAR requirements. Rigorous environmental testing has also been completed in many geographies worldwide.

Contains a fluorescent leak tracer to allow rapid detection of subsea leaks either visually or using a dedicated ROV mountable leak detection sensor.

Maintains corrosion performance with seawater contamination.

Tolerant of the high well temperatures encountered by those parts of the control system located at the well bore.

Fully compatible and miscible in all proportions with other products in the Castrol Transaqua range and most other water-based subsea control fluids.

Compatible with a wide range of materials commonly used in subsea control systems (see Tables 3 & 4). More detailed compatibility information is available on request.


Designed for use in all conventional and high pressure, high temperature applications (according to API 17 TR8).

Can operate over a temperature range of -30ºC (-22ºF) to 170ºC (338ºF).

Passed ISO 13628-6 Annex C (2006 E)/API 17F TR8 testing at 170°C (338°F)

Track record of use in subsea production control systems at tempertures up to 170°C (338°F)

Tested to 180°C (356°F) in SSSV Equipment to OTO 99 001

Suitable for use within Electro-Hydraulic Multiplex (EH-Mux) or direct hydraulic control systems.

Designed for use throughout the entire production and work-over control systems, covering Topsides and Subsea applications: both open water and well bore; and Downhole from control of a single SSSV through to complex intelligent well completions

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