High Pressure Testing with Mate/ De-Mate Actuation

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One essential part of KW Designed Solutions engineering design process is to fully understand the critical functionality of our customer’s products under test and their unique requirements, to ensure industry standards are maintained.

The offshore energy industry demand that subsea wet-mate electrical connectors used for power, control and communications are comprehensively tested; proving their robustness and reliability in the most realistic and hostile operating environments.

KW Designed Solutions developed and engineered an advanced range of high-pressure vessels that have automated mate/ de-mate mechanisms incorporated into their design; meeting these strict testing requirements in line with API standards.

Integrated tooling and multi-penetrations allow for adaption to all types and sizes of wet-mate electrical or hydraulic connectors. This allows the user to simulate functionality, operation and connectivity of the male/ female connectors, whilst under pressure; ensuring robustness and reliability after hundreds of cycles.

Our mate/ de-mate system allows both single-step and cyclic-step sequential functionality; with set datum, adjustable travel distance for mate and de-mate positions, intermediate hold/ pause times, cycle repetition and simply to start, stop or reset a cycle.

pressure vessels which have automatic mate/de-mate mechanisms used whilst pressure testing subsea wet-mate electrical connectors


  • Balanced Stab Rods with Through Bore and Cable Gland Attachment
  • Compact Linear Actuation with Various Stroke Lengths
  • Connector Misalignment Capability
  • Integral Tooling for Multiple Connector Attachment
  • Programmable Speeds, Distances, Steps and Cycles
  • Single Step to Cyclic Step Sequencing with Set Datum Reference
  • Slow Speed Setting with Jog Functionality for Product Set-Up


  • Allows the Creation of Advanced Testing Platforms; Simulating Real-Life Functionality That Exceeds the Requirements of API Standards
  • Angular Misalignment can be Induced to Simulate ROV Manipulation
  • Central Bore in Stab Rods Enables the Attachment of High-Pressure Glands; Sealing Off the Client’s Electrical Cable’s
  • QCDC Couplings Can Be Mechanically Operated Whilst Subject to Hyperbaric Pressure
  • Subsea Electrical Connectors can be Physically Mated and De-Mated During Electrical Testing
  • The Mate/ De-Mate System Drive System is Neatly Incorporated into Closure Design; Saving Space

Applications and Customer Uses

An air-mate and de-mate mechanism is provided on pressure vessels, for customers who manufacture equipment for the subsea industry, that require the ability to conduct wet-mate electrical connector testing (the mate/ de-mate actuation of electrical connectors) or hydraulic valve testing in line with API 6A.

Project Example

High Pressure Testing Subsea Electrical Connectors

Designed and manufactured advanced high-pressure testing systems for subsea qualification and production testing a series of the world’s highest-rated mateable subsea electrical connectors.

High-pressure testing vessels, two at 3 meters and one at 6 meters in length, complete with fully automated fluid control modules and pressure and temperature control systems for a global provider of oil and gas services.

Subsea Electrical Connector Testing