TIS Subsea HPUs are designed to control and monitor subsea trees and associated subsea equipment during well intervention operations, and are typically accompanied by an Umbilical Reeler as part of complete Subsea Landing String (SLS) or Intervention Workover Control Systems (IWOCS). TIS Umbilical Reelers are designed to deploy and recover any length and diameter of umbilical product, with suitable controls to facilitate multiple hydraulic, chemical, electrical and fibre optic power and signal cores.

This topside controls package was used for the client’s electro-hydraulic landing string, typically deployed as part of a system for subsea exploration and appraisal operations. The PLC Controlled HPU was built and certified in compliance with DNV-ST-E271 and CE ATEX Zone 2, The STT HPU was built and certified in compliance with DNV-ST-E271 and CE ATEX Zone 1, while the reeler was built and certified in compliance with DNV-ST-E273 and CE ATEX Zone 1.

The Hydraulic Power Unit (HP-U-1015) was built to client specification to provide both 7,000psi and 12,000psi supplies to 10 subsea lines, and was controlled via a programable logic controller (PLC). Control fluid was delivered from 700L supply and 300L return reservoirs to the HP and MP circuits via electric pumps, with pneumatic pumps also on each circuit to provide redundancy as well as boosting pressure to reduce charge up time. Four high pressure 30L accumulators and two medium pressure 25L accumulators were located in a dedicated section on the outside edge of the HPU while remaining within the unit’s envelope, for the purpose of eliminating operator exposure to risks of stored gas at pressure. The PLC was programmed with the client’s proprietary software, and powered by from an uninterrupted power supply (UPS) 24Vdc output, with the UPS input supplied by a transformer secondary winding 440Vac.

The Surface Test Tree HPU (CU-W-1033) was built to client specification to provide 3,000psi controls to the Kill Wing, Flow Wing, Swab & Master Valves, and to also provide 10,000psi controls to two Lubricator Valves. The Flow Wing valve was configured to “Fail Safe Close” philosophy having a single control line, while all other valves were double acting, with each output allowing both open and close control over the respective actuators.

The Umbilical Reeler (TU-A-1044-1) was purpose built to suit the client specified umbilical’s cores comprised of nine hydraulic lines, two chemical line, two power cables (each with 30 conductors), and two data cables (each with four conductors). A traverse spooling head sub-assembly was designed specifically to suit the umbilical OD, with two stainless steel endless screws synchronising the distance the spooling head travels per rotation of the reel to provide perfect even wraps to the drum. The spooling system rotates around the top half of the drum to provide a 180⁰ range of horizontal and vertical spooling angles, allowing the client multiple options of where to site the reeler to for the deployment arrangement during operations. A large marine duty disc brake with fully adjustable braking force allows line pull value to be set so that the reel will slip to protect the safe working load of the umbilical. The design houses a 12-pass hydraulic slipring and multi-pass electric slipring to allow for live signals on all umbilical lines while the drum is rotating during deployment.

The Workshop Container (WS-A-1001) was designed to provide a safe and practical workshop space within a DNV-ST-E271 and CE ATEX Zone 2 certified container, featuring, fire & gas alarm, PA system, telephone, emergency lighting, first aid kit, workbench & vice, sliding chain hoist, shelving & cupboards. The various transportation baskets and support stands were designed specifically to handle the client’s proprietary equipment.