Mark IV-HA High-Availability Subsea Multiplex Control Pod | SLB

Mark IV-HA

High-availability compact subsea multiplex control pod

Installation of a control pod used in our MUX systems being lowered into the ocean.
Installation of a control pod used in our MUX systems being lowered into the ocean.
less risk of pull
Improved reliability
Fewer tubing connections

Featuring an industry-first three-POD design, the Mark IV control pod improves operational availability of the drilling system through redundancy and improves reliability through simplified POD design.

How the Mark IV pod improves operations

Conventional subsea BOP control systems use a two-POD design, providing a single spare if the primary control POD becomes unavailable. The Mark IV-HA control system system’s third POD provides additional redundancy, which eliminates the need to pull the stack if one POD fails.

  • Improve reliability by up to 98%
  • Reduce the likelihood of a POD-related stack pull by up to 73%
  • Reduce potential for leak paths with 50% fewer tubing connections
  • No single point of failure within the POD
  • 33% more available functions to accommodate eight cavity stacks
  • Eliminate the chance for human failure and reduce maintenance costs with pressure-compensated pilot accumulators that automatically adjust for water depth
  • Increase platform efficiency with 26% smaller system that weighs one-third less that competitors'
Mark IV-HA High-Availability Subsea BOP Control System Model

PODs and functions
Three PODs, each with 160 functions to accommodate eight cavity stacks
Tungsten carbide seals on small valves
Pilot accumulators
Automatically adjusting, pressure-compensated regulator pilot accumulators
46 in × 49 in × 14.5 in
23,000 lbm
  • API Spec 16D
  • API Spec 53
  • DNV Drill
Mark IV-HA
High-availability subsea BOP control system