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Flowlines testing

Automatically control flow, discharge & dosing

Hughes Pumps have been supplying Hydrostatic Test and Chemical Injection Systems (HTCIS’s) since 1999 to leading companies around the world to pressure test Flowlines (Flexible Lines/Risers) during installation offshore to depths of 2000m. Systems generally comprise of four modules.

The Filling System (FS) uses a stainless steel centrifugal pump at 50m3/hr at 10bar (150psi) to rapidly fill the Flowline with seawater. The Mid Pressure System (MPS) typically operates at 3 to 11m3/hr at up to 207bar (3,000psi) using an HPS2200 pump to increase the Flowline pressure at the required rate.

The High Pressure System (HPS) typically operates at 0.2 to 1.0m3/hr at up to 1035bar (15,000psi) using an HPS650 pump to raise the Flowline pressure to its maximum test pressure, normally 150% of working pressure, at a very finely controlled rate.

The Chemical Injection System (CIS) uses small dosing pumps to inject oxygen remover and biologic inhibitor into the discharge line, at controlled rates based on flow meter readings fitted to the FS, MPS & HPS pumps to maintain the required chemical concentrations.

The system is closed loop which automatically controls flowrates, discharge pressures & chemical dosing rates. Data logging equipment can also be incorporated if required. Simpler systems with manual control are also available.

Hughes Pumps manufacture the pumps which are at the heart of the system


  • Hughes Pumps have a track record of delivering quality solutions on tight deadlines
  • Hughes Pumps manufacture the pumps which are at the heart of the system
  • The pumps are high quality, all stainless steel wetted parts, slow running & heavy duty
  • Hughes Pumps has pump technology to 3000bar
  • Flexible approach to clients specifications & budgets, able to supply a simple system to full turnkey, PLC control
  • 40 years’ experience in supplying pumping equipment offshore & subsea


  • Subsea 7
  • Technip
  • Techdof
  • Odebrecht
  • Marine Production (Oceaneering)
  • MFX

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