Sodium hypochlorite dosing skid 


ICR was approached by a major North Sea operator to design and manufacture a bespoke, permanent Injection Pump Package for dosing of Sodium Hypochlorite to four seawater lift pump caissons on a UKCS Platform. 


ICR supplied a package with 4‐off air driven, API-675 dosing pumps for Sodium Hypochlorite dosing to respective seawater lift pump caissons. Each pump was served by a dedicated Solenoid Valve (SOV) to start / stop pump on signal from platform Integrated Control and Safety System (ICSS). 

The package included a back‐pressure control valve on each pump discharge line to prevent syphoning of the sodium hypochlorite solution from existing hypochlorite storage tank. 

The package comprised of the following: 

  • 1 of painted carbon steel base frame c/w titanium drip tray 
  • 4 off (4 off duty) Williams Milton Roy CRLD200-TI-TFE air driven hydraulic actuated diaphragm chemical injection pumps 
  • Process tubing, fittings, and wetted metallic parts supplied in Grade 2 Titanium. 
  • Suction manifold incorporating all valves, suction filter for each pump and common calibration pot 
  • Discharge lines for each pump incorporating a pressure relief valve (PRV) routed to pump suction, pressure indicator, back pressure control valve and isolation valve 
  • Air manifold incorporating isolation valves, filters, and regulator 
  • Pneumatic installation on the package incorporating 4‐off SOVs (each supplied with manual override) on each pump supply (for individual pump start/stop control) 
  • Instrument junction box, located at skid edge to facilitate connection of client cabling 
Results & Benefits 
  • Fully assembled package delivered to site, minimising hook-up, and onsite work requirements 
  • Bespoke package designed, built and fully tested to meet client specifications and process parameters.