Why do I need an SCR System for my Ship / Vessel?

In order to control the NOx emission from burning of marine fuels like:

  1. Heavy Fuel Oil
  2. Light Fuel Oil
  3. Marine Gas Oil
  4. Diesel

Marine Selective Catalytic Reduction (SCR) system is installed as an after exhaust treatment system. A reducing agent, in this case, SeaCrestor – 40% Urea Solution is used to react with the NOx to form less harmful gases.

Who will need SeaCrestor – 40% Marine Urea Solution?

A general rule will be marine vessels that needs to berth in countries under the Emission Control Area (ECA) regions set by IMO through MARPOL Annex VI.

Some of the vessel type that we have experience supplying SeaCrestor – 40% Marine SCR 40% Urea Solution:

  • Cruise Ship
  • Offshore Support Vessel
  • Deep Sea Cable Laying Ship
SeaCrestor is our share to a greener environment! Get a free quote now!


Specifications of SeaCrestor – 40% Marine Urea Solution

Parameters Unit Values
Urea % (m/m) 39 ~ 41
Alkalinity as NH3 % (m/m) < 0.5
Biuret % (m/m) < 0.8
Aldehydes mg/kg < 100
Insoluble matter mg/kg < 50
Phosphate(PO4) mg/kg < 1
Sodium mg/kg < 1
Calcium mg/kg < 1
Iron mg/kg < 1
Magnesium mg/kg < 1
Potassium mg/kg < 1



2 Responses to Why do I need an SCR System for my Ship / Vessel?

  1. Dear Sir,

    We would like to know to what temperature we have to maintain a 40% urea solution, during storage, when sailing in air temperatures of -20 C.

    Best regards,


    • Dear Paul,

      It’s crucial to maintain the storage at least above 3 degree Celsius. We suspect that urea crystals will start to form when the temperature drops. Hope this answers your question. Currently we are conducting a study to further understand the properties of the 40% Marine Urea Solution. We’ll keep you updated on the study outcome.

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