Water drops from scrubber system (27Aug2016)

Wet scrubber systems using seawater or freshwater uses big amount of water to dissolve SOx included in the exhaust gas from marine diesel engines. Most of the sprayed water goes down to the drain, but some of the carry-over condensates by the exhaust gas flow and condensates created after the outlet of scrubber units may generate water drops falling on the ship.


Various efforts have been made to remove the water drops falling on the ship: large heater, induction fan, and mist eliminator. Large heaters heat-up the flow to evaporate condensates but requires electric power. Induction fans would be a good choice but the entire scrubber system depends on the fan, which may add some large back pressure to the exhaust gas pipe system. Mist eliminator uses static filter so called as ‘chevron mist ‘, which collects condensates and drains. Problem with the mist eliminators are filter blockage and large size.


Manufacturers of ‘Chevron’ type mist eliminators recommend that the flow speed when passing through the filter units would be limited to be 2.5m/s (as slow as possible, of course). This is a tough requirements for applications like scrubber systems.


  • Exhaust gas flow speed is around 25~30m3/s within exhaust gas pipes.
  • To reduce the speed, cross section area should be increased by almost 10 times of exhaust gas pipes.
  • When the filter unit is installed horizontally, draining of collected condensates becomes an issue unless the cross section diameter is increased more than 3 times of existing exhaust gas pipes…this is why most of the scrubber manufacturers in the market should have a huge diameter in the demister section.


Through the past project experience, STI has gains enough experience to deal with the condensates. STI provides small-scale and blockage-tolerant demister system together with its SOx scrubber system.


Please feel free to contact STI for additional information to deal with the condensates from scrubber system. scrubber@simulationtech.co.kr


27 August 2016, STI

ESD System for LNG carriers – New IGC Code (11Aug2016)

Emergency Shutdown (ESD) System for LNG carriers takes important role to protect the ships from damages caused from fire or explosion, and other causes. Guidelines from SIGTTO states the role of ESD system as,


  • ESD-1
  • Cargo tank overflow control
  • Cargo tank pressure protection
  • Gas burning safety system


IMO Resolution MSC.370(93), called as New IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk), is the internationally accepted requirements including  ESD systems for LNG carriers. The new IGC code adopted on 22 May 2014 applies to New Builds whose keel laying is on or after 1 July 2016 as well as existing ships constructed on or after 1 July 1986 and before 1 July 2016, §1.1.1 MSC.370(93). Also, suggests that Authorities should ensure that the requirements in the new IGC codes are complied with, § MSC.370(93).


Implications to the ESD system on LNG carriers, §13.8.10 MSC.370(93),  is that the system development and maintenance should be in accordance with the  requirements in


  • Development: International Electrotechnical Commission standard ISO/IEC 15288:2008 Systems and software engineering – System life cycle processes
  • Maintenenace: ISO 17894:2005 Ships and marine technology – Computer applications – General principles for the development and use of programmable electronic systems in marine applications.

There are technical changes in the system configuration for new ships and existing LNG carriers to be made from ESD system point of view. More importantly, product life cycle management system for ESD system should be made and integrated with ship’s management system.


STI, as the main supplier of ESD systems for LNG carriers and their derivatives like LNG FPSO, LNG FSRU, and LNG RV, offers the ESD system upgrades and life cycle management system to integrate with ship’s management system.


For any inquiries about upgrading existing ESD system for LNG/LPG carriers and their derivatives, please contact STI.


11 August 2016




Project financing for SOx scrubber projects (11Aug2016)

Project decision about SOx scrubber installation to any shipping companies is not easy at all. Ship owners/operators should consider all aspects of technical, operational, and financial issues.


Among these, technical issues may be the easiest one as SOx scrubber manufacturers provide detailed project proposals including various technical issues. Project review from operational point of view have to do with fleet planning, voyage schedule, fuel price, and related operating costs. Ship owners may find the financial issue as the most difficult one because SOx scrubber projects requires big investment in the beginning. ROI of the SOx scrubber projects with STI is considerably short, but upfront investment is still a big burden to the client.


We learned that Korea Export and Import Bank (www.koreaexim.go.kr) offers “Export Facilitation Loan“, and SOx scrubber projects may fit into the category. For those Ship owners/operators who are interested in the SOx scrubber project financing, STI can check the possibilities and eligibilities about the project opportunities.


Any inquiries about the SOx Scrubber system inquiries, please contact STI at scrubber@simulationtech.co.kr.


10 August 2016


Join forces; SOx scrubber and Ballast Water Treatment System? (5Aug2016)

Combining SOx scrubber system andBallast water treatment system (BWTS) will benefit both systems.


SOx scrubber system uses seawater and discharges wastewater with decreased pH level. It is because MEPC puts pH criteria in the washwater, Section in MEPC 184(59).


For Ballast water treatment system (BWTS), low pH in the incoming seawater will help the system performance within the electrolysis.


Having some amount of washwater, of course PAH and turbidity should be controlled, stored onboard and mix with the ballast water to lower the pH value would be a way to improve the performance of BWTS.


Being able to have some storage capacity of washwater from SOx scrubber units can give a room to deal with sulfates in solid form, especially when operating in closed loop mode.


This is a preliminary idea to improve system performance and operability of SOx scrubber system and BWTS by combining them.


STI is looking for ways in this way.


Please feel free to contact STI for any questions about this issue.


Aug. 2016