UEJAPAN ENGINE CORPORATIONSERVICE ENGINEERING DEPARTMENT, SERVICE ENGINEERING SECTION
1, MINAMIFUTAMI, FUTAMI-CHO, AKASHI-CITY 674-0093, JAPANTEL. +81-78-949-0804 (direct), e-mail: sales2@j-eng.co.jp (parts & engineer order), service@j-eng.co.jp (technical inquiry)

Subject :(1/1)

Application

UEC Diesel Engine

TypeAll UEC
USI-10017E R1Guidelines for SOx scrubber application

No.

GeneralInternational Marine Organization (IMO) plans to reduce the sulfur content regulation value offuel oil step by step, which will become 0.5% or less from the current 3.5% or less in and afterJan. 2020 in General Areas (Global).
Therefore, it is necessary for all vessels to use fuel oil conforming to this regulation or to apply
an exhaust gas scrubber (SOx scrubber) after year 2020.
In the case of applying the SOx scrubber to UE engine, it is necessary to modify thespecification of turbocharger to obtain NOx approval from the viewpoint of securing theperformance and reliability of the engine.
And, we also recommend the measures in order to improve the reliability of the combustion
chamber components according to the engine model and specifications.
For the guidelines on this matter, please refer to the attached “WMS-F075”.
For further inquiries about the application of SOx scrubber, please contact the following
information desk.
(Information desk)
Japan Engine Corporation
After-Sales Department
Tel.: +81-78-949-0808
Common E-mail address: sales2@j-eng.co.jp

Plan record

The action priority indicated at the upper right corner is settled by Japan Engine Corporation originally and it does not decide the action of users.
Further, it is not guaranteed the every action carried out according to this service information.
The service information issued by Japan Engine Corporation included not only copyright but also all rights is reverted on Japan Engine Corporation.

Newly issued. 9th Aug. 2018 T.Y, T.N, D.Y
Rev.1 Revised the attached material.
8th Feb.2019 T.Y, T.N, D.Y

Approved

T. Yamamoto

SERVICE ENGINEERING DEPARTMENT

CheckedT. Nasu

SERVICE ENGINEERING SECTION

Designed

D. Yasuda

DATE OF ISSUE : 8th Feb. 2019

Guideline for SOx
Scrubber application

21st Dec. 2018, 5th edition (revision D)
30th Jul. 2018, 4th edition (revision C)
14th Feb. 2018, first edition
Development & Design Department

Revision D- Page 3 modified- Page 6 added

WMS-F075/D© 2018 Japan Engine Corporation. All Right Reserved.

1.
᪂఍♫䛻䛴䛔䛶Introduction
Regarding SOx scrubber application, we would like to explain ourguideline and recommendation as follows.
¾ Acceptable Exhaust gas back-pressure when applying SOxscrubber¾ Main Engine’s concerns and solutions for them
¾ Turbocharger re-optimization by changing parts¾ Effect of back-pressure rise on Main Engine¾ Engine performance when bypassing SOx scrubber¾ Max tolerance of back-pressure to comply IMO-NOx regulation© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

2

1. ᪂఍♫䛻䛴䛔䛶Acceptable
Exh gas back-pressure for SOx scrubber¾ Turbocharger specifications of UE engines are selected and optimized in orderto obtain a planned scavenging air pressure under condition that Upper limit ofback-pressure at MCR is 300mmAq. Therefore when back-pressure exceeds
300mmAq (at MCR), the turbocharger spec, change is required.
¾ Acceptable Exhaust gas back-pressure for SOx scrubber (Upper limit ofrecommended back-pressure) is as below.
Scrubber is to be selected under the upper limit of back-pressure.
㻌 㻌 㻌 600/485/435/340/255/150mmAq at 100/90/85/75/65/50%Load respectively.

© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

31. ᪂఍♫䛻䛴䛔䛶Acceptable
Exh gas backpressure for SOx scrubberNote)¾ In case of Scrubber is bypassed at high engine load, back-pressure drop canlead T/C outlet gas temperature decrease.
¾ Above back-pressure drop is acceptable for the engine.
¾ If this temperature decrease is not acceptable for vessel’s operation, thepressure drop can be compensated by providing an equivalent resistance inthe bypass line.

© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D41.
᪂఍♫䛻䛴䛔䛶
Main
Engine’s Concerns and Solutions for them
1. Engine Performance and Reliability¾ Exhaust gas back-pressure rise Î Scavenging air pressure (Ps) dropÎ Reliability degradation of Combustion chamber components (Hot parts)
䛆Basic measure䛇㻌 Turbocharger Nozzle spec change㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 Î Ps is to be adjusted equal or higher than the original condition
䛆Optional measure䛇 Hot parts upgrade or replacement is recommended.
It depends on engine type and its specifications㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 Î Please contact us for more details.
Periodical maintenance and parts replacement for Fuel Valve, cylinder
lubricating quills (SIP valve, ECL valve), ECL distributor and Turbocharger
consumable parts are also recommended.

¾ Exhaust gas back-pressure rise Î T/C surge margin decreaseÎ Risk of T/C surging increase㻌㻌䠄Not critical, but to be confirmed on each engine group)䛆Basic measure䛇㻌 Turbocharger Diffuser spec change (case by case)㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 㻌 Î Proper surge margin is to be secured.
¾ Turbocharger spec change is required when Exhaust gas back-pressure
exceeds 300mmAq (at MCR). Turbocharger matching test for newmanufacturing engine or T/C Spec re-select and change for in-service vessel
is required.
WMS-F075/D© 2018 Japan Engine Corporation. All Right Reserved.

51.
᪂఍♫䛻䛴䛔䛶
Main
Engine’s Concerns and Solutions for them
For new building engines, the shop test (including Turbocharger matching test andNOx approval test) will be carried out according to following scheme.
5HIHUHQFH 6FUXEEHU
1RWDSSOLHG

6FUXEEHU
5($'<1RWIL[HG 6FUXEEHU
5($'<:KHQ3EDFNHWF
DUHGHFLGHG‫ك‬

6FUXEEHU$SSOLHG

7&VSHFQRUPDO
3EDFNQRUPDO䖵㻌䖵



7&VSHFQRUPDO
3EDFN+LJK



7&VSHF)RUVFUXEEHU
3EDFNQRUPDO 6FUXEEHU%\SDVV 





7&VSHF)RUVFUXEEHU
3EDFN+LJK䖵㻌

䖵㻌Regarding “Scrubber READY”, if application date and back pressure aredecided, the shop test with turbocharger specification for scrubber and highback-pressure is recommended.

© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D61.
᪂఍♫䛻䛴䛔䛶
Main
Engine’s Concerns and Solutions for them
䠎䠊IMO-NOx regulation¾ Turbocharger spec parts ,which are one of NOx mandatory components,
are to be optimized.
䛆Basic scheme䛇 Main Engine for new building vessel
NOx approval test under new planned back-pressure is required.

 Main Engine for in-service vessel
Submission and approval obtainment of“Amendment to NOx Technical File”. (Under discussion with Class NK*)(*Remarks: To be discussed with other classes after receiving
owner’s requirement.)© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

7

1.Turbocharger᪂఍♫䛻䛴䛔䛶
spec change parts
Cross section ofMET turbocharger(Gas outlet guide)(Turbine blades)
Replacement of above
consumable parts is also
recommended, depending
on working hours andconditions.

Diffuser䠄Compressor side䠅© 2018 Japan Engine Corporation. All Right Reserved.

Nozzle䠄Turbine side䠅
WMS-F075/D

8

1.
᪂఍♫䛻䛴䛔䛶
Effectof back-pressure rise on Main Engine
Effect of back-pressure rise on Main Engine performance is shown as below table.
Graphs are also available for referred.
%DFNSUHVVXUH5LVH 0&5/RDG/RDG
PP$T
PP$T
PP$T6)2&>JN:K@

7HPSEHIRUH7&>GHJ&@


PP$T‫ق‬,62FRQGLWLRQ‫ك‬
PP$T PP$T$LUDQG*DVIORZ>@
7HPSDIWHU7&>GHJ&@© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

9WMS-F075/D

101.
᪂఍♫䛻䛴䛔䛶
Effectof backpressure rise on Main Engine© 2018 Japan Engine Corporation. All Right Reserved.

1.
᪂఍♫䛻䛴䛔䛶
Effectof backpressure rise on Main EngineWMS-F075/D© 2018 Japan Engine Corporation. All Right Reserved.

111. ᪂఍♫䛻䛴䛔䛶EnginePerformance when bypassing SOx scrubber
For vessel with SOx Scrubber and Turbocharger spec has been changed, whenthe Scrubber is bypassed, back-pressure can drop to the original/normal levels
and engine performance may change as below. Below values show difference
from the original engine performance under the original back-pressure and theoriginal turbocharger spec.
‫ق‬,62FRQGLWLRQ‫ك‬%DFNSUHVVXUH5LVH
EHIRUH%\SDVV
0&5/RDG


/RDG


PP$T
PP$T
PP$T6)2&>JN:K@




7HPSEHIRUH7&>GHJ&@


© 2018 Japan Engine Corporation. All Right Reserved.

PP$T
PP$T
PP$T$LUDQG*DVIORZ>@

7HPSDIWHU7&>GHJ&@






WMS-F075/D

12

1. ᪂఍♫䛻䛴䛔䛶
EnginePerformance when bypassing SOx scrubber© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

13

1. ᪂఍♫䛻䛴䛔䛶
EnginePerformance when bypassing SOx scrubber© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

141. ᪂఍♫䛻䛴䛔䛶
Max
tolerance of back-pressure regarding IMO-NOx¾ T/C back-pressure may be limited according to IMO-NOx documents.
㻌 㻌 For Engine Groups which NOx emission test was held after 1st July 2010
(NTC2008(*) validated), the max tolerance of backpressure is referred toNOx emission test report.
(*) NTC2008䠖
NOx Technical Code 2008. It entered in force from 1st July 2010. “Max tolerance” isrequired when NOx emission evaluation and It was set by each Engine maker and applied
to Engine Groups which NOx emission test was performed after 1st July 2010. Max
tolerance back-pressure of UE engines (IMO-NOx Tier I and II) is 450mmAq at MCR.

¾ When SOx Scrubber is applied, above max tolerance will be changed, dependingon back-pressure increase level. Referred to next pages.
㻌㻌㻌㻌Attention:
Max tolerance is the worst case after in-service and not to be used for Scrubber planning.
Therefore, when back-pressure rise over 300mmAq (at MCR), even it is lower than max
tolerance 450mmAq, turbocharger spec is to be changed.
When scrubber planning, back-pressure should be lower than e below than “Acceptable
Exh gas back-pressure for SOx scrubber (Upper limit of recommended backpressure)”.
© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D151. ᪂఍♫䛻䛴䛔䛶Max
tolerance of backpressure regarding IMO-NOx© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D

16

Max1. ᪂఍♫䛻䛴䛔䛶tolerance of backpressure regarding IMO-NOx© 2018 Japan Engine Corporation. All Right Reserved.

WMS-F075/D17