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Frequently Asked Questions | PBCF｜ PBCF | MOL Techno-Trade, Ltd.
The most Reliable Energy Saving Device - Propeller Boss Cap Fins
AAverage 5% FO Saving Effect (at
same ship speed) or
speed by 2% (at same horsepower).
QDoes PBCF an other advantages
than energy saving?
・Reduction of torque-rich conditions.
・Reduction of stern vibration and underwater noise.
・Elimination of rudder erosion.
QHow is the PBCF effect
APBCF will eliminate the Hub
QDoes PBCF effect change by the
size or type of
APBCF will improve the propeller
efficiency and the
essentially will not depend on the size or type of the vessel.
QDoes Slow-Steaming influence the
AYou can expect about 5% effect on
average at any
QIs there any negative effect for
Hull or shafting by installing
AThere is no negative effect in
We have installed PBCF over 3,300 vessels until now and there has been no problem for Hull or
QIn case of newbuildings, is it
necessary to change
shaft design for installation of PBCF?
ANot at all
QIs there any effect for
performance by PBCF?
AThere is no effect for
reversing, circling, stopping)
QWhy are the values of PBCF
ASea Trial/Voyage Data on actual
interference in actual sea way, like wind, wave, sea current and there is a lot of variation in the
QMay we ask MOL Techno-Trade to
assist in the
analysis of the
PBCF effect, after installation?
AUpon request, we will analyze
PBCF effect and submit
Installation & maintenance
QHow is PBCF installed?
APBCF is fastened to propeller
boss by bolts,
comparable to the
installation of conventional propeller boss cap.
QDoes PBCF price include
ANo, installation fee has not
included in PBCF
Installation is the scope of the customer and usually this is included in the customer's Dry-dock
QWhat is the installation time of
AIt takes about 5～6 hours by 4
QDoes your engineer attend during the installation?
AIn case of installation on
exising vessels at
we offer a service to dispatch our supervisor for installation at our expense.
In case of other area, the additional supervising fee is neccessary.
QWhat is the most important
regarding the PBCF
1) Position relation for Propeller Blade and PBCF
2) To use original installation materials, like fastening bolts, torque wrench.
3) Apply correct fastening torque to the bolts.
Installation is comparable to the installation of coventional propeller boss cap, without welding works.
QDoes PBCF need specific
ANo specific maintenance
PBCF may follow the propeller maintenance. For example cleaning and polishing. Further we have no
for special paint or coatings.
QWhat drawings are necessary to
1) Propeller (incl. propeller particular and boss cap)
2) Propeller blade offset table
3) Propeller Shaft (shaft end and propeller nut)
4) Stern arrangement (showing the clearance dimension between propeller and rudder)
QOf which material is PBCF
AIt is Nickel-Almi-Bronze, same as
QCan we switch PBCF between our
APBCF is custom made product based
Therefore, PBCF cannot be switched unless completely sister vessel.
QAre PBCF fins removable?
ANo. PBCF is made by using
technology, as one
QAre there any moving parts on
APBCF has no moving parts.
QWhat is "PBCF"?
AIt is an energy-saving device
QWhat does "PBCF" mean?
AIt is named after the initials of
"Propeller Boss Cap Fins".
QWho (& When) invented
AMitsui O.S.K. Lines, West Japan
Co.,Ltd and Nakashimamitsuwa Propeller Co., Ltd. (ex. Mikado Propeller) has jointly developed PBCF in
QCan PBCF be installed only to a
ANo, It can easily be installed on
QDoes PBCF need Class
ANo need. PBCF is not a class approval item same as normal boss
Certain class request to submit PBCF drawing but it will be arranged by MOL Techno-Trade Ltd.
QWhat is the Delivery time of
AIt takes usually 3 months from
order. (Based on
Delivery in East Asia)
In case of delivery to Middle East, Europe or other area, additional over 1 month will be needed.
QWhich types of vessel can
AAll type of merchant vessels, and
also high speed
fishing crafts. PBCF is a propeller improver.
QWhat is included in the PBCF
1) PBCF body
2) Accessories set (Original bolts, Calibrated Torque Wrench, Gasket, locking wire and installation
3) For delivery to East Asia by sea freight: transportation included (CIF at port East Asia)
QCan PBCF be installed on a
Propeller (CPP) ?
AYes, basically possible. However
for some propeller
type of CPP installation of PBCF is impossible.