Warning: Use of undefined constant _FILE_ - assumed '_FILE_' (this will throw an Error in a future version of PHP) in /home/vuser12/6/2/0207026/www.pbcf.jp/faq/index.php on line 14
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
boost ship's
speed by 2% (at same horsepower).
QDoes PBCF an other advantages
than energy saving?
A
・Reduction of torque-rich conditions.
・Reduction of stern vibration and underwater noise.
・Elimination of rudder erosion.
QHow is the PBCF effect
obtained?
APBCF will eliminate the Hub
Vortex.
QDoes PBCF effect change by the
size or type of
vessel?
APBCF will improve the propeller
efficiency and the
PBCF effect
essentially will not depend on the size or type of the vessel.
QDoes Slow-Steaming influence the
PBCF effect?
AYou can expect about 5% effect on
average at any
ship speed.
QIs there any negative effect for
Hull or shafting by installing
PBCF?
AThere is no negative effect in
any way.
We have installed PBCF over 3,300 vessels until now and there has been no problem for Hull or
Shafting.
QIn case of newbuildings, is it
necessary to change
propeller or
shaft design for installation of PBCF?
ANot at all
QIs there any effect for
ship-maneuvering
performance by PBCF?
AThere is no effect for
ship-maneuvering performance
(forwarding,
reversing, circling, stopping)
QWhy are the values of PBCF
effect analysis
scattered?
ASea Trial/Voyage Data on actual
vessels are
included the
interference in actual sea way, like wind, wave, sea current and there is a lot of variation in the
data.
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
a report.
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
installation fee?
ANo, installation fee has not
included in PBCF
price.
Installation is the scope of the customer and usually this is included in the customer's Dry-dock
planning.
QWhat is the installation time of
PBCF?
AIt takes about 5～6 hours by 4
workers.
QDoes your engineer attend during the installation?
AIn case of installation on
exising vessels at
Chinese dockyard,
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
installation?
A
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
maintenance?
ANo specific maintenance
instructions.
PBCF may follow the propeller maintenance. For example cleaning and polishing. Further we have no
objection
for special paint or coatings.
Design
QWhat drawings are necessary to
design PBCF?
A
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)
5) Rudder
QOf which material is PBCF
made?
AIt is Nickel-Almi-Bronze, same as
material as
propeller.
QCan we switch PBCF between our
vessels?
APBCF is custom made product based
on propeller
design per
vessel.
Therefore, PBCF cannot be switched unless completely sister vessel.
QAre PBCF fins removable?
ANo. PBCF is made by using
advanced casting
technology, as one
unit.
QAre there any moving parts on
the PBCF?
APBCF has no moving parts.
General
QWhat is "PBCF"?
AIt is an energy-saving device
installed on
propeller, improving
propeller efficiency.
QWhat does "PBCF" mean?
AIt is named after the initials of
"Propeller Boss Cap Fins".
QWho (& When) invented
PBCF?
AMitsui O.S.K. Lines, West Japan
Fluid Engineering
Laboratory
Co.,Ltd and Nakashimamitsuwa Propeller Co., Ltd. (ex. Mikado Propeller) has jointly developed PBCF in
1987.
QCan PBCF be installed only to a
new-building ship?
ANo, It can easily be installed on
both newbuildings
and existing
vessels.
QDoes PBCF need Class
approval?
ANo need. PBCF is not a class approval item same as normal boss
cap.
Certain class request to submit PBCF drawing but it will be arranged by MOL Techno-Trade Ltd.
QWhat is the Delivery time of
PBCF?
AIt takes usually 3 months from
receiving firm
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
install PBCF?
AAll type of merchant vessels, and
also high speed
vessels,
fishing crafts. PBCF is a propeller improver.
QWhat is included in the PBCF
price?
A
1) PBCF body
2) Accessories set (Original bolts, Calibrated Torque Wrench, Gasket, locking wire and installation
manual)
3) For delivery to East Asia by sea freight: transportation included (CIF at port East Asia)
QCan PBCF be installed on a
Controllable Pitch
Propeller (CPP) ?
AYes, basically possible. However
for some propeller
maker or
type of CPP installation of PBCF is impossible.
