Propulsion News

Thursday, September 21, 2000
PBCF Aids Propulsion Efficiency Propeller Boss Cap Fins (PBCF) is a propeller enhancing device, which is designed to cut fuel consumption and exhaust gases by up to five percent while incurring no additional maintenance cost once installed. The unit, according to H. Yumoto Manager of PBCF Div. Mitsui O.S.K. Techno Trade, Ltd., is now operational on 720 ship worldwide. The PBCF rectifies the propeller hub vortex and recovers rotational energy otherwise lost in the propeller slip stream. Increasing propeller thrust by over one percent and reducing propeller torque by over three percent, the PBCF reportedly results in fuel savings of up to five percent or compared to vessels operating at equivalent speeds but without the PBCF, alternatively, a 1.5 percent increase in speed at the same engine output.

The PBCF is designed to eliminate propeller hub vortex, resulting in reduced stern vibrations, propeller noise, and noise contamination in marine acoustic equipment. It also reportedly resolves a number of rudder erosion problems.

The PBCF is a boss cap with fins made from the same material used in conventional boss caps and installed in the same way. This means the PBCF, like conventional boss caps, does not require additional maintenance once fitted, and can be easily replaced. A number of vessels, (oil tankers, containers, etc.), have been retrofitted with the PBCF whilst at sea.

When replacing conventional boss caps with the PBCF, no shaft design reviews are required by classification societies such as AB, CR, GL, KR, LR, NK, and NV.

About 40 percent of PBCF's sold to date have been retrofitted to running ships, the remainder have been fitted to newly built ships. By installing the PBCF at either the ship building stage, or during shaft inspection for running ships, extra shipyard costs can be avoided. The PBCF was developed jointly by Mitsui O.S.K. Lines, West Japan Fluid Engineering Laboratory Co. Ltd., and Mikado Propeller Co. Ltd., and is now patented in 12 countries. In 1994, the sales right of the PBCF was moved from Mitsui O.S.K. Lines (MOL) to one of her subsidiaries. A few subsidiaries have held the sales rights since then, but in April this year Mitsui O.S.K. Techno -Trade Ltd., PBCF Division took over responsibility for sales of the PBCF. Through license agreements, Mikado Propeller Co. Ltd., Nakashima Propeller Co. Ltd., and Samsung Heavy Industries Co. Ltd. have a restricted license to sell and produce the PBCF. Mikado Propeller Co. Ltd. has sold around 310 units, primarily to smaller domestic vessels including pleasure and/or fishery boats. Nakashima Propeller Co. Ltd. has sold 9 units to mainly medium sized vessels, and Samsung Heavy Industries Co. Ltd. has sold 9 units to larger sized vessels. Lynn Gear Plant Upgraded

GE Marine Engines will invest in substantial upgrades to grinding, inspection and hobbing equipment used at its Lynn, Mass., Gear plant over the next year. The first production pieces to be produced with this new equipment will be high-speed pinions and gears for the U.S. Navy's current DDG destroyer program. "We've taken a 20-year step forward with this large investment in new equipment, which translates into long-term value such as greater grinding accuracy and gear reliability," said Bill Gehr, manager Gear Programs for GE Marine Engines. "With this sophisticated technology, GE will be able to produce quiet, more reliable gearing with enhanced load capacity by holding tooth tolerances within .00005 inches — about 1/60th the size of a human hair." The new CNC form grinding equipment replaces the generation grinding equipment GE installed in the 80s. This high precision machine will enable the use of a CBN cutting wheel technology to profile grind marine gearing.


Marine Propulsion

US Navy Ships Conduct Astern Replenishment-at-sea

“While replenishments-at-sea are routine, astern refueling is unique and requires precise navigation and coordination,” said Lt. Cmdr. Jason Ileto, fleet replenishment scheduler for Commander,

Better Turbocharger Performance, Proven Tech

Engineer wisdom: Nothing is worse as the right idea at the wrong time. But with the new ECOCHARGE Two-Stage Turbocharging System MAN D&T has reached both goals.

MN100: Reintjes GmbH

The Company: Founded in 1979, Reintjes GmbH is an independent propulsion technology company that manufactures thousands of gearboxes annually. More than 90,000

Ship Repair & Conversion

Royal IHC Upgrades TSHD Pump for Van Oord

Royal IHC informs it has completed the upgrade of the underwater pump and jet water system on trailing suction hopper dredger (TSHD) VOLVOX TERRANOVA for Van Oord.

Five Minutes with Paul Switzer

Five minutes with Paul Switzer - Manager, Shipbuilding & Offshore, Viega   For readers not familiar with Viega, please give a ‘birds eye’ view, putting the company

MN100: Metal Shark Boats

The Company: Metal Shark is a leading shipbuilder specializing in the design and production of boats and ships for military, law enforcement, fire rescue, and

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Offshore Oil Pipelines Pod Propulsion Ship Electronics Ship Repair Ship Simulators
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.0658 sec (15 req/sec)