Bureau Veritas Launches Elastic Shaft Alignment Notation

MarineLink.com
Tuesday, June 25, 2013

Classification society Bureau Veritas has introduced a new set of requirements for shaft alignment on high powered ships. The ESA notation will help ensure the integrity of the structure and shaft bearings on very large vessels such as ultra-large container ships and the next generation of very large LNG carriers.

Jean-Francois Segretain, deputy technical director, Bureau Veritas, said, “As ships grow in size and we seek more fuel economies we are now seeing vessels with shafts handling over 20MW of power driving large diameter propellers of over 30 tons weight. Critical attention has to be paid at the design stage to analyzing the elastic shaft alignment and ensuring that the bearings and structure match the shaft response, especially when the vessel is turning. If this is not done, huge forces will either lead to bearing failure or excessive vibration. We have been called in to help solve incidences of both on new ships. This new ESA notation sets out standards of how the shaft must be analyzed and the criteria the whole shaft, bearings, and aft structure must meet to avoid such problems.”

Bureau Veritas has unrivalled experience with shaft alignment studies dating back to the first ULCCs built in the 1970s. It is continually updating its expertise in this area and has developed special software for shaft analysis.

The Elastic Shaft Alignment (ESA) notation will apply to vessels with shafts in excess of 750 mm diameter, or smaller shafts handling over 20 MW of power, propellers over 30 tons or using synthetic bearings. The notation requires full analysis of the criteria covering hull flexibility with respect to loading conditions, bearing material stiffness, shaft speed and oil film behavior.

Says Segretain, “We will make this notation obligatory for ships meeting these conditions in our class, and will also make it available as a voluntary notation for smaller vessels and vessels not in BV class. Getting the shaft/structure right is critical for modern designs and we have the deepest expertise in this area available anywhere. This notation helps to codify that and guide yards with new designs.”

For a graphic and photos to illustrate shaft alignment e mail john@merlinco.com

www.bureauveritas.com

www.veristar.com
 

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Container Ships

K Line to Expand Use of Eco-efficiency Software

Three further K Line vessels to install ClassNK-NAPA GREEN eco-efficiency software after reporting fuel savings during trials on an 8,600 TEU container vessel   NAPA

Even 'Small' Vessels are Getting Bigger

The Shipowners’ Club is a mutual provider of P&I insurance that has throughout its 160 year history been dedicated to serving owners of small and specialist ships.

Transpacific Container Shippers Plan Price Rise

A container shipping organisation urged companies on Wednesday to raise Asia-U.S. freight rates by at least $600 per 40-foot container (FEU) from Jan. 15, corresponding to an increase of 26.

Marine Power

Multraship Buys Three More Tugboats from Damen

Multraship and Damen Shipyards Group agreed on three new ASD (Azimuth Stern Drive) Tugs, all for delivery to Multraship in 2015. After delivery in Vietnam, scheduled

Waterjet-propelled Crewboat Delivered to Petrobras

BS Camburi, a 36-meter Monohull Crewboat built in Brazil by Arpoador Engenharia to the Petrobras type P2 specification has been launched and delivered.   Designed by Incat Crowther,

PIRIOU Delivers 53-meter FSIV

French boat builder PIRIOU has delivered the 11th of its 53- by 10-meter Fast Supply and Intervention Vessels (FSIV) to Suisse Outremer AG, to be operated by ABC Maritime AG.

LNG

Becker Marine Delivers Rudder for Largest Containership

Becker Marine Systems delivers rudder for the largest container ship in the world   At 19,000 TEU, the largest container ship in the world is now picking up speed

DSME Returns for More Dual-Fuel Engines

MAN Diesel & Turbo received an order for four MAN B&W 5G70ME-GI engines in connection with Daewoo Shipbuilding & Marine Engineering Co.,Ltd. (DSME) agreeing a deal

USCG Addresses Future of Marine Fuels

The future of marine fuels from the Liquefied Gas Carrier National Center of Expertise   The Pacific Merchant Shipping Association hosted The Future of Marine

Classification Societies

LR Supports Chinese Recycling Yards' EU Application

LR’s initial verification of the Ship Recycling Facility Plans for both Zhoushan Changhong International Ship Recycling Co. Ltd. and Jiangyin Xiagang Changjiang

NKCS Approves FROSIO Inspector Programs

ClassNK Consulting Service Co., Ltd. has announced the agreement concerning the Certifying Body of FROSIO, as an internationally recognized coating inspector’s qualification.

Maaskant Shipyards Earns ISO 9001:2008 Certificate

Maaskant Shipyards (Stellendam), part of Damen Shipyards Group, has received certification from Bureau Veritas for aligning its quality and management systems with

 
 
Maritime Contracts Naval Architecture Navigation Offshore Oil Pipelines Pod Propulsion Salvage Ship Electronics Ship Simulators Winch
rss | archive | history | articles | privacy | terms and conditions | 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: 0.1844 sec (5 req/sec)