Direct Comparison of Waterjets

Press Release
Thursday, March 07, 2013

Two recent refits of waterjets are unique in one respect that they allow a direct comparison between waterjet brands, while everything else remains unchanged.

 

Waterjets from Marine Jet Power were recently used to solve some significant propulsion issues and in one case the exchange even helped a yard to achieve its project goals leading to the fact that the yard finally was able to deliver the ships to the owners.
 

In the first case, the operator of a 10-year-old vessel decided to change to MJP DRB jets due to significant service and corrosion issues on the existing waterjets. The vessels were originally equipped with axial flow jets. MJP DRB mixed flow jets with intakes completely made of GRP were installed in one of the existing hulls with the rest of the equipment, including the engine, remaining unchanged. The GRP gives a smooth and efficient intake shape and eliminates any corrosion issues. The MJP DRB waterjets are otherwise completely made of stainless steel and have thus unmatched strength, resulting in a full five-year warranty, which per se is unique in the marine market.


Sea trial following the refit showed stunning results: Ship speed increased from 38 to 43 knots only thanks to the change of waterjets. The vessel with its original water jets never achieved more than 38 knots – not even when the ship was new. The overall efficiency has increased from 57% to 67%. The difference in efficiency is incredible 18%, meaning that the vessel can obtain an 18% lower fuel consumption. The engines can operate at lower load, giving less wear and longer service life.


Since the operator is very satisfied with both installation and function of the control system, more vessels are now being rebuilt accordingly.


In the second case a yard was in big trouble. Three brand-new vessels could not be delivered due to lack of performance. After long, it was decided to shift out the existing mixed flow jets to MJP DRB mixed flow jets on one of the vessels. Again, it was the MJP DRB jet with GRP intakes that were installed. Interestingly enough, when comparing the two jet systems on paper, they both claimed to deliver the same thrust. In reality, however, the MJP jets consumed 8,5% less power at the same operating speed. Power consumption was measured under the supervision of DNV, guaranteeing the accuracy of the measurements.


Furthermore, the noise level in the aft part of the passenger compartment was also measured. It turned out that the noise level was cut in half following the installation of the MJP DRB jets.


After the exchange of water jets, the yard could finally deliver the ships to the owner, who is now successfully operating the vessels.
 

MJP is said to have removed a big burden from the shipyard, while the operator is now counting on savings of approximately NOK 1.2 Mio per year when operating 3,500 hours annually.

Ivan Fossan, managing director of Norled comments: “Norled is very satisfied that Oma Baatbygeri AS has been able to find the reason why our new vessels didn’t reach the agreed speed. Oma Baatbyggeri builds high-speed vessels with an important comfort-factor and thanks to the MJP waterjets we do not only reach our desired speed, but save a substantial amount of fuel oil at the same time”.


In 2012 MJP Waterjets acquired Ultra Dynamics. The new group is named Marine Jet Power and has offices in Sweden, UK, US, Italy and Singapore as well as sales and service representatives in well over 30 countries. The company group product range comprises MJP CSU, DRB and Ultrajet series.
 

Maritime Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter April 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Offshore Casualty: Harkand Group Collapses

As the prolonged slump in energy prices continues to drag on a number of oil and gas and maritime players, word has it that Harkand Group has succumbed, according to staff reports and a report on www.

Louis Dreyfus, Amaggi Hire HSBC to Sell Terminal Stake

Agricultural commodity traders Louis Dreyfus Co B.V. and Amaggi Group have hired HSBC Holdings Plc to sell part or the entire 25 percent stake they hold in a terminal at the Brazilian port of Itaqui,

Shell Presents Crewmember Safety Awards

Shell Shipping and Maritime, Americas recently held its third annual Goal Zero Hero Awards dinner in Houston, recognizing the crewmembers of 21 contracted/chartered vessels,

Marine Propulsion

Alfa Laval HCO Filter Approved for Validation Testing

A manufacturer of two-stroke engines has agreed to validation tests of an Alfa Laval hydraulic control oil (HCO) filter . The approval to test the final HCO filter

GE Gas Turbines for Japan's New Warship

GE's Marine Solutions announced it will provide IHI, Tokyo, Japan, with two LM2500 aeroderivative marine gas turbines for the Japan Maritime Self Defense Force's (JMSDF) new 8,

WSS Offers ‘One Stop Shop’ Approach to Bunkering

Ship operators who rely on a myriad of companies for their global bunkering needs are wasting time, money and energy, with no guarantee of standardized quality of products and services,

Shipbuilding

Bollinger Wins Contract for Phase II FRC Builds

Louisiana shipbuilder Bollinger Shipyards announced it has secured a contract to build Phase II of the Sentinel Class Fast Response Cutters (FRC) for the United States Coast Guard (USCG).

Massive Layoff Ahead for Hyundai Heavy

Another massive reduction in the Korean shipbuilding workforce may come as most shipyards are still struggling with falling orders and mounting losses, reports Yonhap quoting industry sources.

Daewoo Shipyard Posts Q1 Operating Loss

South Korean shipbuilder Daewoo Shipbuilding & Marine Engineering Co. posted a first-quarter loss after incurring more costs to finish some offshore projects.   First-quarter

Ship Repair & Conversion

Great Lakes Shipyard Performs USCG Drydocking

On April 25, Great Lakes Shipyard hauled out the U.S. Coast Guard’s 125’ x 52’ Aids to Navigation Barge (12001). Using the Shipyard’s 770-ton Marine Travelift,

Sipu Muin Modernization Work to Begin in May

Canadian Coast Guard plans upgrades for Air Cushion Vehicle   A scheduled modernization of the Canadian Coast Guard CCGS Sipu Muin will see the Air Cushion Vehicle

Raytheon Anschütz Steering Gear Control for Luxury Cruise Ships

The German navigation system manufacturer Raytheon Anschütz was awarded a retrofit contract of steering gear control systems for two luxury cruise ships chartered by Noble Caledonia Ltd.

Environmental

DNV GL 7 JIPs in North America

In a concerted drive to find smart solutions to safely reduce complexities and cost in the North American oil and gas industry, DNV GL is leading seven new joint

Recent strength in dry bulk shipping to be short-lived - Drewry

Drewry forecasts dry bulk freight rates in 2016 will be, on average, lower than in 2015, as the medium-to-long term fundamentals for dry bulk shipping will remain challenging,

Dryad Maritime Unveil WxConnect

Today, 5th May 2016, Dryad Maritime release WxConnect, a new scalable, managed weather forecasting service for ships and fleets. The launch of the service comes

Fuels & Lubes

Gard Alert: Is Fuel in your Emergency Equipment Fit for Purpose?

Imagine the following scenario: It is in the middle of winter in the north Atlantic, freezing cold with rough seas, when an emergency onboard a tanker requires the crew to abandon the ship.

LUKOIL Marine Lubricants Launches Barge in Singapore

Experiencing continued success and growing demand for the supply of marine lubricants, LUKOIL Marine has launched an additional supply barge named LUKOIL Marine.

WSS Offers ‘One Stop Shop’ Approach to Bunkering

Ship operators who rely on a myriad of companies for their global bunkering needs are wasting time, money and energy, with no guarantee of standardized quality of products and services,

Marine Power

Alfa Laval HCO Filter Approved for Validation Testing

A manufacturer of two-stroke engines has agreed to validation tests of an Alfa Laval hydraulic control oil (HCO) filter . The approval to test the final HCO filter

Jensen Debuts New Tractor Tug Design

Crowley Maritime Corp.’s Seattle-based naval architecture and engineering firm, Jensen Maritime, reports it has designed a new tractor tug for Vessel Chartering

GE Equips New Multipurpose Supply Vessels

After equipping more than 20 purpose supply vessels (PSV)/multipurpose supply vessels (MPSV) for Eastern Shipbuilding, GE has once again been chosen by the builder

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Naval Architecture Navigation Salvage Ship Repair Shipbuilding / Vessel Construction Sonar Winch
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: 0.1263 sec (8 req/sec)