New GL Guidelines for Complex Data Networks
Friday, July 12, 2013

Germanischer Lloyd (GL) has published new guidelines for data networks which are implemented onboard ships or offshore platforms.

As the maritime industry makes greater use of automated systems data networks have become more and more complex, while also integrating safety-critical and non-safety-critical application systems. The guidelines are available for download now on the GL website and will enter into force on August 1, 2013.

One of the main reasons for the increasing number of application systems which are connected through data networks is to minimize the total length of cabling installed throughout the vessel. Minimizing cable length not only reduces the material and installation costs for the cabling, but also avoids adding unnecessarily to the overall weight of the ship or the platform. This is especially relevant in cruise vessels, where the delivery of high quality interactive entertainment services to passengers is increasingly important.

In merchant shipping too, however, more and more vessels are equipped with integrated bridges that link information from the navigation and automation systems. Today, as well, modern automation systems are themselves complex integrated systems that comprise several monitoring sensors, control systems for the propulsion and power-generating systems and monitoring and alarm systems.

A type approval would be required for data networks which connect application systems related to classification such as: automation system, navigation system, alarm and monitoring system, general alarm and public address system, comprising all the necessary for monitoring, control and safety including in- and output devices. Non-class related application systems would include entertainment systems such as: radio, television, audio and video on demand and private internet access. The required approval would cover the entire network, including routers, switches, and process controllers connected with network cables.

In order to follow a systematic and reproducible risk-based approach for the approval process, a so-called Requirement Class is assigned to the respective data network. The scope of documents to be submitted for approval and the required function tests depend on this assignment.

There are five different Requirement Classes, differentiating the individual network according to the magnitude of the damage which would result from a potential component or system failure and its effect on the persons onboard, the environment and the technical condition of the vessel. This approach follows the same procedure as the approval process for computer systems under GL's Rules and Guidelines.

The Guidelines can be found on the GL website here:


Maritime Reporter September 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

Creole Spirit Sets Sail for Sea Trials

Teekay’s first M-type, Electronically Controlled, Gas Injection (MEGI)-powered LNG vessel, Creole Spirit, has sailed out from the Daewoo Shipbuilding & Marine Engineering

Chevron Cylinder Oil Gains NOL from Wärtsilä

Chevron Marine Lubricants’ 100BN cylinder oil, Taro Special HT 100 has received approval for its use in another engine range – products made by Winterthur Gas & Diesel Ltd.

Volvo Penta Doubles Service Interval

Volvo Penta today announced a new extended service interval for its commercial marine diesel engines.   Under the new program, owners can double the maximum oil change interval to 1,


US Senators Introduce Bill to Limit Offshore Drilling

A group of U.S. Senators on the West Coast have introduced a bill Wednesday aiming to prohibit offshore drilling on the outer continental shelf of California, Oregon and Washington.

Danish-South Korean Co-operation Strengthened

The Danish-South Korean Green Growth Alliance met for roundtable talks yesterday. The Minister for Business and Growth's meeting with the South Korean Minister

Seadrill Hopes to See Market Turn in 2017

Offshore rig driller Seadrill is facing another two years in the doldrums but hopes the international rig market could turn around in 2017.   Rig rates have more


HMS Protector Deployed to Antarctic

Ice ship HMS Protector is heading for waters no Royal Navy vessel has visited in 80 years as she begins a marathon deployment to Antarctica. The Plymouth-based

Moody Upgrades Port of Palm Beach

The Port of Palm Beach District announced that Moody’s Investors Service, Inc. upgraded the Port of Palm Beach District senior rating to Baa3 from Ba1, and reported the outlook to be stable.

Newport News Shipbuilding Converts to Natural Gas

Huntington Ingalls Industries (HII) announced today that its Newport News Shipbuilding division has converted its steam-generation plant from heavy fuel oil, also known as Bunker C,

Classification Societies

ClassNK Begins Testing CBM System

ClassNK has commenced verification tests of its next-generation condition-based monitoring (CBM) system ClassNK CMAXS e-GICSX for Mitsui’s MAN B&W engines. The

Two RAscal 1500 Tugs Delivered

Sanmar Shipyard of Turkey has recently completed two RAscal 1500 tugs for Jordanian owners. The tugs are now delivering marine services to the FSRU berthing

New Class Rules Favor Seawater Lubricated Props

Classification societies are changing their monitoring rules for seawater-lubricated propeller shafts in line with the rules governing the inspection and withdrawal

Maritime Contracts Maritime Security Maritime Standards Offshore Oil Pipelines Pod Propulsion Port Authority Ship Electronics Shipbuilding / Vessel Construction 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: 0.1351 sec (7 req/sec)