Flexible mobdock repair method for underwater shaft seal repairs developed by Hydrex

Diver/technician re-welding the rope guard after shaft seal replacement
Diver/technician re-welding the rope guard after shaft seal replacement

Hydrex has developed a flexible mobdock repair method that enables the underwater replacement of all types and sizes of shaft seals. This technology has been successfully used by Hydrex diver/technicians for over a decade. It allows ship owners to keep their vessel sailing, saving precious time and money.

Damaged stern tube seals will cause an increasing amount of oil leaking or water ingress as the damage worsens. By replacing the seals when the damage is first discovered, Hydrex keeps the down time low. The ship can keep its schedule as seal repairs can be performed during cargo operations. This is done by creating a dry underwater working environment around the shaft.

It is not always straightforward to replace seals, because there can be quite a bit of variation in the configurations of the stern tube itself. There can also be complications with the liners, which can be worn down and show ruts. All this is routinely handled by Hydrex teams on the jobs.

In this article you can find a short summary of some of the recent Continue reading “Flexible mobdock repair method for underwater shaft seal repairs developed by Hydrex”

Chairman of IACS satisfied with association’s achievements, emphasises the importance of being agile

Mr Ørbeck-Nilssen said that over the past year great progress had been made in modernising classification to deal with the digital transformation of shipping
Mr Ørbeck-Nilssen said that over the past year great progress had been made in modernising classification to deal with the digital transformation of shipping

Speaking at the Posidonia trade fair in Athens, Knut Ørbeck-Nilssen, who will hand over the reins of IACS in July, examined how the association had evolved during his time as Chairman.

In an industry undergoing rapid change, the IACS Chairman identified the need for classification societies and IACS itself to be adaptable and prepared for change, while staying true to the core purpose of classification.

Mr Ørbeck-Nilssen said that over the past year great progress had been made in modernising classification to deal with the digital transformation of shipping: “I’m pleased to see the progress that was made in modernising the concept of class, to adapt to the digital transformation we see in shipping today. I say transformation because the progress has truly been astonishing. IACS has embraced the challenges and changes ahead, to support the industry – contributing to the development of a safer and more secure Continue reading “Chairman of IACS satisfied with association’s achievements, emphasises the importance of being agile”

Green light to adopt Methanol given as a sustainable marine fuel

Topic areas of the project’s final reports include the technical feasibility of converting vessels to propulsion using Methanol
Topic areas of the project’s final reports include the technical feasibility of converting vessels to propulsion using Methanol

The Methanol Institute has welcomed the findings of the Sustainable Marine Methanol (SUMMETH) project, which has backed the increased use of Methanol as a marine fuel.

The research concluded that there are no obstacles to the efficient use of Methanol in a converted diesel engine and that smaller vessel conversion projects are feasible and cost-effective, with levels of safety that easily meet existing requirements.

Switching to Methanol would offer immediate environmental benefits, including close to zero SOx and particulate matter emissions and significantly lower NOx emissions compared to conventional marine fuels or biodiesel.

Continue reading “Green light to adopt Methanol given as a sustainable marine fuel”

Netherlands to impose degassing ban on inland navigation vessels

This ban aims to make the air quality around shipping routes better.
This ban aims to make the air quality around shipping routes better.

The Netherlands will impose a nationwide degasification ban for inland navigation vessels. The Minister of Infrastructure and Water Management, Van Nieuwenhuizen, wants the degasification ban to be introduced in the Netherlands by mid-2020.

This ban aims to make the air quality around shipping routes better. Inland shipping vessels often leave harmful emissions in the open air while sailing. The degassing ban must provide about 95% less emissions of harmful volatile substances by 2023.

A taskforce will be created in order to ensure along with the business community that the introduction of this national degassing ban runs Continue reading “Netherlands to impose degassing ban on inland navigation vessels”

Stainless steel bolts at offshore facility fail due to corrosion cracking

A number of strain-hardened, Type 304 stainless steel bolts, (ASTM A193 B8, Class 2) failed unexpectedly at an offshore facility
A number of strain-hardened, Type 304 stainless steel bolts, (ASTM A193 B8, Class 2) failed unexpectedly at an offshore facility

The International Association of Oil & Gas Producers (IOGP) published an alert regarding an unexpected failure of certain kinds of strain-hardened Type 304 stainless steel bolts. The failure happened at an offshore facility during a pneumatic leak test of gas piping exiting a test separator.

The incident
A number of strain-hardened, Type 304 stainless steel bolts, (ASTM A193 B8, Class 2) failed unexpectedly at an offshore facility while a pneumatic leak test of gas piping exiting a test separator was being conducted.

Strain-hardening austenitic stainless steel nuts and bolts to increase their strength may increase their sensitivity to chloride-induced stress corrosion cracking (CISCC) and reduce their safe upper temperature limit. Other factors such as Continue reading “Stainless steel bolts at offshore facility fail due to corrosion cracking”

Recent marine bollard failures give USCG cause for concern

There have been a number of shore side marine bollard failures whereby moored vessels were cast adrift
There have been a number of shore side marine bollard failures whereby moored vessels were cast adrift

The USCG issued an alert informing that recently, there have been a number of shore side marine bollard failures whereby moored vessels were cast adrift. In some cases, this resulted in damage to the involved vessel, as well as other nearby vessels and shore side structures, the USCG warned.

Neither the USCG nor the Occupational Safety and Health Administration (OSHA) has regulatory oversight over these items. In several cases, the underlying deficient material condition of the bollards was unknown until the failures occurred.

Key causes include:
– the rotting of organic bollards made of marine pilings,
– the undetected fracture of bollard castings due to manufacturer defects,
damage from previous overloads, or
– the degradation of bollard foundations and fasteners.

Typically, the failures are associated with abnormal dynamic loads transferred to the bollard from a vessel. The abnormal loads are oftentimes caused by Continue reading “Recent marine bollard failures give USCG cause for concern”

Ethylene vapors activate carbon monoxide alarm says safety alert

A certified marine chemist traced the source of the vapors to an eight inch crack on a cargo vapor line
A certified marine chemist traced the source of the vapors to an eight inch crack on a cargo vapor line

The USCG has published a safety alert informing marine inspectors that ethylene vapors on LNG carriers can activate Carbon Monoxide alarms. Specifically, during an examination of a LNG carrier whose cargo tanks contained ethylene vapors, PSC Officers (PSCOs) received alarms on their portable four gas meters giving a reading of 60 to 100 parts per-million (PPM) Carbon Monoxide (CO).

A certified marine chemist traced the source of the vapors to an eight inch crack on a cargo vapor line. PSCOs initially thought the alarm was related to a combustion event and did not suspect the ethylene vapors were the source, because they did not get a Lower Explosive Limit (LEL) reading on their monitors.

The chemist indicated that the LEL most likely never alarmed because of high winds on deck. He further explained that the molecular weight of Ethylene (28 g/mol) was identical to the molecular weight of CO which accounted for the CO PPM readings. USCG personnel contacted the manufacturer who confirmed that Continue reading “Ethylene vapors activate carbon monoxide alarm says safety alert”

Sinking raises safety issues on bilge alarms

The failure of engine cooling system pipework is one of the most common causes of flooding on small fishing vessels
The failure of engine cooling system pipework is one of the most common causes of flooding on small fishing vessels

In its latest Safety Digest, the UK MAIB provides learnings about an 8.13m fibreglass fishing vessel that was engaged in picking up its fleets of creels when it began to take on water and subsequently sank. The skipper, who was working alone, managed to deploy the boat’s liferaft and climb into it as the boat was sinking and was later rescued without injuries.

The incident
The skipper went out to sea shortly after daybreak to recover his two fleets of creels. The weather was good. As soon as he arrived at the fishing grounds, he hauled in the first fleet of creels and stowed it on the aft end of the deck. He then headed at speed toward the second fleet of creels.

Continue reading “Sinking raises safety issues on bilge alarms”

INTERCARGO Bulk Carrier Casualty report published

INTERCARGO has published its Bulk Carrier Casualty report that analyses bulk carrier casualties over the period from 2008 to 2017
INTERCARGO has published its Bulk Carrier Casualty report that analyses bulk carrier casualties over the period from 2008 to 2017

INTERCARGO has published its Bulk Carrier Casualty report that analyses bulk carrier casualties over the period from 2008 to 2017. The report revealed that 53 bulk carriers over 10,000 dwt have been identified as total losses over that period with cargo shift and liquefaction remaining a great concern.

In 2017, the tragic losses of ‘Stellar Daisy’ carrying an iron ore cargo and ‘Emerald Star’ with a nickel ore cargo raised questions of structural integrity and safety condition of high density cargoes carried onboard. These two bulk carrier casualties caused the loss of 32 seafarers, the highest annual loss of lives since 2011.

As the report reveals, 9 casualties of suspected cargo failure consisted of 6 bulk carriers carrying nickel ore from Indonesia, 2 vessels with Continue reading “INTERCARGO Bulk Carrier Casualty report published”

Are ‘Smart Bolts’ the thing of the future?

Intelligent wireless bolts in wind turbines or satellites may be able to let the operator know when something is wrong
Intelligent wireless bolts in wind turbines or satellites may be able to let the operator know when something is wrong

In the future, intelligent wireless bolts in wind turbines or satellites may be able to let the operator know when something is wrong. This could reduce the risk of human injuries and save cost.

A research team at NTNU in Gjøvik is working to create bolts that send an alert when something is not as it should be or when maintenance is needed. Each bolt must be able to contact a control center, which will receive messages from all intelligent bolts of this type in all installations around the world.

The team working on these wireless bolts includes Professor Michael Cheffena, two fellows and the manufacturer Dokka Fasteners. The vision of the research team is to develop wireless sensors to be installed inside the bolts. If the sensors detect that something is Continue reading “Are ‘Smart Bolts’ the thing of the future?”

IACS publishes its 2017 Annual Review

Knut Orbeck-Nilssen IACS Chairman
Knut Orbeck-Nilssen IACS Chairman

Quality, modernisation and transparency have been the three fundamental themes of the International Association of Classification Societies (IACS) during DNV GL’s Chairmanship, and this approach is widely reflected in IACS’ 2017 Annual Review which was presented in London by IACS Chairman Knut Ørbeck-Nilssen.

Looking back at IACS’ development and successes over the past year, Mr Ørbeck-Nilssen said that during these dynamic times, both IACS and it’s twelve Member societies need to act as a guide for the shipping industry, identifying the path for others to follow.

Continue reading “IACS publishes its 2017 Annual Review”

DNV GL publishes its review of marine fuel alternatives

Image courtesy of DNV GL
Image courtesy of DNV GL

Class society DNV GL has published an up-to-date assessment of the most promising alternative marine fuels available today. The study is timely, as the 2020 fuel sulfur cap is fast approaching and the IMO has just decided to aim for a 50 percent cut in shipping’s carbon emissions.

The paper examines the prospects for the full range of alternatives – LNG, LPG, methanol, biofuel, hydrogen, fuel cells, wind and battery technologies – and it compares them to the use of conventional fuel, both Continue reading “DNV GL publishes its review of marine fuel alternatives”

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