Lay-up of LNG & LPG Tankers

Gary Woolley Uncategorized 0 Comments

With the current covid situation globally we have seen a major drop off of LNG & LPG demand globally. At MLS we have received a number of enquiries and solutions both in Asia & Europe to Lay-up LNG & LPG Tankers

Where do tankers lay-up do not in service?

That’s a good question. There has been 2 traditional locations in Malaysia & Indonesia but the problem has been proximity of being close to a major trading hub and shipyard service for these larger vessels. At MLS we work with one location that also does LNG STS operations so is able to assist in cool down cargo to assist in re-entering service. As it is an operational port anchorage that also does lay-up so has a 2 level port security. It meets all the approval requirements of being near major trading hubs as it is very close to Singapore & Kuala Lumpur.

Tankers laid up

Gas Tanker Maintenance When Not In Service

The 2 options are to keep the vessel hot stacked  or to go full cold lay-up. Gas carriers have been going cold stacked for the last 40 years and have a proven cost benefit in this state.

Warm Lay-up

If going into hot stack some form of maintenance routines need to change when a vessel is not in full operation. Some software providers now have the possibility to switch ‘modes’ for maintenance activities based upon service of the vessel. This allows suppression and/or change in maintenance requirements based upon the actual needs of the vessel. Some form of maintenance review should be conducted when a vessel changes from an active mode to determine validity of the maintenance activities. This may allow in a reduction in operational cost.

Cold Layup

When a vessel goes into cold layup all the maintenance activities stop and a new set of maintenance activities is setup to verify the condition of the vessel. This is based upon verifying whether the equipment is not seized, not showing signs of corrosion in dehumidified areas, and taking tank sounding and electrical megger readings on a regular basis.

https://www.marinelayup.com/best-practices-for-marine-layup/

LNG & LPG Tanker Minimum Layup Location Requirements

As for lay-up location the basis factors still need to be considered.

https://www.marinelayup.com/choosing-layup-site

  • Approved by state or local authorities
  • Sheltered from open seas
  • With minimal tidal currents
  • A good holding ground for anchors
  • Outside of a typhoon/cyclone belt
  • Other factors to consider are
  • First of all close to major shipping routes?
  • Close to a major maritime hub for technical support?
  • Is it easy to access your vessel for inspections?
  • If I require a dry dock is there one close by?
  • Are there any security concerns?
  • Lastly how much will it cost?

 

At MLS we have a couple of locations in Asia, Europe, and the drier Middle East, with multiple berths that we use for lay-up of vessels both warm & cold stacked. They meet all the above points and offer the ability to reduce staff level below the minimum manning requirements. This would be based upon submission of a valid risk assessment to the authorities.

 

Contact us if you wish to know more how we can assist you navigate the options regarding Lay-up of LNG & LPG Tankers.

https://www.marinelayup.com/contact-us/

 

Lay-Up Passenger Ships

Gary Woolley Uncategorized 0 Comments

Lay-up Passenger Ships Current Situation

Passenger Ship Layup

With the current covid situation globally we have seen virtually all passenger ship activity stop globally. The only valid exception to this has been ferry services on a local or international coastal service. Where it depends on the interstate or inter country quarantine requirements put up by the authorities as this crisis has developed. This has meant there is an unprecedented need to lay-up passenger ships.

Where do passenger ships lay-up do not in service?

That’s a good question. Currently the industry is in crisis and they find themselves with no prior experience, history or knowledge on how to manage this crisis. Currently the welcome mat has been removed and in some countries and places find themselves not welcome. As such the options are to go alongside a wharf or go to anchor.  The anchorage option is more cost effective. At MLS we work with one location that is about to receive the first passenger ships in May 2020. It meets all the approval requirements, is close to Singapore & Kuala Lumpur, and has received approval for passenger ships to lay-up.

Passenger Ship Lay-Up Maintenance When Not In Service

As such the lessons that need to be learnt will come from lay-up knowledge gained initially from the oil crisis in the mid 1970’s, where machinery preservation and maintenance routines for vessels were first learnt. In the GFC crisis in the 2010’s more knowledge was gained on how to manage the vast amounts of electronic equipment that has made its way into vessels in the previous decades. When a lot of dynamically positioned (DP) vessels, that are electronic dependent, were reactivated to re-enter service after the GFC, reliability issues developed for vessels that were cold stacked. This is due to failure modes associated with electronic equipment. Lessons learnt from that period tend to indicate that the best practise is to keep some form of power to the electrical systems, even if not powered up, to increase overall long term reliability.

The model in the oil & gas industry for example would be to either raft rigs and back feed one warm stacked rig to 3 others at anchorage, or at a wharf to use shore power or rental generators to achieve the same goal with watchmen on board. Anchorages are cheaper option and of course wharves cost a lot more. Other astute operators did redundancy reviews and removed all electronic equipment as they decided by the time they came for their vessels the equipment would be obsolete anyway.

Overall some form of maintenance routines need to change when a vessel in not in full operation. Some software providers now have the possibility to switch ‘modes’ for maintenance activities based upon service of the vessel. This allows suppression and/or change in maintenance requirements based upon the actual needs of the vessel. Some form of maintenance review should be conducted when a vessel change from an active mode to determine validity of the maintenance activities. This will allow in a reduction in operational cost.

 

Passenger Ship Minimum Layup Location Requirements

 The following factors should be considered prior to choosing a final location.

  • Consider the minimum requirements are for the site are to be:
  • Approved by state or local authorities
  • Sheltered from open seas
  • With minimal tidal currents
  • A good holding ground for anchors
  • Outside of a typhoon/cyclone belt
  • Other factors to consider are
  • First of all close to major shipping routes?
  • Close to a major maritime hub for technical support?
  • Is it easy to access your vessel for inspections?
  • If I require a dry dock is there one close by?
  • Are there any security concerns?
  • Lastly how much will it cost?

 

At MLS we have a couple of locations in Asia, Europe, and the drier Middle East, with multiple berths that we use for lay-up of passenger ships both warm & cold stacked. They meet all the above points and offer the ability in the longer term to reduce staff level below the minimum manning requirements. This would be based upon submission of a valid risk assessment to the authorities.

 

Contact us if you wish to know more how we can assist you navigate the options that may face you!

 

other useful links

https://www.marinelayup.com/best-practices-for-marine-layup/

https://www.marinelayup.com/choosing-layup-site/

https://www.marinelayup.com/contact-us/

https://www.dnvgl.com/expert-story/maritime-impact/Key-factors-to-consider-when-assessing-lay-up-options.html

Failure Modes in Hot Warm & Cold Layups

Gary Woolley Best Practises 2 Comments
Layup in Bay of Brunei

Overview

I have been asked a few times what can fail in layup? Having been involved in layup since 2004 I decided to look into some of the common failures that can be expected during layup, for hot stacking, warm and  cold layup. It does not matter if you assets are located at a Singapore anchorage, Batam or in Labuan in the Bay of Brunei the following conditions could occur.

Layup in Bay of Brunei

Hot Layover & Warm Layup

General issues are found as crew are unaware of basic preservation techniques and leave systems in an as is condition. This causes corrosion issues, seizure issues and well as reduction in overall reliability of the equipment. With warm layup issues are pretty much the same as hot layup but as the time passes and no certainty of when the vessel will be reactivated the problems will start to manifest into bigger issues. Currently I have visited vessels sitting idle in the arrival condition 17 months later. Engines not turned properly, sea water systems left full of water on the expectation that tomorrow they may get the word to reactivate. Basically the planned maintenance system has not changed and if the equipment is not in use the maintenance is not completed. For this reason I have done a lot of work creating warm stacking maintenance variants as well as suppling basic preservation equipment. The below is indicative of problems that can be found but is not a complete list.

  1. Sea water systems shut down without proper basic preservation.
    • Sea water fouling of heat exchangers
    • Pipe corrosion due to localised corrosion
    • Stagnant water causing stainless fitting corrosion & Failure
  1. Treated fresh water systems shut down without proper positive pump circulation
    • Localised loss of corrosion inhibitor & therefore corrosion
  1. Fuel Systems left as per arrival without tank circulation
    • Stratification of IFO & HFO fuel systems
    • Microbial degradation of fuel left standing for a long time
    • Solidification of HFO
  1. Engine start systems
    • Malfunctioning regulators
    • Malfunctioning control systems
  1. Funnel Blanks not fitted and exhaust spaces not clean
    • Rain water entering economiser spaces and localised corrosion occurs
    • Hardening of soot and cannot be removed by soot blowing
  1. Jackup rig legs get stuck in the mud
    • Currently up to 4 day delays have occurred in Labuan due to this event
  1. Transformer oil contamination
    • Large transformers with coolant not fitted with a nitrogen blanket as part of a basic layup preservation

 

Cold Layup

Failures due to equipment deterioration in general. The atmosphere and especially the humidity may not have been monitored during lay-up, resulting in corrosion and deterioration.

 

  1. Electronic equipment start-up failures after months without power.
    • Electronic Failure
    • The equipment does not start when power turned on such as computers, servers, navigation systems etc.
  2. Control system calibration settings off specification
    • The hysteresis curve is out of specification and locks out the system from starting such as DP control systems, boiler combustion systems, other computer or PLC control systems.
  3. High moisture levels in electrical/ electronic components
    • All products & components both electrical & electronic has operating specifications which generally specify a temperature & humidity range. An enclosed space with no dehumidification will increase the humidity to in excess of most rated devices and can/ will lead to deterioration and component failure. Layup with VCI spray only will cause issues.
  4. Batteries
    • Different battery types have different requirements and it does pay to check type and see advice from the manufacturer
  5. Hull fouling
    • Sea chest fouling reducing water flow, Growth build up in tropical waters is fast
    • Growth around stern tube seals
  6. Impressed current system turned off
    • Corrosion in sea chests
    • Hull corrosion, subject to paint condition
  7. Ships side valve seizing in the closed position
    • Unfortunate but true even with proper layup greasing prior to shutting
  8. Corrosion & failure of pressurised sea water pipes or pipes passing through ballast tanks
    • Live sea water pipes will always pose an issue and unless drained and dehumidified cannot be actively controlled. Preservation VCI products may assist with this issue but unless opened and condition assessed it cannot be guaranteed
  9. Machinery sitting static for long periods or turned with improper lubrication
    • Pedestal bearings without forced lubrication are on to watch out for.
  10. Dry powder extinguishers
    • Compacting of powder due to not being turned upside down monthly

The Solution

The above is only part of the problem with incorrect layups. As part of the solution MLS is able to provide a reactivation schedule in advance if required so that parts can be identified as being required for reactivation, estimation of pipe spool replacement time and system readiness. This is to ensure that consumables, materials & specialised labour can be identified in advance and time to reactivate better judged. The reactivation schedule should be completed within 1 month of vessel being declared laid up. So whether you’re sitting in Singapore Anchorage, Bay of Brunei or elsewhere in SE Asia MLS can provide you with a consultancy service to that suits your needs & budget

Corrosion Control During Layup

Gary Woolley Best Practises 0 Comments
ship rig corrosion control

Corrosion Control & Environment

Whether you are looking to layup in Batam or as far as layup in Labuan an understanding of the environmental factors that are in play in Asia is important to drive the correct layup solution that is most effective for your assets.

Most companies are trying to balance cost efficiency with layup effectiveness with differing results. Many layup operators have entered the market following the ongoing downturn and may not be giving the best solution for you but what is best for them. As such consider the following.

Read more “Corrosion Control During Layup”

Best Practice Marine Layup

Gary Woolley Best Practises 0 Comments

Are humidifiers necessary?

During a recent consultation visit to inspect a couple of rigs for layup in Labuan, in the Bay of Brunei there was a lot of discussion on the importance of dehumidifiers and whether they are necessary at all.

The below information serves to highlight the 3 main class recommendations for layup and should speak for itself as whether in Asia you can afford not to use dehumidifiers. Some rig & vessel owners are tending not to use dehumidifiers due to perceived cost or instead use VCI (Vapour Corrosion Inhibitor) products as a substitute to dehumidifiers. The importance of following proper layup procedures cannot be underestimated. The humidity levels in Asia means that corrosion is accelerated if moisture is not controlled. As such dehumidifiers are of great importance for  layup in Labuan and areas surrounding the Bay of Brunei.

Read more “Best Practice Marine Layup”