CJC™ Oil Maintenance for Laid-up vessels
Solutions for removal of particles, water, acidity and oil degradation products from oils & diesel fuels
How to avoid «3-week-crisis» after recommissioning
Challenges for laid-up vessels
Oil maintenance for laid-up vessels
When vessels are taking out of operation and laid-up, the on-board equipment will experience situations they were not designed for. It is important to know the risks in this lay-up period, and what can be done to avoid oil systems problems when starting up the equipment again.
We’ve created this guide as a reminiscent of the challenges arising during cold and hot lay-up, providing some tips for maintenance as well as steps to do before re-commissioning. These im-portant steps are to avoid huge costs in connection with later stops or equipment breakdowns.
The main challenge with laid-up vessels is related to water content in oil, which
increases or change state/character. This can lead to severe damage when machinery and equipment are to be re-started.
Hot lay-up challenges
Some machines are kept in operation, but a substantial part of the vessels equipment is not used.
It is this equipment that we need to be particularly aware of.
To avoid the challenges during hot lay-up we recommend continuous oil filtration and water removal. If this is
not done, and the lay-up period is longer than 14 days, it is very important that the oil is filtered thoroughly
before commissioning, in order to remove particles and water. For short lay-ups (under 2 months) you must be
particular conscious and ensure thorough oil filtration and water separation before running the oil systems again.
Hot lay-up vessels
|Thruster lube oil||Thrusters are not running. Alternatively test run occasionally||Condensation, water, oxidation, bacteria, particles (by occasional test drive)||Corrosion, increased risk of extreme wear or breakdown on gear drive|
|Engine lube oil||Engine is operating roughly as normal||Ensure completion of ordinary routines and run oil filters/separators||None as a result of lay-up as long as normalmaintenance is performed|
|Diesel fuel||Engine is operating roughly as normal||Ensure completion of ordinary routines and run oil filters/separators||None as a result of lay-up as long as normal maintenance is performed|
|Hydraulics||Hydraulic equipment is not in use||Condensation, water, bacteria, oxidation, particles||Corrosion/rust, increased risk of extreme wear/breakdown of equipment when re-started. Varnish locking valve spools in place|
Cold lay-up challenges
Electrically dead with no operating machineries. A situation which equipment is not designed for.
To avoid these challenges from the cold lay-up we recommend to run oil filtration and
water separation monthly or at least with an interval of maximum two month. It is very
important that this is done to avoid wear and breakdowns of machinery when they are
started up again.
Cold lay-up vessels
|Thruster lube oil||Thrusters are not in operation.||Condensation, water, oxidation,
|Corrosion, increased risk of extreme wear or
breakdown on gear during re-commissioning.
Additives precipitate out of oil.
|Engine lube oil||Engines are stopped||Oxidation and bacteria.||Corrosion and varnish. Oil additive depletion|
|Diesel fuel||No diesel is circulated or
|Condensation, water, bacteria.||Increased risk of extreme wear or breakdown
on fuel system/engine during re-commissioning.
Needle valve in injectors can seize by rust/particles.
|Hydraulics||Hydraulic equipment is
|Condensation, water, oxidation, bacteria,
particles (by occasional test drive).
|Corrosion, increased risk of extreme wear or
breakdown of equipment. Valve spools locked by
varnish. Oil additive depletion.
Why oil maintenance?
Many shipping companies have had very unfortunate experiences and extraordinary expenses when laid-up vessels are put back in operation.
In a few cases, the problems occur immediately, but most often the failure manifest themselves when the equipment has been in operation for 2-3 weeks.
These steps can help you to reduce the risk of surprises
- Filter the oil and remove water, and ensure the oil is dry and warm before startup.
- After prolonged lay-up, all machines will release more particles than normally seen during commissioning. It is therefore important to have continuous oil filtration to catch up.
- Take oil samples and analyse the oil. After prolonged cold lay-up (more than 12 months) oil samples should be analysed and verified, before taking the equipment in operation, since water and wear particles will increase oxidation as well as pull additives out of the oil.
- Max 300 ppm water in hydraulic and gear oils. Check demulsibility too – max 4 ml emulsions.
- Max 200 ppm water in diesel. Check for microbes/diesel pest
- Max 2,000 ppm water in engine lube oil
Broken components due to water contamination in oil systems
Machinery without oil filtration
- Install a CJC™ Oil Filter solution, and get support from our skilled service
technicians for optimum result and oil cleanliness.
- Connect the oil filter unit to the oil system. Handle all mechanical aspects
through the job.
- Filter the oil system before and after machinery is started, removing
water and particles.
- Take out oil samples and document oil cleanliness using on site analysis
as well as laboratory reports.