Saturday 6 October 2012

Logic Behind Tank Cleaning

One of the most over-rated and mystery shrouded activities on board a tanker, product, crude or chemical, is tank cleaning. And now we have supercargoes who are making money by putting in expertise of all kinds in this field, when all that they do is simple logic.

Another field that is making a lot of money in this is the Tank cleaning chemicals manufacturers, who have over-rated a simple tank cleaning also to heights, where every tank cleaning will require use of their chemicals.

I've sailed on all the three types, been a 46 months Chief Mate, apart from all the other ranks, upto Master, and trust me, I've mostly avoided a tank cleaning chemical, even to prepare the vessel for a wall wash cargo spec, for Rohm & Haas as the cargo suppliers. And never once did i have tanks failing either.

So what did I do  differently?

Use logic and trial method!

How? Very simple. Understand simple reasoning, the environment, the exposure and the result.

To elaborate, let's take a simple example.

Epoxy coated tanks. Cleaning to be done.
Environment : Sea water temperature, air temperature, gases in the tank, humidity, tank coating.

Exposure : cargo physical and chemical properties, in direct context of the last cargo, upto the 10th last cargo, the next cargo and the tank coating.

Result : Water White or Wall wash, specs differ.

So how do coated tanks make any difference ?
Coated tanks - this is paint. Paint requires a solvent and a binder. These in the simplest layman term are what constitutes the binding property and are more often organic in nature. Else, the paint would not dry up. That implies there is something in paint that can evaporate, leaving a dry film behind. What all causes evaportation? Temperature and the ability of the solvent to evaporate.

So what happens. A cargo is loaded, if it is solvent based or solvent type of cargo, or a Hydrocarbon rich cargo, it will always be absorbed in the coating.
What would tank cleaning chemicals do in such case? They soften the coating, open the pores and remove the absorbed last cargoes.
So, is their any other way to do same, without a chemical. Yes, raise the tank temperature. You could do live steaming (beware of LEL, if a constraint) or you could run steam through the heating coils (or thermal oil, as applicable) at minimum pressure. This will raise the tank temperature. However, doing steaming is the better solution, as it does three things -

1) It raises the tank temperature, thus releasing absorbed cargo or HC.
2) It is mostly pure water, next best to DI water, so you do not need too much Fresh water wash.
3) IT removes odour of last cargoes.

An ideal tank cleaning, when chemicals are not used is as follows :
1) Check for drying or non-drying oil and accordingly decide on a pre-wash, and SW temp as required. Wash the tank for 30 min immediately or soonest after discharge, if drying or semi-drying.
2) Ambient Sea Water. Ambient is the temperature, at which you get it. Now in winters, in North Sea you would not get water at 20 Deg C. And anything less is not helping. So heat the water to about 30-35DegC, or at least 10-15DegC above the melting point or pour point of the cargo.
What this will do, is it will only work as a force to push through the remnants of the cargo, which mostly, I assume is insoluble in water. So, basically, the cargo ROB, is pushed with water force, down through the tank bulkheads and then through the pipelines, out. If the cargo is not a heated cargo, and the cleaning specifications are not big, the process ends here. Purge and / or gas-free. Mop, may require some local cleaning and removal of collected water.

3) Hot Sea Water. If the cargo is a heated cargo, rest assured, your attempt at using ambient Sea Water or warm water has not made much of effect to the process. There is a lot of solidified clingage on the bulkheads. In such case, this is the largest part of cleaning using machines. 3 hours to 4 hours. Use hot water, the more you use, the more machines you use, including portable, the more helpful it is. And sea water is plentiful in supply. Don't worry about slops either, if the cargo is Annex-I. first, its the result that matters, as to how much you need to clean, and you can mostly always decant it. The ROB oil will not increase just because you used more water.
Hot water does the heating the tank part too. So, you can be assured that it is taking care of a lot of absorbed cargo too. Don't worry for chlorides at this stage. Sea water has roughly 19000 ppm of chlorides. Whether you use, 10 ltrs or 1000 m3, it will not change. Hot water helps in evaportation too. Make sure you manage the tank atmosphere, if required, controlling rising LEL or HC concentration.

4) Fresh water rinsing. Yes. do no more then mere rinsing. Normal FW supplied to the ships is at about 200 ppm Chlorides. So, use it only as much, so that you could bring down the Chlorides, accumulated during Sea water wash, from 19000ppm to 200 ppm. And, after doing hot sea water, you can only make one error more. Use ambient or cold Fresh water. If you use FW rinsing at the same or similar temperature as the Sea water wash in the last stage, you'll possibly need 10m3 in each tank for bringing down chlorides to 200ppm. If you use cold, you'll possibly need 30m3.

5) Now the interesting part. Your tank is mostly ready. If you're loading wall wash cargo, carry out live steaming of tank (make sure the tank is gas-free) and don't even think of using any solvents or chemicals (they are mostly banned for a reason). Do the live steaming for about 2 hours. Around this time, also do live steaming of all pipelines and pumps too. Let condensed water accumulate in the tank. Keep stripping out once in a while, if you wish. But if you leave it there, it is no harm either. This would, in an ideal case, bring down your Chloride ppm to less than 10. If need be, do another 1 hour (depends on tank size).
Now the important thing. You need to let the tank cool down. Gas free, enter, strip, mop, dry. Once dried, check wall wash sample. If the result is bad or the required spec is not met, give a DI water rinse. No more hot water, or steaming, once the tank has cooled down.

You'll find that once the tank has cooled down and dry, the wall wash will show excellent result. No HC, close to 0 Chlorides. Why? Because the coating has now stopped releasing anymore absorbed cargo.

Here, it is important to point out that sometimes tank cleaning chemicals are necessary -
1) In case of stains - use Bleach
2) In case of rust - use rust remover
3) In case of crude palm stearin carried at 65DegC, an alkaline cleaner.
4) In case, the last few tank cleanings have been a hog wash only, then possibly a HC remover too, if any of the last 10 cargoes has been HC rich.
5) Oh and yes, if odour is so much an issue and you can't live with it, then a deodorizer.
6) Special cargoes (chemicals like TDI, MDI) require a prewash by chemicals, as this is reactive to water.

And most of these chemicals are to be used in Fresh water at a high temp about 60-65DegC or sometimes even higher.When you take bath and use soap, the soap does not leave your body easily, if the water you are bathing with is cold, or putting it other way round, it leaves faster, when the water is warm or hot.

LOGIC : try cleaning utensils at home, or cleaning the floor, our Indian housewives are better cleaning expert then all of these super cargoes put together. Highly under-rated, house wives, who are actually not working mothers, wives, are more practical and logical thinkers and with common sense, more than the working ones.

CAREFUL, LOGICAL AND COMMON SENSE. Think in the box sometimes. What would actually be happening. If you cannot, just make a container, painted with the same tank coating, fill it up with cargo, leave it for few hours. Then try cleaning it. Trust me, you'll be happy to think, you can do it too!

The grand truth of


In the last 2 years, I've tried to raise an issue, sometimes single handedly and sometimes with some support. However, it came with a price tag. Of being misunderstood, of being questioned to the level of my integrity and purpose behind doing what I thought could be my meagre contribution to the cause.
I'm unsure, as to how much I could actually achieve however, am pretty sure of what all I've lost in bargain. The most that I've lost is my ability to merge in the crowd. Supporting a cause or fighting for a cause, you start portraying a picture that is larger than life, where people look at you in suspicion at times, and with awe at times, but never actually considering that you too are similar to them.

Finally, I realized that changes do not come, unless the people for whom you are fighting for, should take the fight on their own shoulders. But then everyone looks forward to a leader. We all become accidental heroes, but no one wishes to be a hero for himself or herself, which is the greatest pity I found in today's generation.

What do I wish to achieve, is the most prominently asked question. And I'm unable to answer it, because the suspicious minds around only look at the hidden agenda behind, and self-less acts are not welcome anymore.

What I was doing, or tried to do, was not self less. Everything I do, is for myself, because that's what I believe in, even loving my family for that matter. But the bigger than life image which came in the bargain, got me only discomfort and misunderstandings. What I tried to do, was only because I could not be a person, who could sit and see something happening, and do nothing. I tried and I failed. And the hard fact is that in the end, I managed to loose my identity for getting portrayed as someone bigger, which unfortunately I'm not.

Eventually, I had to decide to let go, because in the bargain, I had started loosing friends, who for their own reasons, started staying aloof, people that I respect started misunderstanding and worst, I was unable to give due time to my family.

I would not like to think of myself as a failure, as I'm, but, only a normal human being, and what i tried to do, pushed me levels higher, for which I'm not big enough, at least professionally, or to be able to actually do anything, but to look forward and appeal to the people, who could make things happen. Hopefully, someday, I will, but until then, I'd love to lead a normal life, back in the crowds, and not like a celebrity, because being cast out from the crowd, is not a pleasant feeling.

So, adios and apologies to all those, who understood the context of what I'm talking of, but unfortunately, I'm not willing to loose more.

Tuesday 26 June 2012

DPP to CPP Tank Cleaning

TANK CLEANING FROM DIRTY PETROLEUM PRODUCTS TO CLEAN PETROLEUM PRODUCTS

Carry out following steps:

  1. Butterworth for 2-3 hours with sea water close to and max. temp 50 DegC (Not more). Do not wash with hot temperature because product can change characteristic.(High boiling residues)
  2. Butterworth for 2 hours with sea water close to 60 to 70 DegC in second time.
  3. Create a mixture (5%) of a chemical such as Superdegreaser in a slop tank, keep water mixture temp around 80 DegC and use this water for recirculation inside the cargo tanks. Each tank recirculation for about 2 hours. You may need to change this / create new solution, when the water inside slop tank becomes very black.
  4. Butterworth for 1-2 hours with hot (80DegC) sea water.
  5. Check the tank for sludge. If sludge is present, you may need to vent and gas-free and then manually demuck the cargo tank, prior giving another 1 hour of hot sea water wash.
  6. Rinse with Fresh water for 30 minutes at ambient temperature.
  7. Vent / mop / dry and demuck as required. Basis the quantity of sludge remnant in the tank, you may have to do some part of tank cleaning again.
Another option is to carry out the re-circulation process using Gas-oil, however, this could be very dangerous as the flammability is unknown and slightest error or source of ignition can cause a problem. In this case, all free-water must be removed prior re-circulating Gas Oil and also tank must be inerted to <5% Oxygen.


CP-Superdegreaser (CTC)


Characteristics & applications 

  • Emulsifying agent based on aromatic solvents
  • Contains anionic and non-ionic surface agent
  • Specific solvent with high boiling and flash point
  • Ideally suitable for the removal of crude oil, bitumen, paraffin and other high melting point stains
  • Can be used undiluted up to 65°C
  • Safe for use on epoxy, polyurethane, zinc-silicate coatings and stainless steel.
Properties
Basic components: Aromatic & aliphatic solvents, emulsifiers, anionic and non-ionic surface active agents 
Characteristic
PH 1%:7.0
Phys. properties :light amber liquid
Spec. gravity:0.90
Flashpoint :65°C - 10% solution in water 95°C
Solubility in H2O :emulsifying with water

Application for use: 

Concentration :2-10% recirculation or direct manual spraying
Temperature:cold - 95°C

Afterwards rinse thoroughly with fresh water.
Safety Aspects 
  • avoid contact with eyes and skin
  • in case of irritation rinse with plenty of water
Wastewater 
  • Dispose according to regulation.
  • Persistention: product is fully biodegradable



CARECLEAN DEGREASER (By Marine Care)
HEAVY DUTY SPLIT
A cleaning agent with excellent separating properties for the removal of mineral oils and
similar residual sediments.

  • Suitable for removal of mineral oils.
  • Strong emulsifying cleaning agent.
  • Suitable for cleaning of engine rooms.
  • safe on most common metals and polyurethane, epoxy and zinc silicate coatings.
  • After 24 hours without circulation the emulsion splits into water and oil containing Careclean Degreaser Heavy Duty Split.

Application

  • Ideal tankcleaning product for removal of mineral oils and fats.
  • May be used full strength in spraying application method.
  • Excellent for removal of residues from engine room floor plates and decks.

Directions for use

  1. Degreasing
    1. General cleaning Dependant upon the degree of contamination Careclean Degreaser Heavy Duty Split can be used pure, or diluted with water as a 2 to 20% emulsion at temperatures of 20 - 50 °C. After cleaning rinse with water. 
Note: When making up an emulsion always add the product to the water in that order, whilst stirring constantly. 
2. Floorplate maintenance. Careclean Degreaser Heavy Duty Split should be used undiluted when cleaning decks and floorplates. Spray the area to be cleaned with full strength product and allow to soak for between 10 to 30 minutes. Brush the treated surface occasionally and finally rinse with water.
Important note: Before commencing any cleaning all rubber type sealing rings etc. should be tested for compability with the cleaning solution.

Saturday 10 March 2012

Gulf of Aden - HRA Allowance

Following is my interpretation of the Gulf of Aden transitting vessels crew HRA Allowance. This is only my personal thought, and does not really mean that I'm correct in this regard. This will need to be clarified by ITF directly, which as I understand, no company is wanting to.

The wordings of the ITF declaration in this regard is as follows:
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Given continuing pirate attacks on merchant ships despite the presence of a number of international navies, the Joint Negotiating Group (JNG) and the International Transport Workers Federation (ITF) agreed in London, United Kingdom to extend the geographical coverage of the IBF High Risk Area and terms and conditions applying in said area as follows:

1. With effect from 0001Z on 1st April 2011 the Extended Risk Zone is as follows:

“The western border of the Zone runs from the coastline at the border of Djibouti and Somalia to position 11 48 N, 45 E; from 12 00 N, 45 E to Mayyun Island in the Bab El Mandeb Straits.
The eastern border is set at 78 E, the southern border is set at 10 S and the Northern Border set at 26 N.”

The IBF Extended Risk Zone Map is attached in Annex.

2. The IBF constituents have agreed that during a vessel’s transit of the Extended Risk Zone protection of seafarers through the provision of increased security measures should be adopted. Such measures must be above the latest Best Management Practice level and may include the provision of personnel or systems which appropriately reduce the vulnerability of a vessel. The sufficiency of such extra security measures should be determined depending on vessel type, size, freeboard during transit and speed, with consulting and seeking advice of respective ITF union(s) where necessary.

3. The IBF constituents confirm that the adoption of Best Management Practice is required of all vessels operating under IBF agreements as a minimum standard of protection.

4. Within the Extended Risk Zone the IBF constituents agree to retain the previously designated IBF High Risk Area as it is recognised that the pirate attacks emanate mainly from bases in this region. The Western Border of this High Risk Area runs from the coastline at the border of Djibouti and Somalia to position 11 48 N, 45 E; from 12 00 N, 45 E to Mayyun Island in the Bab El Mandeb Straits. The Eastern Border runs from Rhiy di-Irisal on Suqutra Island to position 14 18 N, 53 E; from 14 30 N, 53 E to the coastline at the border between Yemen and Oman, together with a 400 mile zone off the eastern coast of Somalia, i.e. from Suqutra Island down to the Kenian border in the South.

5. During the period of transit of the area designated as the IBF High Risk Area seafarers shall be entitled to compensation amounting to 100% of the basic wage and a doubled compensation payable in case of death and disability. This entitlement should apply on each day of the vessel’s stay in the High Risk Area.

6. In the case of vessels that will transit the IBF High Risk Area outside of the east bound and west bound lanes created under the International Recommended Transit Corridor (IRTC), seafarers have the right not to proceed with the passage. In such an event, the seafarer concerned shall be repatriated at the company’s cost with benefits accrued until date of return to the port of engagement. This entitlement shall only apply in respect of vessels which are bound to enter the IBF High Risk Area, and will not apply in case of crossing the rest of the Extended Risk Zone.

7. Vessels may deviate from the International Recommended Transit Corridor (IRTC) lanes without affecting the terms and conditions for the seafarers onboard for collision avoidance purposes only, as long as they are returned to the original lanes as soon as it is safe and practicable to do so.

8. During the period of transit of the IBF Extended Risk Zone, outside the area which is designated as High Risk Area, each seafarer shall be entitled to a bonus equal to 100% of the basic wage [the entire interpretation would change here and be absolutely clear if there was a comma or a full stop here, the hyphen in the next clause should be read only applicable to doubled compensation during attack in case of injury or death] and a doubled compensation in case of injury or death - on any day during which the vessel he serving on is attacked. The proof of these entitlements shall be subject to a confirmed entry into the ship’s log book and a report of attack being lodged with recognised international reporting authorities, such as UK MTO. The maximum period when these entitlements may apply shall not exceed the number of days of the vessel’s transit of the IBF Extended Risk Zone outside the area designated as High Risk Area. For the purpose of this article an attack means any unauthorised and obvious action taken by a third party in a wilful attempt to board or damage the vessel or to harm the crew which leads to the activation of the relevant vessel contingency plans including the alerting of the whole crew.

9. The IBF constituents believe that, in order to assist the military efforts to counter piracy in this region, all vessels that are subject to a confirmed attack should report to international navies present in the area or other relevant authority, to assist in the deployment of naval resources to appropriate areas, where piracy attacks are occurring.


10. Within all of the IBF Extended Risk Zone, including the High Risk Area, the above identified entitlements to double basic pay and double compensation for injury or death will not apply while vessels are alongside a berth, at anchor in secure anchorages off ports or attached to SBM facilities - with exception of Somali waters and ports. It is understood that vessels will have to transit the high risk area in order to proceed to certain ports and as such the bonuses mentioned in above should cease when a vessel is either all secure alongside, brought up to her anchor or fully coupled to a SBM in any port of the IBF Extended Risk Zone, excluding Somalia. Likewise when sailing, the applicability of bonuses etc. should commence when the vessel is “all gone”, i.e. the last line is let go from a berth, when the anchor is aweigh or a vessel has de-coupled from a SBM.

11. This Revision of the IBF High Risk Area remains in force from 0001Z on 1st April until any further revision or amendment is adopted by the constituents of the International Bargaining Forum.

/////////////

If the above text is taken by the law of implied terms, and the principle of consistency, the points 8 and 10 automatically would suggest that the allowance of basic wages is applicable for a vessel when sailing through the HRA / IRTC and then entering the Extended Risk zone. Point 10 will have no meaning otherwise, because it is obvious that in the Extended Risk Zone (excluding Somalia) there would be no allowance applicable unless a pirate attack takes place at the port of departure immediately following "all gone and clear".

The context of Points 5 and 8 and all the relevant points above dealing with seafarer rights and compensation can work in three ways:

1) Vessel transitting only the HRA / IRTC.

2) Vessel transitting only the Extended Risk Area and not entering the HRA. No compensation, unless attacked.

3) Vessel transitting the HRA as well as the Extended Risk Area. In such case, basis point 10 and the required legal consistency, the entire period should be covered.

Therefore the companies that are only paying 2 or 3 days basic allowance need to be woken up. The crew onboard should not be cheaply compromised for a short allowance of 50-200 dollars, when, they are the ones that are actually facing the raging bullets and the terror. But then, I'm no legal expert and I still maintain that the Piracy issue will not cease until the World stops looking at solutions like Naval Patrols and Armed Guards.

Everyone is profiting from it, except the poor seafarer, who is left facing the actual danger and agony for peanuts. Be it the Insurance companies, be it the Armed Guards or be it the Pirates. Oh and yes, Flag and Class are profiting too, because they're making money by writing dispensations and issuing short term certificates. So who do you think is actually wanting to let go of this money making racket!