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.