Tuesday, September 20, 2011

CHEMICAL TANKER TYPES - CAPT AJIT VADAKAYIL



            IMO SHIP TYPES- CHEMICAL TANKERS

  

All 3 types are meant to carry chapter 17 cargoes of IBC code.


Type I ships must be able to survive assumed damage anywhere in their length. Cargo tanks for the most dangerous products should be located outside the extent of the assumed damage and at least 760mm from the ship's shell. 

IMO type 1, 2 and 3. Other cargoes, which present a lesser hazard may be carried in tanks next to the hull-  ( incl diluted slops after tank washings )  See layout below--

Some of the chemicals carried on type one ships are Chlorosulphonic acid, Dodecyl phenol, Phosphorous yellow/ white, Tricresyl Phosphate (>1% ortho-isomer), Trixylyl Phosphate.

Maximum tank size is 1250 M3.

Double side width B/5 or 11.5 mtrs which ever is less.

DB depth B/15 or 6 mtrs at centre line, but not < 760mm .

Auto ignition temperature of cargoes <65 deg C.

Explosive range >50% by volume in air.

Type 1 offers highest limit of containment.

  

Type II ships, if more than 150m in length, must be able to survive assumed damage anywhere in their length; if less than 150m, the ship should survive assumed damage anywhere except when it involves either of the bulkheads bounding machinery spaces located aft. Tanks for Type II cargoes should be located at least 760mm from the ship's shell and outside the extent of assumed grounding damage.

Maximum tank size is 3000 M3.

Capable of stripping tanks <100 litres.

Auto ignition temp of cargoes <200 deg C.

Explosive range >40% by volume in air.



Type III ships, if more than 125m in length, should be capable of surviving assumed damage anywhere in their length except when it involves either of the bulkheads bounding the machinery space.  If less than 125m in length, they should be capable of surviving damage anywhere unless it involves machinery spaces. There is no special requirement for cargo tank location. No limit for size of tank.

Capable of stripping tanks <300 litres with tolerance of 50 litres.
 
Length > 125 m but < 225 m damage anywhere in length except including ER bulkheads

Length <125 m damage anywhere in length except machinery space


After 1 January 2007 vegetable oils have to be carried in chemical tankers complying with the revised IBC Code as a Ship Type-2 (double hull) with COF as Cat Y.




-------CAPT AJIT VADAKAYIL
(29 YEARS IN COMMAND )


                                                                                                          

18 comments:

  1. hi Capt.

    I have question about the stowage rates of chemical cargoes

    for sure it will have wide range between all chemical cargoes transported by sea

    can you tell me what is the minimum and maximum stowage rate of chemicals transported by sea ?

    thanks in advance

    ReplyDelete
  2. Hello Capt.
    I have one question how are the chemicals categorized
    on type 1,or type2 or type 3 chemical tankers. I mean chap 17 of Ibc code include many chemicals then on what bases it is decided which type of chemicals to be carried by type 1,2 or 3.
    pls give few examples of each type of chemicals
    Thank you

    ReplyDelete
  3. hi deepak,

    i have posted what you want already--long ago..

    check it out.

    off hand i can remember you can punch into google search

    CHEMICAL HAZARDS ON CHEMICAL TANKERS- VADAKAYIL.

    capt ajit vadakayil
    ..


    ReplyDelete
  4. hello captain what is COW operation in oil tankers?

    ReplyDelete
    Replies
    1. hi deva,

      when we were young cadets and the ship had to go to dry dock for repairs, we washed tanks with water.

      there used to be a huge amount of sludge ( knee deep sometimes ) at the bottom of the tanks, which we demucked manually and threw it into the sea.

      you cant do that any more-- as pollution regulations are strict.

      instead of using water we use CRUDE OIL itself to wash the tanks with fixed machines.

      the solvent effect of oil makes the tanks perfectly clean. LIKE CUTS LIKE principle.

      after COW, and drying the tanks, we can enter the tanks with uniform -- it is that clean.

      of course we give a cursory water wash so that hot work can be done.

      capt ajit vadakayil
      ..

      Delete
  5. Good day Captain, I just wanna ask what are the contents of chapter 17 cargoes because im going to report in my class. Thank you

    ReplyDelete
    Replies
    1. hi a1234,

      i do NOT take such questions.

      capt ajit vadakayil
      ..

      Delete
  6. Hello captain.
    Can you help me to share links related to evolution of chemical tankers? Because I cant find any that explain briefly about the evolution of chemical tankers.
    Thank you in advance!

    ReplyDelete
  7. HELLO SIR,
    can u help me about how the palm oil is carried and the extra system used in palm oil tanker?

    ReplyDelete
    Replies
    1. http://ajitvadakayil.blogspot.in/2010/11/vegetable-oils-and-fats-on-chemical.html

      Delete
  8. Sir kindly advise on the certificate of fitness and why it is not issued for product tankers and crude oil tankers?

    ReplyDelete
    Replies
    1. http://ajitvadakayil.blogspot.in/2010/12/certificate-of-fitness-on-chemical.html

      Delete
  9. Hello sir,
    Would like to enquire regarding what all Tanker Endorsements(DCEs) are required for MT ALPINE LOYALTY?

    ReplyDelete
  10. dear Sir... Wats the name of the ibc code 17..,?

    ReplyDelete
    Replies
    1. http://ajitvadakayil.blogspot.in/2010/12/certificate-of-fitness-on-chemical.html

      http://ajitvadakayil.blogspot.in/2010/06/marpol-rules-for-annex-2-chemical_6733.html

      Delete
  11. Sir, Why there is limited quantity in type 1 and type 2 chem tanker? Why cant we carry more?

    ReplyDelete
  12. sir with new regulations can their be single hull chemical tankers(type 3)

    ReplyDelete