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Liquid Chemical Cargoes loading / discharge plan

A wide range of liquid chemical cargoes is transported in bulk by purpose-built tankers. Such cargoes can be broadly categorised as (a) chemicals which are liquid at ambient conditions and (b) those which are gases under ambient conditions but are liquefied for bulk shipment by the application of high pressure or low temperature. These commodities generally undergo processing in the chemical industry that may involve expensive and sensitive catalysts which are susceptible to irreversible damage by contaminants in the feedstock. Consequently, most chemical commodities are manufactured to a high level of purity and require very careful handling during loading, carriage and discharge to ensure that the product remains in perfect condition at out-turn.

Careful planning prior to loading is obviously essential and the following key points are amongst those that should be considered.
Cargo Plan, Stowage Plan – A plan showing the distribution of all cargo parcels stored on board of a vessel for a voyage. Each entry on the plan details the quantity, weight and port of discharge. A plan presenting the quantities and description of the various grades carried in the ship cargo tanks after the loading is completed.

For quick reference throughout the cargo operations onboard chemical tanker it is responsibility of ships chief officer to prepare a loading/discharge programme , which is to include, but not be limited to, the following (note additional information can be appended): The Chief Officer, in conjunction with another officer, will ensure that all valves on the cargo and ballast systems, including the pumproom, whether in use or not, are correctly set for the intended operation.

The Cargo Loading/Discharge Plan is to be approved by the Master and signed by each Officer and Pumpman involved in the cargo operations. Junior Officers should, whenever possible, be actively encouraged to assist in cargo planning, line setting and the execution of ballast and cargo activities. This plan is to be discussed and agreed in writing with the terminal personnel as described in these procedures.

The following conventions/rules, procedures and manuals must be complied with when preparing/planning cargo loading operations.
  1. Load Line Convention
  2. IBC Code/BCH Code
  3. Certificate of Fitness
  4. Ship’s stability information
  5. Resistance list for stainless steel
  6. Resistance list for cargo tank coatings where applicable
  7. Cargo hose resistance list
  8. MEPC 2/Circ.
  9. Product information
  10. Chemical Hazard Data Sheets / Material Safety Data Sheets
  11. Tank filling Limits
  12. P&A Manual
  13. U.S. Coastguard Compatibility Chart (See section 16)
  14. USCG CHRIS code (Condensed)
  15. ICS Chemical Tanker Safety Guide
  16. ISGOTT
  17. Local Regulations

Related Info:

Voyage planning and related considerations

Preparation for cargo operation

Preparing a cargo tank atmosphere

Cargo unloading operation safety precautions

Liaison between ship and shore

Cargo line leakage countermeasures

Checklist for handling dangerous liquid chemicals in bulk

Recommended temperature monitoring equipments onboard

Practical example of solving tank cleaning problems

Pre-cleaning /washing of cargo tanks

Risk & hazards of chemical contamination onboard

Cargo compatibility and reactivity of various chemical cargo

Poisoning and required first aid treatment onboard

Chemical tanker safe mooring practice

Determining presence of contaminants in chemical cargo

Handling various grade liquid chemicals during loading

How to prepare a cargo loading or discharge program ?

How to avoid solidification in cargo tanks ?

Cargo segregation requirement for chemical tankers

How to arrange disposal of tank cleaning waste ?

Restrictions on discharge cargo residue into sea

Retention of slops on chemical tankers

Vapour emission control requirement for chemical tankers

Handling self reactive chemicals

Handling of toxic chemical cargoes

Pre-loading meeting safety consideration

How to determine chemical cargo temperatures at different level ?

Cargo line clearance requirement for chemical tankers

Care of cargo pums - risk of pump overload or underload

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