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Ship to ship transfer using vapour emission control - chemical tankers procedure

Before carrying ship to ship transfer operation using VEC systems reference is to be made to the operational guidelines contained within ISGOTT, ICS Chemical Tanker Safety Guide and other applicable reference publications.

The technique is properly described as Vapour Balancing Use of Inert Gas for oxygen dependent inhibited cargoes may be dangerous (e.g. Styrene Monomer). IBC code requirements for specific cargoes to complied with. The vessels VECS manual requirements are to be complied with.

Before commencing transfer the following operational precautions must be complied with as a minimum for inerted tanks and non inerted tanks as applicable. During the Cargo Transfer:


Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.







Related Info:

PV valves operation, maintenance& safety precautions

Ship to ship transfer guideline using VEC systems

Cargo unloading operation safety precautions

Liaison between ship and shore

Preparation for cargo operation

Preparing a cargo tank atmosphere

Controlling the atmosphere in cargo tanks with nitrogen supplied from shore

Ship shore safety checklist while alongside a terminal

Cargo handling safe practice for chemical products

Cargo compatibility and reactivity of various chemical cargo

Poisoning and required first aid treatment onboard

Determining presence of contaminants in chemical cargo

Checklist for handling dangerous liquid chemicals in bulk

Ship shore safety checklist while alongside a terminal

Isolation of cargo tanks and piping systems

Ship shore cargo connection safe method

Venting of cargo tanks safety procedure

Ship to ship transfer operation

Controlling the atmosphere in cargo tanks with nitrogen supplied from shore



Effects of Tugs and other craft alongside chemical tankers

Primary means of cargo connection between ship and shore

Means of access (gangways or accommodation ladders) safety precautions

Ship/Shore Safety Checklist

How to prepare a cargo loading / discharge plan ?

Technical readiness prior loading operations

Voyage planning and related considerations

Cargo sampling safety precautions

Cargo calculation

Signing a bill of lading and related guideline

Preparation for cargo operation

Preparing a cargo tank atmosphere

Cargo unloading operation safety precautions

Liaison between ship and shore

How to prevent cargo pipeline leakage

Ship shore safety checklist while alongside a terminal


Reference publications

  1. IBC Code / BCH code
  2. International Safety Guide for Oil Tankers and Terminals (ISGOTT)
  3. ICS Chemical Tanker Safety Guide
  4. Ship’s “Procedure and Arrangements Manual” (Approved by Class)
  5. Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk
  6. Ship’s “VEC System Operational Manual” (Approved by Class)
  7. Ship to Ship Transfer Guide (Petroleum)
  8. Tank Cleaning Manual




Other 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

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 ?

How to take cargo samples ?

How to avoid solidification in cargo tanks ?

Cargo line clearance requirement for chemical tankers

How to arrange disposal of tank cleaning waste ?

Care of cargo pums - risk of pump overload or underload


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