Ship to ship transfer using vapour emission control

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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.

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

At least one of the vessels must be able to permanently monitor the oxygen content of the vapour stream. The sample point must be close to the manifold and audible and visual alarms are to be available should the oxygen content exceed the agreed value.
The oxygen content of all tanks in the common system is to be maintained at a level no higher than the agreed value.
The vapour transfer hose is to be purged of air using inert gas or nitrogen until the oxygen content is below the agreed value before transfer commences.
Vapour manifold valves are not to be opened until the receiving vessel system pressure exceeds that of the discharging vessel system pressure.

During the Cargo Transfer:

For inerted system, operations are to be terminated, if the oxygen content of the vapour stream exceeds the agreed value. Operations are not to be resumed until the oxygen content in the receiving ship has been reduced below the agreed value.
There is to be frequent monitoring of both ship’s IG pressures with cross comparison on a regular basis and at least hourly. Transfer volumes are to be compared on the same basis.
No air is permitted to enter the tanks of the discharging ship at any time
The guide lines contained in the OCIMF Ship to Ship Transfer Guide ( Petroleum) and ICS Chemical Tanker Safety Guide Ch 5.14 shall be complied shall be adhered to for the STS operation.

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

SOLAS (latest consolidated edition)
MARPOL – 73/78 (latest consolidated edition)
BCH / IBC Code
International Safety Guide for Oil Tankers and Terminals (ISGOTT)
Tanker Safety Guide (Chemicals)
Ship to Ship Transfer Guide (Petroleum)
Safety in Oil Tankers
Safety in Chemical Tankers
IMDG Code
Supplement to IMDG Code (Including MFAG and Ems)
SOPEP
Clean Seas Guide for Oil Tankers
FOSFA (for Oils, Seeds and Fats)
Prevention of Oil Spillage through Cargo Pumproom Sea Valves
CHRIS Guide (USCG)
Chemical Data Guide for Bulk Shipment by Water (Condensed Chris)
MSDS for particular cargo carried
Chemical Tank Cleaning Guide

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