Handling Precautions for Self Reactive Chemicals- Chemical Tanker Guide
Water-reactive chemicals are chemicals that react quickly with moisture. The most typical water-sensitive compounds include sodium, potassium, lithium metals, and aluminum alkyls. In contrast, self-reactive chemicals are thermally sensitive liquid or solid substances liable to sustain a strongly exothermic decomposition even without oxygen (air) participation. Acetylides, ozides, organic nitrates and many peroxides are examples of shock-sensitive material that are decomposed when heated. The heat initiated decomposition are almost instantaneous. However, this definition excludes materials categorized as explosives, organic peroxides, oxidizing liquids, or oxidizing solids.
Before loading above explained self reactive substances, a responsible Officer must ensure that there are no traces of other substances,
which may promote self-reaction of the cargo to be loaded in the cargo tanks and the cargo
systems.
Certificate of Inhibition
Care must be taken to ensure that the cargoes are sufficiently inhibited to prevent polymerisation during the entire voyage. When the ship carries such cargoes, a Certificate of Inhibition in which the following items are shown must be given by the shipper, or the manufacturer of the cargoes:
Cargo Tanks Vent System
The cargo tanks vent system must be regularly checked for adequacy of operation to avoid blockage from polymer build-up.
Temperature Control
The effectiveness of the inhibitor in a cargo may be reduced if the cargo temperature exceeds the value shown in the certificate of inhibitor content. Care must be exercised to maintain the temperature well within these limits to maintain the effectiveness of the inhibitor. When the loading plan for the voyage is prepared, the location of tanks with self reactive cargoes is to be considered carefully, to avoid loading next to heated cargoes or bunkers.
Crystallisation or solidification of cargoes, normally carried in the molten state, can lead to depletion of the inhibitor in parts of the tank contents. Subsequent remelting can yield pockets of inhibited liquid with the accompanying risk of dangerous polymerisation. To prevent this, care must be taken to ensure that at no time are such cargoes allowed to crystallise or solidify, either wholly or partially, in any part of the tank by using the appropriate ‘agitation’ method.
Related Info:
Voyage planning and related considerations
Cargo sampling safety precautions
Preparation for cargo operation
Preparing a cargo tank atmosphere
Cargo unloading operation safety precautions
Liaison between ship and shore
Cargo care during transit
Ship shore safety checklist while alongside a terminal
Loading, discharging & care of Phenol - Safety guideline
Hazards of Phenol - safe handling of Phenol on chemical tankers.
Handling benzene & methanol safety precautions
Personal protective equipments for carcinogens & cyanide-like cargoes onboard chemical tankers
Handling ACRYLONITRILE safety precautions
handling ISOCYANATES safety precautions
Loading, carrying & discharging of Sulphuric acid - regulatory requirements & special handling methods
Product characteristics & special arrangements for carrying Phenol onboard
Handling various grade liquid chemicals during loading
How to prepare a cargo loading or discharge program ?
How to avoid solidification in cargo tanks ?
Cargo line clearance requirement for chemical tankers
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 of toxic chemical cargoes
Following reference publications provide useful guidance and international regulations for carrying hazardous chemicals at sea.
Main Info pages!
Home page ||| Chemical hazards ||| Cargo planning & Stowage ||| Cargo loading ||| Cargo documents ||| Safe stability ||| Cargo care ||| Preparation for unloading ||| Inert gas systems |||Gas freeing ||| Nitrogen handling ||| Chemical handling Safe practice |||Handling equipments ||| Cargo & Ballast pumps ||| Cargo tanks |||Tank cleaning |||Special cargoes |||Spills emergencies |||Fire protection
Chemicaltankerguide.com is merely an informational site about various aspects of chemical tankers and safety tips that may be particular value to those working in: Chemical Handling, Chemical Storage, Liquefied Chemical Suppliers, Chemical Shipping, Chemical Transportation, Chemical Terminals, Bulk Chemical Services and Chemical Processing. If you are interested in finding out more about chemical tanker guideline please visit IMO official website. For any comment please Contact us
Copyright © 2011 Chemical Tanker Guide.com All rights reserved.
Certificate of Inhibition
Care must be taken to ensure that the cargoes are sufficiently inhibited to prevent polymerisation during the entire voyage. When the ship carries such cargoes, a Certificate of Inhibition in which the following items are shown must be given by the shipper, or the manufacturer of the cargoes:
- Name and amount of inhibitor added.
- Date inhibitor was added and the length of its effectiveness.
- Any temperature limitations qualifying the inhibitor’s effective lifetime.
- The action to be taken should the length of the voyage exceed the effective lifetime of the inhibitor.
Cargo Tanks Vent System
The cargo tanks vent system must be regularly checked for adequacy of operation to avoid blockage from polymer build-up.
Temperature Control
The effectiveness of the inhibitor in a cargo may be reduced if the cargo temperature exceeds the value shown in the certificate of inhibitor content. Care must be exercised to maintain the temperature well within these limits to maintain the effectiveness of the inhibitor. When the loading plan for the voyage is prepared, the location of tanks with self reactive cargoes is to be considered carefully, to avoid loading next to heated cargoes or bunkers.
Crystallisation or solidification of cargoes, normally carried in the molten state, can lead to depletion of the inhibitor in parts of the tank contents. Subsequent remelting can yield pockets of inhibited liquid with the accompanying risk of dangerous polymerisation. To prevent this, care must be taken to ensure that at no time are such cargoes allowed to crystallise or solidify, either wholly or partially, in any part of the tank by using the appropriate ‘agitation’ method.
Related Info:
Voyage planning and related considerations
Cargo sampling safety precautions
Preparation for cargo operation
Preparing a cargo tank atmosphere
Cargo unloading operation safety precautions
Liaison between ship and shore
Cargo care during transit
Ship shore safety checklist while alongside a terminal
Loading, discharging & care of Phenol - Safety guideline
Hazards of Phenol - safe handling of Phenol on chemical tankers.
Handling benzene & methanol safety precautions
Personal protective equipments for carcinogens & cyanide-like cargoes onboard chemical tankers
Handling ACRYLONITRILE safety precautions
handling ISOCYANATES safety precautions
Loading, carrying & discharging of Sulphuric acid - regulatory requirements & special handling methods
Product characteristics & special arrangements for carrying Phenol onboard
Handling various grade liquid chemicals during loading
How to prepare a cargo loading or discharge program ?
How to avoid solidification in cargo tanks ?
Cargo line clearance requirement for chemical tankers
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 of toxic chemical cargoes
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
Main Info pages!
Home page ||| Chemical hazards ||| Cargo planning & Stowage ||| Cargo loading ||| Cargo documents ||| Safe stability ||| Cargo care ||| Preparation for unloading ||| Inert gas systems |||Gas freeing ||| Nitrogen handling ||| Chemical handling Safe practice |||Handling equipments ||| Cargo & Ballast pumps ||| Cargo tanks |||Tank cleaning |||Special cargoes |||Spills emergencies |||Fire protection
Chemicaltankerguide.com is merely an informational site about various aspects of chemical tankers and safety tips that may be particular value to those working in: Chemical Handling, Chemical Storage, Liquefied Chemical Suppliers, Chemical Shipping, Chemical Transportation, Chemical Terminals, Bulk Chemical Services and Chemical Processing. If you are interested in finding out more about chemical tanker guideline please visit IMO official website. For any comment please Contact us
Copyright © 2011 Chemical Tanker Guide.com All rights reserved.