Use of Magnesium & Aluminium alloys for modern chemical tankers
Alloys of magnesium and aluminium should never be used in the cargo tank area, due to their poor corrosion
resistance in such environments.
As sacrificial anodes these alloys are frequently used. They are severely attacked by caustic soda. Methanol will be severely contaminated by magnesium. Any anodes should be removed before loading these cargoes. Check cargo information.
There seems to be a belief that Al/Mg alloys are spark-proof materials, suitable for tank cleaning equipment etc. The truth is the opposite: "light alloys" are considerably more prone to cause incendive sparks than steel objects. When an object fall-s down into a tank light alloys oxidize at the point of contact, thus adding a reactive energy to the kinetic energy released. "Hot" sparks are created instead of "cold" sparks, which are created by steel objects falling down. As a flammable mixture requires a certain minimum amount of energy to trigger off an explosion it follows that "light alloys" are considerably more dangerous. Therefore: do away with tank cleaning gear of light alloys!
In this connection it can be mentioned that so-called spark free tools are no longer particularly recommended. Tests have shown that steel tools are equally safe.
Other Info pages
Cuprous alloys for shipbuilding of seagoing chemical tankers
Copper and its alloys corrode in many cargoes and may contaminate them, e g styrene, phenol, vinyl chloride, aniline, ammonia solutions etc. Check your cargo against information . Particularly aggressive are the ammonia compounds; they cause inter -crystalline corrosion of cuprous alloys very rapidly. The object in question disintergrates very soon. ....
Use of magnesium and alluminium alloys as sacrificial anodes
Alloys of magnesium and aluminium should never be used in the cargo tank area, due to their poor corrosion resistance in such environments. .....
Introducing rubber lined tanks for the transport of phosphoric acid, waste acids and hydrochloric acid
In recent years a number of ships have been fitted with rubber lined tanks, for the transport of phosphoric acid, waste acids and hydrochloric acid. .....
Tools for shipboard maintenance
Although grit blasting and the use of mechanically powered tools are not normally considered to fall within the definition of hot work, both these operations should only be permitted under controlled conditions. ......
Sea transport of various liquid chemicals at sea
Chemical tankers primarily transport organic and inorganic chemicals as well as vegetable oils and fats. The total global volume of chemicals is estimated at approximately 60 million metric tonnes per year. In addition, the transportation of vegetable oils, alcohols, molasses and lubricating oils amounts to 40 - 45 million tonnes per year. .....
stainless steel as shipbuilding materials for chemical tankers
Iron, steel Mild steel and high tensile steel is, and will continue to be the most important material in the building of chemical tankers and their cargo tanks.Steel is attacked by only a few products, mainly acids and, of course ballast and washing water. Steel itself contaminates very few products, one of them being high purity caustic soda. .... ....
Types of various chemical tankers at sea
modem chemical tanker is primarily designed to carry some of the several hundred hazardous products now covered by the IMO Bulk Chemical Codes. The following general types of chemical carriers have developed since the trade began: ....
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.
As sacrificial anodes these alloys are frequently used. They are severely attacked by caustic soda. Methanol will be severely contaminated by magnesium. Any anodes should be removed before loading these cargoes. Check cargo information.
There seems to be a belief that Al/Mg alloys are spark-proof materials, suitable for tank cleaning equipment etc. The truth is the opposite: "light alloys" are considerably more prone to cause incendive sparks than steel objects. When an object fall-s down into a tank light alloys oxidize at the point of contact, thus adding a reactive energy to the kinetic energy released. "Hot" sparks are created instead of "cold" sparks, which are created by steel objects falling down. As a flammable mixture requires a certain minimum amount of energy to trigger off an explosion it follows that "light alloys" are considerably more dangerous. Therefore: do away with tank cleaning gear of light alloys!
In this connection it can be mentioned that so-called spark free tools are no longer particularly recommended. Tests have shown that steel tools are equally safe.
Other Info pages
Cuprous alloys for shipbuilding of seagoing chemical tankers
Copper and its alloys corrode in many cargoes and may contaminate them, e g styrene, phenol, vinyl chloride, aniline, ammonia solutions etc. Check your cargo against information . Particularly aggressive are the ammonia compounds; they cause inter -crystalline corrosion of cuprous alloys very rapidly. The object in question disintergrates very soon. ....
Use of magnesium and alluminium alloys as sacrificial anodes
Alloys of magnesium and aluminium should never be used in the cargo tank area, due to their poor corrosion resistance in such environments. .....
Introducing rubber lined tanks for the transport of phosphoric acid, waste acids and hydrochloric acid
In recent years a number of ships have been fitted with rubber lined tanks, for the transport of phosphoric acid, waste acids and hydrochloric acid. .....
Tools for shipboard maintenance
Although grit blasting and the use of mechanically powered tools are not normally considered to fall within the definition of hot work, both these operations should only be permitted under controlled conditions. ......
Sea transport of various liquid chemicals at sea
Chemical tankers primarily transport organic and inorganic chemicals as well as vegetable oils and fats. The total global volume of chemicals is estimated at approximately 60 million metric tonnes per year. In addition, the transportation of vegetable oils, alcohols, molasses and lubricating oils amounts to 40 - 45 million tonnes per year. .....
stainless steel as shipbuilding materials for chemical tankers
Iron, steel Mild steel and high tensile steel is, and will continue to be the most important material in the building of chemical tankers and their cargo tanks.Steel is attacked by only a few products, mainly acids and, of course ballast and washing water. Steel itself contaminates very few products, one of them being high purity caustic soda. .... ....
Types of various chemical tankers at sea
modem chemical tanker is primarily designed to carry some of the several hundred hazardous products now covered by the IMO Bulk Chemical Codes. The following general types of chemical carriers have developed since the trade began: ....
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.