//
you're reading...
flash point, IMDG CODE

Flashpoint

Before going into the physics of flashpoint we must know that flashpoint is a very important point in determining stowage of flammable liquids on board vessels. Document of Compliance specifies the holds for carriage of flammable liquids on the basis of flashpoint.

IMDG Code defines flashpoint as the lowest temperature of a liquid at which its vapour forms an ignitable mixture with air.

Wikipedia: The flash point of a volatile material is the lowest temperature at which it can vaporize to form an ignitable mixture in air. Measuring a flash point requires an ignition source. At the flash point, the vapor may cease to burn when the source of ignition is removed.

English: Source: "Emergency Response Guid...

Let us see two examples of flashpoint

Petrol: -43 Deg C

Diesel: > 62 Deg C

If we light a match and bring it on the surface of petrol (DO NOT TRY IT) the vapours will flash but if same match is brought above diesel it won’t flash unless if diesel is heated at or above its flash point.

This shows that as long as the temperature of a liquid is below its flashpoint it will not have flammable hazard.

To determine the flash point there are various equipments. The liquid to be tested will be kept in a receptacle well below the expected flashpoint and heated slowly while bringing an open flame above its surface the lowest temperature the flash takes place is flashpoint. There are main two differences in this test, open-cup and closed cup. Where ever in IMDG Code a flashpoint is mentioned for any substance the figure is closed-cup.

Consignments of dangerous goods which have flashpoint at or below 60 deg C need to contain the flash point in closed-cup on the declaration.

About these ads

About Shashi Kallada

24 years in Merchant Shipping Last 11 years working on Packaged Dangerous Goods *Ex Sailor *Ex P&O Nedlloyd Dangerous Goods Specialist *Ex Manager Global Dangerous Goods Maersk Line + MCC Transport + Mercosul line and Safmarine South African export) *A Freelance Photographer *An amateur Cyclist

Discussion

No comments yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 449 other followers

%d bloggers like this: