Diesel Fuel Classes Diesel Fuel Classes Prajna21 (Mechanical) (OP) 3 Sep 08 09:47 As referred to in NFPA, what class of fuel is No. 2 diesel?NFPA, International Fire Code, etc. refer to fuels as Class IIIB, or Class II, and so on. Where can I find a simple list in laymen's terms of what fuels fall into which classes. RE: Diesel Fuel Classes BigInch (Petroleum) 3 Sep 08 10:41 Click on the [USE DATABASE] button!http://www.nrel.gov/vehiclesandfuels/fuels_database.html "I think it would be a good idea." - Mahatma Gandhi (1869-1948), when asked about Western civilization RE: Diesel Fuel Classes JLSeagull (Electrical) 3 Sep 08 10:56 Perhaps you are looking for the NFPA 3O information. You need to verify the flash point for the Number 2 fuel oil as several specifications exist. Marine Diesel may be lower than road or non road Diesel.Lacking other data, consider ASTM D 396 grade No. 2 S500 for domesting home heating oil. ASTM D 396 shows No 2 S500 and S5000 with a minimum flash point of 38 degree C.Class IA Liquid —Any liquid that has a flash point below73°F (22.8°C) and a boiling point below 100°F (37.8°C)Class IB Liquid —Any liquid that has a flash point below73°F (22.8°C) and a boiling point at or above 100°F(37.8°C)Class IC Liquid — Any liquid that has a flash point at orabove 73°F (22.8°C), but below 100°F (37.8°C)Class II Liquid — Any liquid that has a flash point at orabove 100°F (37.8°C) and below 140°F (60°C)Class III Liquid — Any liquid that has a flash point at orabove 140°F (60°C)Class IIIA Liquid—Any liquid that has a flash point ator above 140°F (60°C), but below 200°F (93°C)Class IIIB Liquid—Any liquid that has a flash point ator above 200°F (93°C)... RE: Diesel Fuel Classes tickle (Chemical) 3 Sep 08 23:47 http://flashoffroad.com/Diesel/DieselFuel/about_diesel_fuel.htmDiesel fuel lies in the middle of the refined petroleum hierarchy and is considered one of the middle distillates -- slightly heavier than kerosene and slightly lighter than industrial (bunker) fuel oil. Like automotive gasoline, diesel fuel is refined into several sub-categories or grades. From highest to lowest (SEEMS WRONG WAY AROUND TO TICKLE) viscosity are Number 1 Diesel Fuel (1-D), Number 2 DieselFuel (2-D) and Number 4 Fuel Diesel (4-D). There used to be a Number 3 Diesel Fuel (3-D), but it is no longer refined.Numbers 1 and 2 Diesel Fuel are the primary fuel for mobile diesel engine applications. Number 1 Diesel Fuel is commonly labeled at the pump as "Premium Diesel" or with a Cetane number of 44 or 45. It is not as thick as Number 2 Diesel Fuel and for this reason is the choice for motorists during the cold winter months. The disadvantage of Number 1 Diesel Fuel is that it does not have the lubricating qualities associated with Number 2 Diesel Fuel. While Number 2 Diesel Fuel has a higher lubricating quality than Number 1 Diesel, its thickness can cause rough starting in a cold engine and rough-running in cold weather. Number 2 Diesel Fuel is usually labeled at the pump with a Cetane number of 40.