Allowable limit for Sulphur content in fuels

 The allowable limit for sulfur content in fuels varies depending on the type of fuel and the regulations imposed by different countries or regions. Here are some typical allowable limits for sulfur content in various fuels:

1. Gasoline:

   • Many countries have mandated ultra-low sulfur gasoline (ULSG) with sulfur content typically below 10 parts per million (ppm). Some regions may allow slightly higher sulfur content, but generally, sulfur levels are kept low to minimize emissions from vehicles equipped with catalytic converters.

2. Diesel Fuel:

   • Ultra-low sulfur diesel (ULSD) has become the standard in many parts of the world, with sulfur content typically below 15 ppm. This ultra-low sulfur diesel is required for use in modern vehicles equipped with advanced emissions control systems to meet stringent emissions standards.
   • In some regions, particularly those with older vehicle fleets or less stringent regulations, higher sulfur diesel fuel may still be permitted, but it is becoming increasingly less common.

3. Heavy Fuel Oil:

   • The allowable sulfur content in heavy fuel oil (HFO) used for industrial and marine applications can vary widely depending on local regulations and the specific application. In some regions, especially those with strict emissions standards for ships, low-sulfur marine fuels with sulfur content below 0.5% or even 0.1% are required.
   • Some areas may allow higher sulfur content in heavy fuel oil used for stationary industrial applications, but emission control measures may still be required to comply with air quality regulations.

4. Natural Gas and Propane:

   • Natural gas and propane typically have very low sulfur content, often below detectable levels. Their sulfur content is usually well below regulatory limits, and they are considered cleaner-burning fuels compared to liquid fuels like gasoline and diesel.

5. Coal:

   • The allowable sulfur content in coal can vary widely depending on its type and intended use. Low-sulfur coal, with sulfur content below 1%, is often preferred for power generation to minimize sulfur dioxide emissions. High-sulfur coal may still be used in some regions, but emission control technologies may be required to reduce sulfur emissions.

It's important to note that these limits are subject to change as regulations evolve to address environmental concerns and improve air quality. Additionally, some regions may impose stricter limits than others, depending on local environmental conditions and policy priorities. Compliance with sulfur content regulations often requires investments in refining processes and emissions control technologies to produce and use cleaner fuels with lower sulfur content.