New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test

Which of the following is NOT a commercial grade of fuel oil?

1. 1

2. 3

3. 4

4. 6

The correct answer is: 3

The correct answer identifies that grade 3 is not a commercial grade of fuel oil in the context of New York’s regulations and industry standards. Understanding the classification of fuel oils is fundamental for operating and maintaining low pressure boilers safely and effectively. Fuel oils are classified into different grades based on their properties and intended uses. In general, grades 1 and 2 are light distillates commonly used for residential heating and smaller applications, while grades 6 is a heavier oil used in commercial and industrial settings. They differ primarily in viscosity and sulfur content, which influences where and how they can be used. Grade 3 does not have a defined commercial standard and is not listed among the standard fuel grades used in the industry, which is why it stands out as the correct choice here. The omission of grade 3 from recognized commercial grades highlights the standards set for fuel oils, encouraging operators to familiarize themselves with appropriate types and classifications relevant to their boiler operations.