What is the minimum pipe insulation thickness required for a steam pipe greater than 1.5 inches in diameter?

The minimum pipe insulation thickness required for a steam pipe greater than 1.5 inches in diameter is indeed 3 inches. Adequate insulation is crucial for steam pipes to ensure energy efficiency, reduce heat loss, and prevent burns from contact with hot surfaces. The specified thickness of 3 inches is based on industry standards that account for thermal efficiency and safety considerations.

For steam pipes, insulation thickness can vary based on the temperature of the steam and the diameter of the pipe, but for pipes larger than 1.5 inches, 3 inches is commonly required to maintain effective insulation levels. This thickness helps to minimize heat loss, which is essential in piping systems where maintaining thermal energy is important. Thus, the correct answer aligns with these established guidelines in thermal insulation practice.