What type of insulation is most commonly used for high-pressure steam piping?

Calcium silicate is commonly used for insulating high-pressure steam piping because of its excellent thermal insulation properties and its ability to withstand high temperatures. It is specifically designed to handle the temperature ranges typically found in steam systems, making it suitable for both thermal efficiency and safety.

Calcium silicate insulation is also non-combustible, which is a critical factor when insulating high-pressure steam lines to prevent fire hazards. Its structural integrity allows it to sustain high temperatures without degrading, ensuring that it maintains its insulating properties over time. Additionally, calcium silicate is resistant to moisture absorption, which helps to prevent corrosion under insulation (CUI) by protecting the piping from condensation build-up.

The other materials listed do have their applications in insulation, but they do not match the specific requirements for high-pressure steam piping. For example, while fiberglass and mineral wool can provide effective insulation, they are not as effective as calcium silicate at these high temperatures. Polyurethane foam, although effective in certain applications, is not typically used for high-temperature steam lines due to its lower thermal stability compared to calcium silicate.