What does the stamp (h) on a boiler signify?

The stamp indicating (h) on a boiler signifies that it is classified as a low pressure boiler. This designation is essential for understanding the operational limits and safety requirements associated with the boiler. Low pressure boilers are typically defined as those that operate at pressures not exceeding 15 psi for steam and 160 psi for water.

The significance of this classification is critical for compliance with regulatory standards, maintenance procedures, and safety protocols. They often have different inspection requirements and operational practices compared to high pressure boilers, which operate at higher pressures and carry different risks and regulations.

In contrast, the other classifications such as power boiler or high pressure boiler denote equipment that functions under higher operational pressures or serves different purposes, often requiring more rigorous safety measures and inspections. Each stamp or designation carries specific regulatory implications, thus highlighting the importance of correctly identifying the boiler type.