What is the maximum steam pressure carried by low pressure boiler pipes?

The maximum steam pressure carried by low pressure boiler pipes is 15 psi. This is a widely accepted standard where low pressure steam systems operate at or below this pressure threshold. In many jurisdictions, a boiler operating at 15 psi or less is classified as a low pressure boiler, meaning that it is designed for applications that do not require high steam pressures for efficient operation.

Operating at 15 psi allows for safe and effective heat transfer in residential and light commercial applications, where high-pressure steam systems are not practical or necessary. This designation is also important for safety regulations, maintenance procedures, and insurance implications. Understanding the classification of low pressure boilers is essential for home inspectors or professionals working with heating systems to ensure compliance with safety standards and regulations.