Which type of patch is NOT recommended for high pressure steam and flammable liquids?

Soft patches are not recommended for high pressure steam and flammable liquids primarily due to their material and structural limitations. These patches are typically made from less durable materials that may not withstand the extreme conditions and pressure dynamics associated with high-pressure systems. In cases of high pressure, there is a risk that a soft patch could fail, leading to serious safety hazards, including leaks or bursts that can cause explosive reactions with flammable liquids or significant steam leaks.

In contrast, other patch types such as Jubilee patches, EWARP patches, and Universal patches are specifically designed with materials that can handle higher pressure and are often tested for resilience in critical applications. Using a robust patching method is essential for ensuring the integrity of systems that manage high-pressure steam and flammable substances, thus emphasizing the importance of selecting the right type of patch for safety and effectiveness.