1.13. General Application of Thermal Insulation

1.13.1. Conditions in Which Thermal Insulation Shall Be Applied

Thermal insulation shall be applied to the piping, vessels, and equipment with the following range of applications and conditions.
Piping, vessels, and equipment operating over 5°C shall not be insulated unless required for heat control or acoustical control. Piping, vessels, and equipment operating above 55°C shall be insulated if necessary for personnel protection.
All piping, vessels, and equipment operating below 5°C shall be insulated to control the fluid temperature, for the conservation of refrigeration, or to control surface condensation. Operating temperatures of this specification refer to the internal fluid or material temperature ...

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