1.11. Heat-Traced Pipe: Insulation Thickness
Piping which is heat traced shall be insulated with oversize pipe insulation to include the tracer lines. Valves, flanges, unions, and tracer line loops shall not be insulated, unless specified on the piping spool drawings. The thickness of insulation shall be in accordance with Table 1.28.
The thicknesses given in the tables do not include the cleading or finishing, the insulation of which is neglected.
Where proved to be more economical, the insulation should consist of two or more layers of dissimilar approved materials provided their respective service temperature limits are appropriate for the duty. Multilayer insulation shall have the inner layers banded or taped to the pipe or equipment.
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