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Piping and fittings for refrigerant vapor (suction) lines shall be insulated with insulation having a thermal resistivity of not less than R-3 and having external surface permeance not exceeding 0.05 perm [2.87 ng/(s × m2 × Pa)] when tested in accordance with ASTM E96.
M1411.6.1 Refrigerant Line Insulation Protection
Refrigerant piping insulation shall be protected in accordance with Section N1103.4.1.

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1109.2.7 Refrigeration, Pipe Identification
identification shall be located at intervals not exceeding 20 feet (6096 mm) on the refrigerant piping or pipe insulation. The minimum height of lettering ...