Division 22 23 Ebook Page 91 FOAMULAR XPS Pipe Insulation Installation Guidelines

Pub No. 10013974-B. Rev. 6/2016 Page 22 of 24 FOAMULAR XPS Pipe Insulation Installation Guidelines Design Table for Ammonia Refrigeration Outdoors ambient temp. = 100 o F outer surface = metal (E = 0.4) ambient relative humidity = 90% wind velocity = 7.5 mph dewpoint - 97 o F geometry = horizontal pipe Insulation Thickness in Inches Necessary to Prevent Condensation or Limit Heat Gain to 8 BTU/hr-ft 2 , whichever is greater Service Temperature ( o F) Nominal Pipe Size -100 -80 -60 -40 -20 0 20 40 0.5 2 2 2 1.5 1.5 1.5 1.5 1 0.75 2.5 2 2 2 1.5 1.5 1.5 1 1 2.5 2 2 2 1.5 1.5 1.5 1 1.25 2.5 2.5 2.5 2 1.5 1.5 1.5 1.5 1.5 2.5 2 2 2 2 1.5 1.5 1 2 2.5 2.5 2.5 2 2 1.5 1.5 1.5 2.5 2.5 2.5 2 2 1.5 1.5 1.5 1.5 3 3 2.5 2.5 2.5 2 2 1.5 1.5 4 3 3 2.5 2.5 2 2 1.5 1.5 5 3 3 2.5 2.5 2.5 2 1.5 1.5 6 3.5 3 3 2.5 2.5 2 2 1.5 8 3.5 3.5 3 2.5 2.5 2 2 1.5 10 4 3.5 3.5 3 2.5 2 2 1.5 12 4 4 3.5 3 2.5 2.5 2 1.5 14 4.5 4 3.5 3.5 3 2.5 2 1.5 16 4.5 4 4 3.5 3 2.5 2 2 18 4.5 4.5 4 3.5 3 2.5 2.5 2 20 5 4.5 4 3.5 3 3 2.5 2 24 5 4.5 4.5 4 3.5 3 2.5 2 28 5.5 5 4.5 4 3.5 3 2.5 2 30 5.5 5 4.5 4 3.5 3 2.5 2 36 5.5 5 4.5 4 3.5 3 2.5 2 This table is based on the ASTM C 680 algorithm for thickness of insulation required to control condensation on the outer surface of an insulated pipe, as used in the NAIMA 3E PLUS program. The required insulation thickness values do not include a safety factor. Actual operating conditions can vary. Consult a design engineer for an appropriate safety factor. This chart was developed with a K factor of 0.200 BTU/in-hr-ft 2 -F at 180 days at 75F mean temperature.

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