INSTRUCTIONS

(Input information may generally be be obtained from design documents or field measurements)

• Line 1. Select Nominal Pipe Size, NPS
• Line 2. Enter operating (process) temperature
• Line 3. Enter temperature of the air surrounding the pipe
• Line 4. Enter the wind speed of the ambient air (if unknown, use 0 mph for worst case conditions)
• Line 5. Select an insulation material
• Line 6. Select the effective emittance of the exterior surface

Note: Maximum contact times calculated via procedure from ASTM C 1055 (Fig 1, Threshold B- Reversible Epidermal Injury).

Note: Calculator does not screen for material temperature limitations - Use caution.

Note: Note NA = Not Available. Some sizes and thicknesses may not be commercially available and some materials are available in sizes and thicknesses not listed.

ASSUMPTIONS

• One dimensional, steady state heat transfer
• Base structure is a horizontal steel pipe
• Thermal conductivity based on ASTM Specification Values. Refer to the introductory notes for further clarifications.