Equipment surface
Record normal and peak values at the surface to be covered. They drive the service limits for the hot face, core, thread and closures.
Thermal performance
What temperature can the cover achieve?
Specify the equipment temperature, the required outcome and the conditions in which you will verify it.
Jacket outer face
Set an outside-surface target with the ambient conditions and measurement points. Include seams, end collars and penetrations where the result matters.
Heat loss or dew point
For hot service, compare heat loss under equal conditions. For cold service, design above dew point and confirm the vapour seal can be restored after servicing.
Dry steam and hot-water reference
Calculated outside-face temperature for Shannon LT450SS at 21.1 °C ambient, flat-surface model. The manufacturer lists a maximum service temperature of 232 °C for this model. The columns show its nominal insulation thicknesses in millimeters and the manufacturer’s approximate inch equivalents.
| Operating temperature | 25 mm (1 in) | 40 mm (1½ in) | 50 mm (2 in) |
|---|---|---|---|
| 121 °C | 37.9 °C | 33.3 °C | 30.8 °C |
| 177 °C | 47.3 °C | 40.3 °C | 36.3 °C |
| 232 °C | 57.2 °C | 47.8 °C | 42.3 °C |
These figures describe the cited manufacturer’s model. Shape, airflow, compression, gaps and closures affect the installed result. A lower outside-face temperature still needs to be checked against your site’s contact and inspection requirements.
Read the manufacturer’s data →Extruder heater-zone reference
Calculated outside-face temperature for Shannon LT550SG at 21.1 °C ambient, flat-surface model. The manufacturer lists a maximum service temperature of 288 °C for this model. The columns show its nominal insulation thicknesses in millimeters and the manufacturer’s approximate inch equivalents.
| Operating temperature | 25 mm (1 in) | 40 mm (1½ in) | 50 mm (2 in) |
|---|---|---|---|
| 232 °C | 57.2 °C | 47.8 °C | 42.3 °C |
| 260 °C | 62.5 °C | 51.7 °C | 45.5 °C |
| 287.8 °C | 67.9 °C | 55.8 °C | 48.9 °C |
These figures describe the cited manufacturer’s model. Shape, airflow, compression, gaps and closures affect the installed result. A lower outside-face temperature still needs to be checked against your site’s contact and inspection requirements.
Read the manufacturer’s data →Hot washdown construction reference
Calculated outside-face temperature for Shannon LT550LFP-FG at 21.1 °C ambient, flat-surface model. The manufacturer lists a maximum service temperature of 288 °C for this model. The columns show its nominal insulation thicknesses in millimeters and the manufacturer’s approximate inch equivalents.
| Operating temperature | 25 mm (1 in) | 40 mm (1½ in) | 50 mm (2 in) |
|---|---|---|---|
| 232 °C | 57.2 °C | 47.8 °C | 42.3 °C |
These figures describe the cited manufacturer’s model. Shape, airflow, compression, gaps and closures affect the installed result. A lower outside-face temperature still needs to be checked against your site’s contact and inspection requirements.
Read the manufacturer’s data →Chilled water · dew-point example
Use the air temperature and relative humidity around the installed fitting. With 7 °C chilled water, the design must keep the coldest exposed jacket surface above the site dew point, with an agreed margin.
This indoor estimate uses the Magnus formula over water. It establishes a surface target. Thickness depends on fitting geometry, conductivity and the vapour-control design. Check seals, stem openings and pipe transitions after refitting.
Armacell condensation-control bulletin · WMO humidity formulaHow to read a heat-loss figure
In U.S. DOE Steam Tip Sheet #17, a 6-inch Class 150 flanged valve at 400 °F (204 °C), with a 1-inch insulating pad, 65 °F (18 °C) ambient and still air, has an estimated heat-loss reduction of 5,800 Btu/h, about 1.70 kW. The estimate applies to the stated valve and conditions.
Read the DOE table and assumptions →Compare your own options
Send equipment dimensions, measured or documented surface temperatures, ambient conditions, operating hours if relevant and the result you want to verify. We can discuss which materials, thicknesses and checks belong in the written quotation.
Discuss your thermal target →Agree an acceptance check before ordering
Record the conditions
Agree equipment temperature, load, ambient conditions and how long the equipment needs to stabilise before comparison.
Mark the inspection points
Choose points on the broad face, near closures and at seams or penetrations. Record whether any exposed part is intentionally outside the cover.
Check after refitting
Compare the same points and conditions after the cover has been removed and refitted. For chilled water, verify the vapour seal and inspect for condensation.