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Maximum service temperature is a measure indicating the maximum continuous temperature at which an insulation material can operate without any degradation in thermal insulation performance.MST is either measured according to:aximum Service Temperature (MST) under 500Pa â a guarantee that can be used for design. To estimate the highest continuous operating temperature at which a product can be used, a variety of methods exists.
Refer to Attachment 3. This is just below the polyethylene pipe maximum pipe service temperature of 60 ÂºC, so the design would be allowed. However, an FEA of this design shows that the actual pipe wall temperature under the heat tracer is only 29 ÂºC, which is well below the maximum pipe service tem-perature rating.