A short answer, followed by the source guide and related questions.
There is no reliable percentage that applies to every plant. Use meter data, operating hours and equipment measurements to establish a baseline. The calculator provides a screening scenario only and does not replace an energy audit.
This answer is taken from Assess Industrial Decarbonisation Measures. Use the full guide for scope, assumptions and cited sources.
Use measured surface area, temperature and operating hours to calculate heat loss from boilers, kilns, heat exchangers, valves and pipework. Inzonex supplies removable modular insulation for equipment that requires maintenance access.
Do not add a calculated reduction to an emissions report until the reporting boundary, factor, implementation date and verification method have been approved.