According to DL/T 5072—2007 Specification for Design of Insulation and Painting in Thermal Power Plant

the variations of economical thickness for pipe insulation was analysed

with the economic parameter changing

and the main steam and feed-water pipeline of an ultra-supercritical 1000 MW unit was taken as an example.Results show that thermal economy and piping layout can both be considered when the heat price is between $15 and $25.Impact of the yearly apportion rate S of thermal insulation investment loan on the economical thickness of insulation layer design will be reduced if the interest period are selected as 5 years.