Outer diameter of the pipe after insulation installation
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By adding 50 mm of insulation material to seamless steel pipes of various specifications, by how much can their outer diameter increase? Is there any standard or reference table available? Thank you. Also, do the pipes in the workshop’s circulating water system need insulation?
100mm I guess; circulating water shouldn’t be needed
It can be considered as 100, but there are also the protective layer outside the insulation layer and the bundling materials. It is advisable to insulate the bypass pipe for circulating water; insulation is not necessary for those located indoors.
100mm, right? As long as it’s a insulation layer, unless it’s a fiberglass one, the surface of such insulation layers is elastic; so an additional 100mm is added to the original pipe diameter
It increases by about 100mm; generally, people calculate it themselves as there is no reference table. Indoor circulating water is not required ； For outdoor applications, an analysis is required; generally, the pipe diameter is taken into consideration. Some regulations state that smaller diameters are necessary while larger diameters are not required. This can be discussed with the client’s process team, and it involves costs.
The outer diameter has increased by 100 mm. To illustrate whether insulation is necessary, let me give an example: the temperature of the circulating water in our factory is around 20 degrees. We didn’t install insulation for five or six years, and we managed to get through the winters without problems. This year, however, we encountered extreme weather with temperatures as low as minus 10 degrees, and some of the pipes froze and cracked. I’m from Jiangsu; it depends on the specific region
When winter temperatures drop below zero, the drainage and venting of the outdoor circulating water must be insulated, as well as the auxiliary lines of the control valves; the connection between the inlet and outlet water should be kept slightly open.