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News: Disadvantages PPU

Essential disadvantages of PPU insulation:
Essential disadvantages of PPU insulation:

Essential disadvantages of PPU insulation:

- The thermal resistance of PPU insulation does not exceed 130 0С (only a short-term increase of the coolant temperature up to 1500С is allowed). This factor significantly limits the use of PPU insulation in thermal networks operating on temperature graphs of 140 / 700C, 150 / 700C and above. Work on temperature graphs 140 / 700С, 150 / 700С and above, for thermal networks in polyurethane foam insulation is possible only if there is a special heat-insulating layer (thin polymer concrete or anticorrosion coating "Vector-1265") that separates the main layer of PPU insulation and the outer wall pipeline. This technology is called "steel pipe in combined PPU insulation."

- Thermal insulation of polyurethane foam is weak and has a weak resistance to mechanical influences (compressive strength does not exceed 0.3-0.4 MPa and only partially meets the requirements of SNiP 41-03-2003 "Thermal insulation of equipment and pipelines").

- When the foam is wetted, the insulation is destroyed and can have an aggressive corrosive effect on the pipelines. This factor stipulates the mandatory use of a hydro-protective coating (a layer of high-density polyethylene) and a system of operatively remote control (PODC) behind the moistening of polyurethane foam insulation.

- If the foam insulation is damaged and / or humidified, the entire section of the heat network (ie PPC insulation, not repairable-fit) is completely replaced.

- Thermal insulation of polyurethane foam combustible (ie heat-insulating material is fire-hazardous).

- High cost of thermal insulation structures made of polyurethane foam: more than the cost of APB insulation and insulation from mineral wool in 1,2 ... 1,8 times.

- The need for continuous monitoring of the moisture of the polyurethane foam insulation (ie the pipelines of heating networks in polyurethane foam insulation must be equipped with a system of operatively remote monitoring of the humidity of the insulation).

4. При повреждении и/или увлажнении ППУ изоляции, полностью заменяется весь участок тепловой сети (т.е. ППУ изоляция, не ремонтно-пригодна).

5. Тепловая изоляция из пенополиуретана горюча (т.е. теплоизоляционный материал пожароопасный).

6. Высокая стоимость теплоизоляционных конструкций из пенополиуретана: больше стоимости АПБ изоляции и изоляции из минеральной ваты в 1,2…1,8 раз.

7. Необходимость постоянного мониторинга влажности ППУ изоляции (т.е. трубопроводы тепловых сетей в ППУ изоляции должна быть оснащена системой оперативно дистанционного контроля влажности изоляции).

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