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Prefabricated SCP-Steel Cased Pipe Planning Thermal insulation selection table (standard) Economic thicknesses of mineral wool make-up pieces for various piping dimensions and operating temperatures. Given details of the ground conditions, lambda values for the soil, average soil temperature, the dimensions of the carrier and casing piping, medium temperature and corresponding insulation thickness, the heat loss of Isobrugg steel-cased piping can be calculated. For larger projects and lengthier transport piping, especially at high operating temperatures, steel-cased piping systems should be operated with permanent vacuum. The insulation thicknesses in the table can then be reduced without affecting heat loss. Page 24
Prefabricated SCP-Steel Cased Pipe Planning Determination of the casing piping dimensions in single-pipe conduits(IR) A ring gap of at least 20 mm is essential to ensure the steel-cased piping can be put together easily. The casing piping in-terior diameter must therefore be at least 40 mm greater than the external diameter of the thermal insulation. This ring gap is also important to the emptying of the casing piping and the rapid evacua-tion and drying of the thermal insulation as well. At the same time, correct casing piping dimensions tallying with the ring gap size permit carrier pipe movement of at least 2 x 20 mm. Expansion greater than this can only be taken up given larger casing piping. Determination of the casing piping dimensions Examble: Carrier pipe dimension = DN 150 (168.3 x 4.0) Carrier pipe temperature = 150 C Insulation thickness per selection table = 70 mm Casing piping dimensions determination: CARRIER PIPING DN 150 = 168 mm Insulation 2 x 70 mm = 140 mm Ring gap 2 x 70 mm = 40 mm = 348 mm Page 25 Casing piping size to select: DN 350. In the event of directional alteration, longitudinal expansion of the carrier piping is restricted with this choice. These dimensions are applicable for expansion take-up of max. +/- 19.8 mm, totalling 39.6 mm, at 50% pre-stress of the carrier piping. This governs the maximal expansion length (space between anchor and expansion compensators). At a temperature of 150 C, the longitudinal expansion factor = 1.88 mm/m. ∆ L total at 50% pre-stress = Total expansion Longitudinal expansion factor = 39.6 mm 1.88 mm/m = 21.07 m. This casing piping size is therefore only suitable for short piping distances.
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