8 1 2015 INT CASAFLEX district heating pipe CFL Subject to technical changes 4 530 Shaft structures Entry into building Planning and engineering of shaft structures The construction and maintenance of shaft structures in local and district heating networks is usually very expensive and time consuming They must include inbound and outbound ventilation and must be built so that they are watertight any surface water which penetrates should be removed as quickly as possible so as to prevent damage to the shaft installa tions and the heat insulation for the inbound pipes insulated steel pipes and flexible district heating pipes Depending on local conditions the pipe entries must be fitted with seals For surface water which does not exert pres sure simple labyrinth seals are usually adequate For groundwater an adjustable packing seal is generally required As a rule the pipe end seals are only designed to protect against water splashes A design which is impermeable to surface water is also possible in principle but flooding of lengthy duration especially below operating temperature should be avoided Due to these requirements little use is made of shaft constructions nowadays Instead pre insulated T pieces and if necessary pre insulated shut off and drainage venting fittings are used This makes it possible to avoid the substantial costs of producing and maintaining shaft constructions and to increase the operational reliability of the system Do not immerse in water Do not use in wet situations

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