8 1 2015 BRG PREMANT district heating pipe PRE Subject to technical changes 6 304 Elbow pipe Elbow pipes are plastic casing pipes made to customer specifications and pre insulated at the factory Elbow pipes are produced as curved plastic casing pipes with a large radius and serve to optimise pipe routing when the direction changes Elbow pipes behave in the same way as straight pipes in other words heat expansion does not cause any bending mo ment The deflection angle a of the pipe routing or the bend radius R must be known in order to produce elbow pipes All elbow pipes have straight ends between 1 2 and 2 0 m due to machine based production The PUR foam is subject to lateral pressure as a consequence of heat expansion and the curve of the pipe The magnitu de of this pressure must not exceed the permissible force of 0 15 MPa The outcome of this is a maximum permissible deflection angle a or a minimum bend radius R The permissible values are contained in the following table Deflection angle for elbow pipes Nominal width DN 40 50 65 80 100 125 150 200 250 300 350 Deflection angle bar 12 m a min 10 8 5 4 4 3 3 3 3 3 3 perm radius R min m 16 4 18 1 19 1 20 2 20 8 23 7 28 6 34 4 38 2 62 5 69 0 DS1 and DS2 only DS1 only perm radius a max 42 38 36 34 33 29 24 20 18 11 10

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