8 1 2015 INT CASAFLEX district heating pipe CFL Subject to technical changes Construction work 4 535 The static equilibrium of the CASAFLEX district heating pipe must be maintained during construction work see the open trench lengths L stipulated in the table If greater lengths have to be left unsupported sand supports must be posi tioned at the intervals indicated T pieces must be separately fixed by means of sand supports In case of open digging parallel with the CASAFLEX pipe route distance A must be respected Where other trenches are parallel to the CASAFLEX route the distance A must be maintained Type L L L L L A 6 bar 10 bar 16 bar 21 bar 25 bar m m m m m m DN 20 6 4 3 2 2 0 5 DN 25 6 4 3 2 2 0 5 DN 32 6 4 3 2 2 0 5 DN 40 5 4 3 2 2 0 5 DN 50 5 4 3 2 2 0 5 DN 65 5 4 3 2 2 0 6 DN 80 5 4 3 2 2 0 6 DN 100 5 4 3 2 2 0 6 Sand support dimensions Hs 2 x Da Bs 7 x Da Ls 4 x Da Ground layout plan Open trench length L Ls 4 Da Sand support A A Open trench lengths B s 7 D a Da Trench profile Sand support A A Bs 7 Da Hs 2 Da A Open trench length L

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