Double renovation by liner in liner
Following renovation of a pipeline in Host Pipe Condition II (HPC II) using hose lining, it was found that the actual external water pressure will be significantly higher than the specified value.
The renovated object had to be renovated again.
Principle sketch: Grey – host pipe, green – outer liner, yellow – inner liner
The advanced statics system now consists of an old pipe and two liners. The host pipe and the liners on the host pipe as well as the two liners within one another may transmit only pressure forces, but no tensile and shear forces. The outer liner was assumed to be leak-proof.
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