Coupling test of press couplings and compression couplings installed on the PE-RT service pipe (Danish Technological Institute): Thermal cycling test of the coupling installed on the PE-RT ser- vice pipe for each pipe dimension. 2000 cycles up to 32 mm and 1000 cycles from 40 mm and bigger dimensions. No leak- age allowed. Oxygen diffusion tightness of the PE-RT service pipe (KIWA): Oxygen diffusion shall not exceed 1,8 mg/m2*day at 80 °C. On the test was measured 0,06 mg/m2*day Water vapor permeation (Danish Technological Institute): We have tested water permeation (mg/m/day) on PE-RT type II SDR 7,4 with an aluminum diffusion barrier and on PEXa SDR 11 at 95 °C. Dimension of pipe 32 mm.
Axial shear strength (Type test, internal): Axial shear strength shall be a minimum of 0,08 MPa.
On the test of PertFlextra, the axial shear strength was meas- ured to 0,22 MPa.
Complete range of products for the PertFlextra system, service pipe dimension 25 – 63 mm PertFlextra is available as single pipe and TwinPipe systems and includes all press couplings, casing joints, fittings, and tools needed to establish a complete pre-insulated piping network.
The dimensions of the service pipe will be 25 – 63 mm, and the casing dimensions will be 90 – 180 mm.
On a PEXa SDR11, water permeation was tested at 367 mg/m/day.
On PE-RT type II SDR 7,4 with an aluminum diffusion barrier, the water permeation was tested to 2,3 mg/m/day, which is considered within the measurement uncertainty. At lower temperatures, the water permeation will be lower. At 75 °C, the water permeation will be approximately 50% lower than at 95 °C. The conclusion is that on plastic service pipes without a water vapor diffusion barrier, there is considerable water permeation, and on PE-RT with an aluminum diffusion barrier, the issue with water permeation is solved. To secure the water vapor diffusion tightness of the entire installed system, couplings shall be wrapped with an alu wrap before installing the casing joint. Please see the below picture:
Further development to meet the full potential of the COOL DH project The reason for not introducing dimensions 75 - 110 mm at the first launch is that during the production of these dimensions for the COOLDH project (Deliveries to Lund) were safety issues for the production employees that should be solved first.
At a later stage, larger dimensions of PertFlextra and electro-fu- sion couplings will be introduced.
Linear water tightness (Type test, internal): The requirement is that the amount of water leaking through any of the pipe ends shall not exceed 100g after 168 hours.
For further information please contact: Peter Jorsal, Peter.Jorsal@kingspan.com
On the test of PertFlextra, no water was leaking through the pipe ends after 168 hours.
Made with FlippingBook - Online magazine maker