VALDuotherm PP-R/PP-R+GF/PP-R SDR 7.4 pipes are used for internal cold water supply, hot water, and heating installations, as follows:
- Class 1 - hot water 60°C – PN8 bar; design temperature based on service life: 60°C/49 years + 80°C/1 year + 95°C/100 hours;
- Class 2 (hot water 70°C) - PN 6 bar; design temperature based on service life: 70°C/49 years + 80°C/1 year + 95°C/100 hours;
- Class 5 (heating systems including high-temperature radiators) - PN 6 bar; design temperature based on service life: 20°C/14 years + 60°C/25 years + 80°C/10 years + 90°C/1 year +100°C/100 hours;
- Cold water PN 16 bar at c=1.5 and PN 20 bar at c=1.25 (Informative - In accordance with SR EN ISO 21003-1 - the design pressure for domestic cold water installations for a period of 50 years at a temperature of 20 °C is 10 bar).

Reference Standard: SR EN ISO 21003-2 - Multilayer piping systems for hot and cold water installations inside buildings, Part 2: Pipes

The linear expansion coefficient of PP-R/PP-R+GF/PP-R pipes is α = 0.045 mm/m K, which is why the effect of pipe expansion or contraction must be evaluated before wall mounting (exposed installation) of PP-R/PP-R+GF/PP-R pipes. Correct installation of clamps or other types of supports and proper positioning of expansion compensators prevents uncontrolled pipe movement due to temperature variations during installation and operation. As a rule, installation expansion is compensated between 2 fixed points by changing direction, using an expansion loop, or where not possible, compensators must be fixed between the pipe and the structure. Fixing clamps (also called fixed points) of the installation are positioned near branches, valves, or wall penetrations, while sliding clamps are installed along the installation route at well-defined distances. This ensures installation alignment, support, and controlled axial movement. When installing fiber-reinforced PP-R pipes in screed or walls, they must be placed in protective tubes with a flexible, well-insulating structure capable of absorbing pipe expansion. In case of excessive expansion that is difficult to compensate with the insulating protective tube, an expansion compensator must be calculated and installed. Please note, pipes must be installed at an acceptable depth under the screed or inside the wall to avoid cracks; additionally, excessive internal stresses at joints must be avoided. The installation depth must be greater than or equal to 1.5 × the outer diameter of the tube. Threaded joints are not permitted in screed or walls. The pressure test is performed before the final embedding of the tube/installation.
The technical manual addresses methods for evaluating expansion and ways to compensate for it, including clamp positioning.

Ambalare	PLASTIC BAG
Culoare	GRI
Material	PPR
Tip articol	TEAVA
UM colete	BAG
Tara origine preferentiala	EU
Cod CPV	CPV 44115200-1
Lungime	3 m
SDR	7,4
Cantitate colet	10
Diametru	40
Diametru(mm)
Durata estimata de viata	50 Years
Perioada garantie	60 Months
Cod vamal	39172210
Subclasa	PRESSURE PIPES PPR GRAY WITH FIBER