For indoor cold and hot water supply installations, as follows: – Class 1 (hot water 60°C) – design temperature for service life: 60°C/49 years + 80°C/1 year + 95°C/100 hours. – Class 2 (hot water 70°C) – design temperature for service life: 70°C/49 years + 80°C/1 year + 95°C/100 hours. INSTALLATION For PP-R pipes not installed embedded in a protective conduit (where expansion occurs within the conduit) and for large diameter pipes, measures for expansion compensation must be taken from the design phase. PPR pipes have the following expansion coefficient: – PP-R (alpha) = 0.15 mm/m K, – PP-R/FIBER (alpha) = 0.088 mm/m K – PP-R/Al (alpha) = 0.03 mm/m K. For exposed installation, it is necessary to secure the system to prevent uncontrolled pipe movement. Linear expansion is compensated between two fixed points. The fixed points of the system are positioned near branches, valves, or wall penetrations. Fixed points are placed so that expansion forces. The variation in pipe length depending on pipe length and temperature variation is calculated using the following formula: ΔL = α x ΔT x L ΔL = L-Lo ΔT = T – To where: ΔL = total pipe length variation [mm] ΔT = total temperature variation α = linear expansion coefficient, [mm/m K] T = operating temperature To = installation temperature L = pipe length at temperature T, [m] Lo = pipe length at temperature To, [m] Sliding points must be securely fixed to ensure system alignment, support, and axial movement, preventing vibrations and noise transmission. Calculation of the length of an L-type expansion compensator Where Lb = expansion arm length, [mm] d = pipe outer diameter, [mm] ΔL = total pipe length variation [mm] C = dimensionless material constant (C = 30 for PP-R) FP: fixed point. SP: sliding point. Calculation of the U expansion compensator. The U compensator is an assembly of 2 L-type compensators, whose length is calculated with the formula above and the minimum width as follows: Lc = 2 x ΔL + ms, Lc minimum compensator width. ms – safety width = 150 mm