VALDuotherm PP-R SDR 7.4 pipe is used for indoor cold and hot water supply installations, as follows:
– Class 1 – hot water 60\u00b0C – PN 8 bar; design temperature related to service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours;
– Class 2 (hot water 70\u00b0C) – PN 6 bar; design temperature related to service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours;
– cold water PN 16 bar at c=1.5 and PN 20 bar at c=1.25 (Informative – In accordance with ISO 15874-1 – the design pressure for sanitary cold water installations for a period of 50 years at a temperature of 20\u00b0C is 10 bar).<\/p>\n
The linear expansion coefficient of single-layer PP-R pipes is \u03b1 = 0.15 mm\/m K, which is why the effect of pipe expansion or contraction must be evaluated before wall mounting (surface mounting) of PP-R pipes. Correct installation of clamps or other types of supports and correct positioning of expansion compensators prevents uncontrolled pipe movement due to temperature variations during installation and operation periods. As a rule, installation expansion is compensated between 2 fixed points by changing direction, expansion loop, or where not possible, compensators must be fixed between the pipe and structure. Installation fixing clamps (also called fixed points) are positioned near branches, valves, or wall penetrations, while sliding ones are mounted along the installation route at well-defined distances. This ensures installation alignment, support, and controlled axial displacement. When installing PP-R pipes in screed or wall, they are mounted in protective sleeves with flexible structure, good insulators and capable of absorbing pipe expansion. In case of excessive expansion difficult to compensate through the insulating protective sleeve, an expansion compensator must be calculated and installed. Attention, pipes must be installed at an acceptable depth under the screed or inside the wall to avoid cracks; in addition, excessive internal stresses from joints must be avoided. Installation depth must be greater than or equal to 1.5 \u00d7 pipe outer diameter. Threaded joints are not accepted in screed or wall. Pressure testing is performed before final burial of the pipe\/installation. <\/p>\n
The technical manual covers methods for evaluating expansion and ways to compensate for it, including clamp positioning.<\/p>\n","protected":false},"excerpt":{"rendered":"
For indoor cold and hot water supply installations, as follows: – Class 1 (hot water 60\u00b0C) – design temperature related to service life: 60\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. – Class 2 (hot water 70\u00b0C) – design temperature related to service life: 70\u00b0C\/49 years + 80\u00b0C\/1 year + 95\u00b0C\/100 hours. <\/p>\n","protected":false},"featured_media":97206,"template":"","meta":{"inline_featured_image":false,"wds_primary_product_brand":0,"wds_primary_product_cat":0},"product_brand":[],"product_cat":[8059],"product_tag":[],"class_list":{"0":"post-129321","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-gray-ppr-pressure-pipes","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"yoast_head":"\n