Polyethylene under the influence of open fire is lit bluish flame without smoke, with lights ignited too slowly. Polypropylene has a high melting point, than polyethylene, and therefore a higher temperature of decomposition. Maximum operating temperature of polypropylene 120 – 140 C, operating pressure at 20 C at 20 bar at 65 C – 10bar. Excelling in heat resistance of polyethylene, polypropylene is inferior to him in frost. Its fragility temperature (frost) ranged from -5 to -15 C.
Depending on the installation of polypropylene used the following types: Expandable, sewn, reinforced with middle layer of fiberglass, laminated, with the inner layer of stainless steel. Specifications of polyethylene pressure pipes pipes are made of high density polyethylene and polyethylene low density. Produce the following data types of tubes: A light – a maximum operating pressure of 2.5 kgf/cm2, srednelegkogo ca – 4 kgf/cm2; middle C – at 6 kgf/cm2; Heavy T – 10 kgf/cm2. Working pressure specified in the Transportation of water 20 C. Tubes of pvp and the tng with a diameter of 20 mm or more are delivered in lengths 6, 8, 10 and 12 m. Delivery of pipes up 5.5 and 11.5 m and in coils (tubes of diameter pvp 40 mm and the diameter of the pnp to 63 mm inclusive), with outer diameter of the bay must not exceed 3 m.
Pipes normalized by od. When you change the wall thickness depending on the operating pressure is changing the inner diameter. This allows us to unify the connection parts for pipelines. Specifications of polyethylene non-pressure (sewer) pipes Free-flow (sewer) pipes are manufactured by injection molding. Polyethylene non-pressure pipes manufactured from 32mm diameter up to 1200mm. in two flavors: free-flow smooth and non-pressure plastic pipe corrugated pipe. Installation of non-pressure sewer systems is carried out if there is no pumping station or installation is not possible, and sewage water drains without the use of additional equipment. As a rule, non-pressure system is used when installing drainage, and stormwater. Technical characteristics of polyethylene pressure pipes is produced the following data types of pipes: pressure-free corrugated pipes – PE-COR, PP-COR, Korsis, K2-Kan; corrugated tube non-pressure polyethylene (PE-100) and polypropylene (PP) diameter (DN) 100 – 1600 mm; non-pressurized pipe system Krah – non-pressurized pipes made of polyethylene (PE-100) produced by technology Krah, diameter (DN) 300 – 3600 mm, pvc pipes free-flow system Ribloc, Spirapipe – non-pressure pipes of polyvinyl chloride produced by technology Ribloc, diameter (DN) 100 – 3600 mm. Specifications of polypropylene pipes: polypropylene pipes pilsa – made by Turkish and German standards, the diameter (DN) 16-165 mm. Maximum load is determined by the diameter polypropylene tubes: pn 2,5 – 0,25 (2,5) MPa (Kgf/cm2) pn 4 – 0,4 (4) MPa (kgf/cm2) pn 6 – 0.6 (6) MPa (kgf/cm2) pn 10 – 1,0 (10) MPa (kgf/cm2) pn 16 – 1,6 (16) MPa (kgf/cm2) pn 20 – 2,0 (20) MPa (kgf/cm2) pn 25 – 2,5 (25) MPa (kgf/cm2).