In the previous period, PP-c pipes and fittings appeared in the domestic market, and their installation methods were consistent with pp-r. Many people don't know the difference between PP-R and PP-c, resulting in many misunderstandings and confusion. In the international standard, polypropylene cold and hot water pipes are divided into pp-h, PP-B and PP-R, without pp-c. The difference between the three PP pipes is that the stiffness of pp-h, PP-B and PP-R pipes decreases in turn, and the impact strength increases in turn.
Among the three kinds of PP pipes, the impact resistance of pipes is PP-R > PP-B > pp-h, the thermal deformation temperature of pipes is pp-h > PP-B > PP-R, the rigidity of pipes is pp-h > PP-B > PP-R, the bursting temperature of pipes at room temperature is pp-h > PP-B and PP-R, and the chemical corrosion resistance of pipes is pp-h >PP{0}}B va pp-r. Boshqa PP quvurlari bilan solishtirganda, PP{2}}R quvurining ajoyib afzalligi shundaki, u nafaqat pp-soatning past-haroratning mo'rtligini yaxshilaydi, balki yaxshi uzoq{{5} }}yuqori haroratda (6{26}} daraja suv bosimiga chidamlilik), ayniqsa issiq suv quvurlari uchun foydalanilganda, uzoq{7}}muddatli quvvat pp-soat va pp{{ dan yaxshiroq. 9}} b. Bozordagi 1 ta PP{11}}c quvuri aslida PP-B trubkasi bo‘lib, uning xomashyosi blokli kopolimerlangan polipropilen quvur uchun maxsus materialdir. PP-B trubkasi sovuq va issiq suv quvurining bir turi boʻlib, u nisbatan arzon boʻlib, uning issiqlikka chidamliligi va bosimga chidamliligi pp-r.dan juda farq qiladi. Masalan, xizmat ko'rsatish shartlari 2, dizayn bosimi 0,6MPa, dn25 mm trubaning devor qalinligi, PP-R trubkasi 3,5 mm va devor qalinligi PP-B ( PP-c) quvur 5,1 mm; Dizayn bosimi 0,8MPa, dn25 mm, PP-R quvurining devor qalinligi 4,2 mm va PP-B (PP-c) dan foydalanish mumkin emas. Kerakli devor qalinligi juda qalin bo'lgani uchun. Bozordagi PP{35}}R bilan bir xil tuzilish va o‘lchamdagi PP-c quvurining xizmat ko‘rsatish shartlari ancha past va uni PP-R trubkasi bilan aralashtirib bo‘lmaydi, PPni almashtirish ham mumkin emas. {37}}Xizmat shartlarini aniqlagandan keyin PP-c quvurli R trubkasi. Xizmat ko'rsatish holati 2 suvni isitish uchun dizayn harorati 70 daraja ekanligini ko'rsatadi.
