供弯头25

产品特点
多联冷热水用PP-R管材、管件系列产品是参照国家标准GB/T18742-2002生产的，除具有材质轻、强度高、不锈蚀、无结垢、使用寿命长等优良性能外，还具有以下显著特点：
◆独特的低膨胀（收缩）性能
多联冷热水用PP-R管道系统较突出的特点就是成功的解决了PP-R管道热胀冷缩的弱点，热膨胀系数比其它品牌降低1～2倍，将使用中因膨胀（收缩）带来破坏的可能性降至较低。
◆耐热、保温性能好
多联冷热水用PP-R管道系统的导热系数为0.23～0.24w/m?℃，是现有各种管道中较理想的保温节能型管道；热水用PP-R管道可在70℃下长期使用，瞬间使用温度达95℃，一般情况下无需保温措施，完全满足建筑物中供热水的使用要求。
◆卫生环保
多联冷热水用PP-R管道系统的卫生性能符合GB/T17219的要求，卫生、无害，是绿色环保产品。
◆安装、连接简便可靠
管材与管件采用热熔焊接，连接处达分子级结合，管件与用水器连接采用优质铜嵌件，安全可靠。
二、产品主要技术指标
◆外观
多联PP-R系列产品颜色为国家标准规定的浅灰色，也可生产用户要求的其它颜色；内外表面光滑、平整、无凹陷及气泡等缺陷；不透光。
◆规格尺寸
管材平均外径、壁厚及其偏差，管件承口高层度及平均直径均符合GB/T18742-2002的要求。
◆物理力学和化学性能

项目

试验参数

技术指标

试验结果

试验方法

试验温度℃

试验时间h

静液压应力Mpa

管材

管件

纵向回缩率

135+2

en≤8mm:1
8mmen＞16mm:4

---

≤2%

0.37

---

GB6671.3中方法B

简支梁冲击试验

0+2

----

破损率

0

---

GB/T18743

静液压试验

20

1

16

无破损
无渗漏

无渗漏

无渗漏

GB/T6111

95

22

4.2

无渗漏

---

95

165

3.8

无渗漏

---

95

1000

3.5

无渗漏

无渗漏

三、管系列S值选择

应用等级

TD℃

在TD的时间年

Tmax℃

在Tmax的
时间年

Tmal℃

在Tmal的时间h

典型的应用范围

级别1

60

49

80

1

95

100

供应热水（60℃）

级别2

70

49

80

1

95

100

供应热水（60℃）

级别4

20

2.5

70

2.5

100

100

地板采温和低温散热器采暖

40

20

60

25

级别5

20

14

90

1

100

100

高温散热器采暖

60

25

80

10

注：当TD、Tmax和Tmal超出本表所给的值时，不能用本表。TD：设计温度，Tmax：较高设计 温度，Tmal：故障温度。

多联PP-R管用于输送热水是按2级条件考虑，

即在 70℃的高温下长期使用仍具有优良的物理力

学性能。 　
用于输送冷水的PP-R管系列S值选择

公称压力（Mpa）

1.0

1.25

1.6

2.0

2.5

管系列S

5

4

3.2

2.5

2

用于输送热水的PP-R管系列S值选择

使用条件级别

1级

1级

1级

1级

设计压力（Mpa）

管系列S

0.4

5

5

5

4

0.6

5

3.2

5

3.2

0.8

3.2

2.5

4

2

1.0

2.5

2

3.2

---

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