供水系统的管道

Pipes which are commonly used in water supply system are given below.

1. 铸铁（CI）管道
2. steel Pipes
3. Galvanized Iron (GI) Pipes
4. 铜管
5. Plastic or Polythene or PVC pipes
6. 石棉水泥（AC）管道
7. Concrete Pipes

1。铸铁管

These pipes are most commonly used in water distribution system mainly because of the following reasons.

• 他们的成本便宜
• It has high resistance to corrosion
• 它很耐用

C.I.管道是通过以下4种方法制造的。

1. Horizontally cast (MC ware pipes)
2. Vertical cast (pit cast in sand moulds)
3. 以沙线模具离心铸造
4. 离心在水冷却金属模具中

现在是水平铸造C.I.管道不再使用。

离心管具有细砂纸结构和均匀的厚度，因此被广泛使用。

special care has to be taken during transportation and making connection of these pipes, to prevent damage.

2。steel Pipes

Use of steel pipes in water supply system is suggested when,

• pipes are subjected to very high pressure (i.e. above 7 kg/cm2)
• large diameter pipes are required

使用钢管是因为与C.I相比，它们的重量更强，重量更轻。管道。

但是，这些管道需要足够的预防措施来维持不利的大气条件。

当钢管被包裹在水泥砂浆或水泥混凝土中时，它们被称为休ume钢管。

3。Galvanized Iron (GI) Pipes

This type of pipe is used for water supply work inside the building. These pipes are wrought steel pipes provided with zinc coating.

他们是可用的轻型、中型和重型研究生es depending on the thickness of the metal. For a 15 mm GI pipe, the thicknesses are 2.0, 2.65 & 3.25 for the light, medium and heavy grades, respectively. Generally the medium grade pipes are used for internal plumbing in building.

G.I.主要使用螺钉和插座接头。管道。

4。铜管

These pipes are used in hot water installation. They have high tensile strength and can therefore have thin walls and they can be bent easily.

Copper pipes are sometimes coated with chromium to enhance its appearance.

5。Plastic or Polythene or PVC Pipes

These pipes are being used increasingly these days for supply of cold water in external and internal plumbing work.

They are light in weight, non-corrosive, lower in cost and do not require any threading for connections.

如下所述，市场上有3种常见的塑料管道。

• 不形化的PVC（UPVC）或与冷水一起使用的刚性管道
• Plasticized PVC pipes which are plasticized with addition of rubber. It has lower strength and lower working temperature than UPVC pipes.
• 氯化PVC（CPVC）管道可以承受更高温度至120⁰(used to carry hot water)

For pipes used in soil and waste water discharge systems, the thickness of the wall will be larger than that of used for roof drainage.

刚性PVC管用于温度低于45的水的水⁰C。

在较高的温度下，管道的强度降低。类似地，阳光的紫外线辐射以及温度频繁的变化会降低PVC管道的寿命。

These pipes are costlier than AC pipes but cheaper than GI pipes.

6。石棉水泥（AC）管道

这些管道用于从屋顶，土壤和废物以及通风中排出雨水。它们分为两个配置文件 - 一个带有插座周围（WB）的串珠，另一个则无需插入插座（WOB）。后一种类型比前者更普遍。

The pipes come in lengths of 3 meters.

The principal defects of these pipes are that they are heavy and they break easily.

These pipes are cheaper than PVC pipes.

7。Concrete Pipes

小直径以及大型直径的加固和预应力的混凝土管道可用于供水和其他用途。

小型未加固的混凝土管非常用于排水。

Large diameter pipes are generally used for major water supply works.