PVC pipe (polyvinyl chloride pipe) is a common plastic pipe material, which has been widely used in construction, water supply and drainage, sewage, power, electrical and other industries. PVC pipes of different specifications have different application scenarios in the market. Among them, DR 18 PVC pipe has important application value in many fields due to its excellent mechanical properties and corrosion resistance. This article will discuss in detail the DR 18 pvc pipe pressure rating, specification characteristics and its application advantages in actual engineering.
Definition of pressure rating
The pressure rating of PVC pipe usually refers to the maximum internal pressure that the pipe can withstand under certain working conditions. The pressure rating is usually measured in “PN” (Nominal Pressure), which indicates the maximum pressure at which the pipe can work stably for a long time under specific conditions. The unit is usually MPa or Bar.
For DR 18 PVC pipe, the pressure rating is generally low and is suitable for low to medium pressure pipeline systems such as water supply and drainage. The specific pressure rating usually depends on the size (outer diameter) of the pipe and the PVC raw materials and production process used. Different standards and specifications (such as ASTM, ISO, etc.) may also have different definitions of pressure rating.
DR 18 pvc pipe pressure rating
DR 18 pvc pipe pressure rating is usually applicable to systems with a nominal pressure of **0.6 MPa (6 bar)**. This means that this pipe can withstand a maximum internal water pressure of 0.6 MPa in long-term operation. For some specific markets or regions, there may be slight differences, but generally the DR 18 PVC pipe pressure rating is 0.6 MPa.
For example, according to ISO 4422, ASTM D2241 and other specifications, the common DR 18 PVC pipe pressure rating table usually lists the following information (for reference only):
Outer diameter 50 mm: pressure rating 0.6 MPa (6 bar)
Outer diameter 63 mm: pressure rating 0.6 MPa (6 bar)
Outer diameter 110 mm: pressure rating 0.6 MPa (6 bar)
Outer diameter 160 mm: pressure rating 0.6 MPa (6 bar)
Outer diameter 200 mm: pressure rating 0.6 MPa (6 bar)
Outer diameter 250 mm: pressure rating 0.6 MPa (6 bar)
Outer diameter 315 mm: pressure rating 0.6 MPa (6 bar)
Specification definition of DR 18 pvc pipe
In the standard of PVC pipes, “DR” is the abbreviation of “Dimension Ratio”. DR stands for the ratio between the outer diameter and the wall thickness of the pipe, and “18” indicates that the pipe has a dimension ratio of 18. Specifically, the outer diameter of a DR 18 PVC pipe has a ratio of 18:1, which means that the outer diameter of the pipe is 18 times its wall thickness. The dimension ratio (DR value) reflects the pressure bearing capacity and structural strength of the pipe. DR 18 PVC pipes are relatively light and suitable for some low-pressure or non-high-pressure applications.
For example, common specifications of DR 18 PVC pipes may include:
Outer diameter: ranging from 32mm to 400mm.
Wall thickness: Depending on the outer diameter, the wall thickness is adjusted accordingly to maintain a dimension ratio of 18:1.
Length: Usually 6 meters per pipe, and some suppliers also provide customized lengths.
These specifications comply with relevant national standards and industry specifications, such as China’s GB/T 10002.1-2006 standard and the US ASTM standard.
Physical properties of DR 18 PVC pipes
The physical properties of DR 18 PVC pipes are mainly reflected in the following aspects:
1. Pressure resistance: Due to its moderate size ratio, the wall thickness of DR 18 PVC pipes is moderate, with a certain compressive strength, and can withstand high internal pressure. It is suitable for low to medium pressure water supply, drainage and other systems. Its pressure resistance can usually meet the needs of most residential, commercial and municipal projects.
2. Corrosion resistance: PVC pipes have excellent corrosion resistance and can resist the erosion of most chemicals without rusting or corroding. This feature makes DR 18 PVC pipes very suitable for use in some highly corrosive environments, such as chemical transportation, water treatment plants, agricultural irrigation, etc.
3. Weather resistance: PVC pipes have strong UV resistance and will not age significantly after long-term exposure to sunlight. They are suitable for outdoor or open-air environments.
4. Flame retardancy: PVC itself has certain flame retardant properties, so when a fire occurs, PVC pipes have a lower fire risk than some metal pipes. Nevertheless, in some places that require higher fire protection standards, it is still necessary to choose more suitable pipes according to specific standards and needs.
5. Lightness: Due to the low density of PVC pipes, DR 18 PVC pipes are lighter than similar metal pipes, which can reduce the difficulty of transportation and installation during construction, and reduce labor and machinery costs.
Application characteristics
DR 18 PVC pipes are widely used in many fields due to their relatively balanced performance. The specific application characteristics are as follows:
1. Water supply and drainage system: DR 18 PVC pipes are often used in urban tap water networks and water supply pipes in buildings. Due to their excellent corrosion resistance and pressure resistance, these pipes can operate stably for a long time and will not be affected by water quality and environmental factors. DR 18 PVC pipes are suitable for medium and low pressure water supply systems in municipal and construction industries.
2. Sewage discharge: DR 18 PVC pipes are also widely used in drainage systems, especially in sewage discharge, rainwater pipes and other fields. The anti-corrosion properties of PVC pipes ensure that they can be used for a long time in harsh chemical environments without being damaged by water quality deterioration or external factors.
3. Power cable protection: In the power industry, PVC electrical conduit pipe is often used as a protective pipe for power cables. Power cables usually need to be laid underground. The use of DR 18 PVC pipe can effectively protect the cables from external damage and reduce cable failures caused by external pressure or corrosion.
4. Agricultural irrigation: In the agricultural field, PVC irrigation pipes are often used in irrigation pipe systems due to their good corrosion resistance and strong weather resistance. DR 18 PVC pipes are light and easy to install, which can ensure smooth water flow and meet the irrigation needs of large areas of farmland.
5. Chemical industry and wastewater treatment: Due to the good corrosion resistance of PVC pipes to chemical substances, DR 18 PVC pipes have been widely used in the chemical industry, especially in wastewater treatment systems. It can resist corrosion from a variety of chemicals and is particularly suitable for transporting acid, alkali liquids and other corrosive substances.
6. Underground pipelines: Due to its high pressure resistance, DR 18 PVC pipes are often used in underground pipeline systems. Whether laying pipes under urban roads or in areas with poor geological conditions, DR 18 PVC pipes can provide long-term and stable service.
Installation and Maintenance
DR 18 PVC pipes are easy to install and are usually connected by gluing, welding or electric welding. These connection methods are not only convenient for construction, but also can ensure the sealing and anti-permeability of the pipes after connection. In terms of daily maintenance, the corrosion resistance of PVC pipes makes its maintenance requirements relatively small, and usually only the sealing and patency of the pipes need to be checked regularly.
DR 18 PVC pipes are widely used in water supply and drainage, sewage treatment, agricultural irrigation, power cable protection and other fields due to their excellent physical properties, corrosion resistance and weather resistance. Its specifications are moderate, which can not only meet certain pressure requirements, but also have good construction and maintenance advantages. With the advancement of urbanization and the increasing demand for infrastructure construction, DR 18 PVC pipes will continue to play an important role in pipeline systems and become one of the indispensable materials in modern construction and municipal engineering.
