What is PVC-O Pipe

PVC-O pipes (Biaxially Oriented PVC Pipes) represent an innovative advancement in high-pressure piping systems, engineered through a specialized molecular orientation process that rearranges the polymer structure of PVC-U material along both the circumferential and longitudinal axes. This biaxial orientation enhances the material’s crystalline alignment, resulting in superior tensile strength, impact resistance, and fatigue endurance compared to conventional PVC. As the pinnacle of modern pressure pipe technology, PVC-O pipes deliver exceptional hydraulic efficiency and long-term durability, establishing them as the optimal choice for high-pressure water transmission infrastructure in contemporary engineering applications.

PVC-O Pipes Material Classification

The standard specifies the material classification, overall design coefficient, and nominal pressure for PVC-O pipes. Unlike other materials, PVC-O pipes are categorized into five classes—315, 355, 400, 450, and 500—based on their Minimum Required Strength (MRS). For drainage applications, materials rated below 400 are recommended, while for water supply systems, materials rated at 450 or 500 are preferred.
Higher-grade PVC-O pipes present enhanced material strength and boast higher nominal pressure ratings. When it comes to pipes with the same diameter (DN) and pressure rating (PN), opting for a higher-grade variant leads to more prominent hydraulic capacity, minimized head loss, and decreased overall expenses.

Following the standard requirements and utilizing a comprehensive evaluation method, BEIER PVC-O pipes meet the 500 class certification.

Pipe material classification	315		355		400		450			500
MRS MPa	31.5		35.5		40		45			50
C	1.6	2	1.6	2	1.6	2	1.4	1.6	2	1.4	1.6	2
σs MPa	20	16	22	18	25	20	32	28	23	36	32	25

NO.	Test temperature（℃）	Test time（h）	Hydrostatic stress（MPa）
			PVC-O 315	PVC-O 355	PVC-O 400	PVC-O 450	PVC-O 500
1	20	10	41	46	52	60	65
2	20	1000	36	42	46	53	58
3	60	1000	20	22	25	28	31

Material Mechanical Properties

The following table presents a detailed comparison of the technical features of PVC-O pipes in contrast to those of other varieties of plastic pipes.

		PVC-O500	PVC-U	HDPE 100
Product Standard	units	CJ/T445-2014	GB/T10002.1-2023	GB/T13663.2-2018
Product Standard	units	GB/T41422-2022	GB/T10002.1-2023	GB/T13663.2-2018
Minimum required strength（MRS）	MPa	50	25	10
Overal service coefficient（C）		1.4/1.6	2	1.25
Design stress （σs）	MPa	36/32	12.5	8
Short term elasticity modulus（E）	MPa	≥4000	≥3000	≥1000
Axial tensile strength	MPa	≥48	≥48	19
Circumferential tensile strength	MPa	≥85	≥48	19

O-PVC Pipes Advantage

Unbeatable Impact Resistance

BEIER PVC-O pipes possess outstanding impact resistance capabilities, especially when subjected to cold conditions. Remarkably, their impact resistance performance remains nearly unaltered even under extremely low temperatures, reaching as low as -25℃. This remarkable characteristic not only broadens their applicable scenarios but also prolongs the installation period, providing enhanced flexibility and reliability for various projects.

Crack Propagation

Owing to their reticulated and laminated structure, PVC-HO pipes are highly effective in impeding the proliferation of cracks and scratches. This structural design essentially nullifies the hazard of rapid crack expansion, ensuring enhanced durability and reliability in practical applications.

Fatigue Resistance

Materials may experience a decline in their mechanical properties when exposed to prolonged strain, which is referred to as the phenomenon of creep. PVC-O pipes, however, display an extremely minimal degree of creep behavior. In contrast to traditional plastics, PVC-O pipes possess a remarkably high resistance to fatigue. This characteristic guarantees the pipes’ durability and enables them to operate under nominal pressure for more than a hundred years.

Maximum Flexibility

Owing to their outstanding elasticity, BEIER PVC-O pipes are capable of enduring substantial deformations in their internal diameter. In situations where crushing or mechanical impacts occur, BEIER Blue pipes can promptly revert to their original form, thereby diminishing the potential for damage that may result from soil subsidence or encounters with sharp rocks and machinery.

Low Carbon and Environmental Protection

BEIER PVC-HO Pipes are manufactured with top-notch raw materials and precise formulations, which effectively precludes the utilization of substandard substances. Their inherent and complete corrosion resistance guarantees that the quality of water coursing through the pipes remains unaltered.
Extensive tests carried out by the National Institute of Environmental Health under the Chinese Center for Disease Control and Prevention, in conjunction with the Hebei Health Inspection Institution, have unequivocally verified that BEIER PVC-HO Pipes comply with the hygiene benchmarks stipulated in the “Standard for Safety Evaluation of Equipment and Protective Materials in Drinking Water Systems”.
Beyond their remarkable durability, BEIER PVC-HO Pipes confer notable environmental advantages. They curtail the demand for raw materials, slash energy consumption, and mitigate CO² emissions. As PVC is a 100% recyclable material, it plays a pivotal role in positioning BEIER PVC-HO Pipes as one of the most environmentally amicable and energy-efficient piping solutions presently accessible.

PVC-O Pipe Extrusion Production Line

The PVC-O pipe extrusion line manufactured by Beier Machinery are specially designed for PVC-O pipes. The PVC-O pipe production line is dynamically controlled by the PLC intelligent system to control temperature, pressure, speed and other parameters to ensure the production of high-strength, impact-resistant and long-life PVC-O pipes.

PVC-O Pipe Extrusion Production Line

PVC-O Pipe Application

PVC-O pipes are primarily used for the transportation of potable water, irrigation, water conservancy projects, landscaping, drinking water supply in rural areas, fire protection systems, factories and mines, chemical corrosion prevention, sewage systems, reclaimed water, and more—specifically for conveying high-pressure water.