HDPE pipe and fitting,PVC pipe and fitting

High-density polyethylene (HDPE) pipes have become one of the preferred materials for industrial wastewater treatment systems due to their excellent performance. The main advantages include:

Excellent corrosion resistance: Can withstand various acids, alkalis, salts and organic solvents, suitable for treating industrial wastewater with complex components

Excellent impact resistance: Not easy to crack even in low temperature environments

Good flexibility: Can adapt to a certain degree of foundation settlement

Long service life: Design service life can reach more than 50 years

Smooth inner wall: Small friction coefficient, strong conveying capacity and not easy to scale

Reliable connection: Hot-melt connection forms an integral structure without leakage risk

Environmental protection and safety: The material is non-toxic and does not pollute water quality

 

Specifications of commonly used HDPE pipes for industrial wastewater treatment

1. Pipe diameter specifications

The diameter range of commonly used HDPE pipes in industrial wastewater treatment systems:

Small diameter pipes: DN20-DN200 (used for dosing systems, sampling lines, etc.)

Medium diameter pipes: DN250-DN600 (mainstream process pipelines)

Large diameter pipes: DN600-DN2000 (used for plant main pipelines, discharge pipelines, etc.)

Ultra-large diameter: DN2000 and above (special engineering applications)

2. Pressure level

Select pipes of different pressure levels according to the system working pressure:

PN0.6MPa: low pressure system, such as gravity flow pipelines

PN0.8MPa: general pressure system

PN1.0MPa: medium pressure system

PN1.25MPa: higher pressure system

PN1.6MPa: high pressure system, such as pumping pipelines

3. Wall thickness standard

HDPE pipe wall thickness is usually divided into SDR (standard dimension ratio) series:

SDR11: thick wall pipe, strong pressure bearing capacity

SDR17: medium wall thickness, balanced economy and strength

SDR26: thin wall pipe, used in low pressure system

Specific wall thickness can refer to GB/T 13663.2-2018 standard.

4. Material grade

HDPE pipe produced from PE100 grade raw materials is recommended for industrial wastewater treatment, which has higher long-term hydrostatic strength and crack growth resistance.

 

Specifications of HDPE pipes for special purposes

1. Chemical corrosion resistant pipes

For industrial wastewater containing highly corrosive components, the following should be considered:

Select PE100 RC (stress cracking resistance) material

Increase the wall thickness design margin (reduce the SDR value by one level)

Consider a special anti-corrosion layer for the inner lining (such as PP lining)

2. High-temperature wastewater pipes

When the wastewater temperature exceeds 40°C:

Select high-temperature resistant HDPE material (such as PE-RT)

The pressure level needs to be increased by one level

Consider thermal expansion compensation design

3. Underground buried pipes

Ring stiffness selection: SN8 or above (SN12.5 or above for heavy-load areas)

Consider the outer anti-corrosion layer (such as double-wall corrugated pipe structure)

The relationship between burial depth and load needs to be calculated.

 

Selection of HDPE pipe connection methods

Select the appropriate connection method according to the pipe diameter and engineering requirements:

Hot-melt butt: suitable for DN≥90mm pipes, high connection strength

Electrofusion connection: suitable for various pipe diameters, easy to install

Flange connection: required to connect with metal equipment

Socket connection: commonly used for small-diameter pipes

 

Selection considerations

1. Water quality characteristics analysis: understand wastewater pH value, chemical composition, temperature and other parameters

2. Hydraulic calculation: determine pipe diameter and pressure loss

3. Environmental factors: consider burial conditions, ambient temperature, earthquake level, etc.

4. Standard compliance: ensure that the product complies with standards such as GB/T 13663 and ISO 4427

5. Economic evaluation: balance initial investment and long-term operating costs

 

Correctly selecting HDPE pipe specifications is crucial to the long-term stable operation of industrial wastewater treatment systems. Engineering designers should select the most suitable HDPE pipe specifications based on specific wastewater characteristics, process requirements and site conditions, combined with relevant standards and specifications, while considering the convenience of installation and maintenance and the full life cycle cost, to provide reliable transportation guarantees for wastewater treatment systems.

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