Double Wall Bellow Purchase Recommendations

Double Wall Bellow Purchase Recommendations

The selection of double-wall corrugated pipe requires comprehensive consideration of a number of aspects, the following are some key points:

Pipe material

- HDPE (high-density polyethylene): high strength, stiffness and corrosion resistance, good chemical stability, resistance to a variety of acids, alkalis and salts, suitable for a variety of poor soil and water conditions, and long service life, up to 50 years or more.

- PVC (polyvinyl chloride): good corrosion resistance and insulation, the price is relatively low, but easy to become brittle at low temperatures, impact resistance is relatively poor, and its service life is generally in the 20 years to 30 years or so.

Ring Stiffness Rating

- Ring stiffness is an important index to measure the ability of double-wall bellows to resist external pressure, generally divided into different grades such as SN2, SN4, SN8, SN10, etc., and the larger the number means the higher the ring stiffness. In the high traffic flow, deep soil cover under the road, should be used SN8 and above grade pipe; and in the general community drainage, farm irrigation and other occasions on the ring stiffness requirements are not high, SN2 or SN4 grade pipe can meet the requirements.

Pipe specifications

- Inner diameter: according to the actual flow rate to determine, general drainage projects, the common inner diameter of 300mm, 400mm, 500mm, etc., in the selection of the relevant hydraulic calculation manual, to ensure that the pipeline can meet the requirements of drainage or transportation of fluids.

- Length: The common single length of double-wall corrugated pipe is 6 meters, and there are also customized longer or shorter pipes. If the construction site permits, try to choose a longer pipe, which can reduce the number of connections, reduce the risk of leakage and improve construction efficiency.

Connection method

- Socket connection: easy to operate, fast construction speed, suitable for small diameter pipe, but its sealing performance is relatively poor, the construction quality requirements are higher, need to ensure that the depth of the socket and the installation quality of the sealing ring.

- Heat shrinkable sleeve connection: solid connection, good sealing performance, applicable to a variety of caliber pipe, but requires professional heating equipment, construction is relatively complex, high cost.

- Haff joint connection: mainly used for pipeline repair and temporary connection, easy and quick installation, but the long-term stability is relatively poor, generally used as an emergency measure.

Quality Inspection

- Appearance inspection: the inner and outer walls of the pipe should be smooth, flat, without bubbles, cracks, depressions and other defects, and the color is uniform. If there are obvious defects on the surface of the pipe, it may affect its performance and service life.

- Dimension Measurement: Use calipers and other tools to measure the inner diameter, outer diameter, wall thickness and other dimensions of the pipe to ensure that it meets national standards and design requirements.

- Performance test: Check the test report of the pipe's ring stiffness, ring flexibility, impact resistance, etc. Qualified pipes should have good mechanical properties and resistance to deformation, and be able to withstand certain external pressure and impact.

Brand and price

- Brand: well-known brands are usually more secure in product quality, production processes, after-sales service, etc., through the network, industry forums and other channels to understand the brand's reputation and credibility.

- Price: price is one of the factors to consider when choosing double-wall corrugated pipe, but should not just price as the only selection criteria. Generally speaking, the price of better quality HDPE double wall corrugated pipe is relatively high, while the price of PVC double wall corrugated pipe is relatively low.