Supplying Large-Diameter Anti-Corrosive Steel Piping Systems for Ho Chi Minh City’s Drainage and Sewage Upgrade

Project Overview

Location: Ho Chi Minh City, Vietnam
Client: HCMC Urban Drainage Company and Municipal Contractors.
Products Supplied: Large-Diameter SSAW Steel Pipes with External 3PE and Internal Epoxy Coating.
Supply Scope: Mainline networks (DN1200-DN2000), totaling over 12,000 meters.

The Challenges

As rapid urbanization strains the existing infrastructure, the new upgrade project faced several hurdles:

Soft Soil & Ground Subsidence: Situated in the Mekong Delta, HCMC has soft soil conditions. Pipes must have high structural integrity to resist fractures caused by uneven settlement.
High Humidity & Groundwater Corrosion: The long rainy season and acidic groundwater necessitate superior external protection for buried steel assets.
Logistics & On-site Precision: Handling oversized pipes in crowded urban areas is difficult. Ensuring precision in field welding for these massive segments was a top priority for the contractor.

Our Detailed Solution

To address these specific municipal engineering needs, we provided a comprehensive supply and support package:

A. Advanced 3PE Coating Technology

We applied a 3-layer Polyethylene (3PE) coating, combining the adhesion of epoxy powder, the bonding of adhesive, and the impact resistance of PE. This ensures a design life of over 50 years in permanently damp underground environments.

B. Reliable SSAW Welding Process

Utilizing automated submerged arc welding, every weld seam underwent 100% Ultrasonic and In-line X-ray testing. The structural nature of SSAW pipes provides superior resistance to hoop stress, protecting against compression in soft soils.

C. Precision Beveling & End Protection

To expedite on-site work, we performed factory-precision beveling, ensuring millimetric accuracy for field joints. Reinforced steel rings were installed on all pipe ends to prevent deformation (out-of-roundness) during international shipping.

D. On-site Technical Assistance

Our technical team was deployed to the site in HCMC to provide guidance on welding procedures and joint-coating (field-wrap) techniques, ensuring 100% anti-corrosive continuity for the entire network.

Results & Customer Value

The system is now operational, proving its value during recent heavy monsoons:

Flood Mitigation: The large-diameter trunk lines significantly increased peak flow capacity, reducing flood drainage time in surrounding areas by 40%.
Zero-Maintenance Integrity: Hydrostatic testing upon completion showed 100% stability across the network, with zero defects in the coating integrity.
Cost-Effective “China Solution”: We delivered international-standard quality while saving the client approximately 15% in material costs through optimized supply chain management.

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