76-660mm ERW Pipe Tunnel Drainage Discharge Carbon Welded Tube

1. Product Overview

Full Product Name

76-660mm ERW Pipe Tunnel Drainage Discharge Carbon Welded Tube

Brief Introduction

This 76–660mm ERW carbon welded pipe is a professional structural steel tube specially developed for tunnel drainage, underground passage water discharge, highway and railway tunnel seepage drainage projects. Adopting high-frequency electric resistance welding (ERW) mature technology, the pipe features uniform wall thickness, high weld compactness, excellent structural stability and strong pressure resistance. It effectively solves tunnel internal seepage, accumulated water and underground water pressure problems, which is the core supporting pipe for tunnel waterproof and drainage engineering.

Made of high-quality carbon steel hot-rolled coils, the product undergoes online weld annealing treatment and full non-destructive testing. It has outstanding compression resistance, anti-deformation performance and good drainage smoothness. It supports customized hot-dip galvanizing, 3PE anti-corrosion coating and inner wall anti-fouling treatment, adapting to long-term humid, buried and complex underground geological environments. Widely applicable for longitudinal drainage, transverse water collection, foundation water discharge and tunnel exterior seepage drainage of mountain tunnels, urban underground tunnels, highway tunnels and railway tunnels.

2. Core Advantages for Tunnel Drainage Engineering

High Weld Compactness, Zero Water Seepage Adopting precision ERW high-frequency welding process, the weld forms metallurgical integration with the pipe body, with dense internal structure and no pores or cracks. 100% online eddy current and ultrasonic testing ensures no hidden leakage risks, perfectly adapting to tunnel long-term underground water seepage discharge requirements and avoiding pipeline water seepage and engineering rework.

Strong External Pressure Resistance, Anti-Deformation for Buried Installation Optimized carbon steel material formula and uniform wall thickness design, with excellent radial compression resistance. It can withstand surrounding rock soil pressure and stratum extrusion after tunnel backfilling, effectively preventing pipeline flattening, bending and blockage, and maintaining long-term stable drainage capacity of the tunnel system.

Smooth Inner Wall, Efficient Drainage & Anti-Blockage The internal weld flash is fully trimmed online, with smooth and flat inner wall, low water flow resistance, fast water discharge speed. It is not easy to adhere sediment, silt and rock powder generated in tunnel construction, reducing pipeline blockage probability and lowering later manual maintenance and dredging costs of tunnel engineering.

Excellent Underground Environment Adaptability The base pipe has stable chemical properties and strong oxidation resistance. Supporting multi-layer anti-corrosion customization, it resists corrosion of underground humid water, weak acid and weak alkali stratum water, adapting to long-term buried dark and humid tunnel working conditions, greatly extending the service life of drainage pipelines.

Precise Size Matching, Fast On-Site Construction Complete specification coverage of 76-660mm, with strict tolerance control of outer diameter and wall thickness. The pipe has good roundness and straightness, which is convenient for on-site cutting, welding, butt joint and hoop fixing. It matches perfectly with tunnel drainage fittings, water collecting tanks and drainage ditches, greatly improving engineering construction efficiency.

Stable Quality & Project Delivery Guarantee Industrial automated production, stable mechanical properties of finished pipes, uniform product consistency. Large inventory of conventional specifications, supporting bulk supply for large-scale tunnel engineering projects, and can meet the urgent delivery needs of key infrastructure projects.

3. Complete Technical Specification Table

4. Professional Manufacturing Process for Tunnel Drainage Pipe

Raw Material Strict Inspection: Select high-purity carbon steel coils with low impurity content, test chemical composition and mechanical properties to ensure the pipe has sufficient compression and impact resistance for underground engineering;

Uncoiling & Precision Levelling: Eliminate coil bending deformation to ensure flat strip feeding and lay a foundation for uniform pipe forming;

Continuous Roll Forming: Multi-pass gradual rolling to ensure uniform pipe roundness and consistent wall thickness, avoiding local stress concentration;

High-Frequency ERW Welding: Precise high-frequency resistance heating and squeeze welding, narrow heat-affected zone, stable weld structure without brittle deformation;

Internal & External Weld Trimming: Completely remove weld burrs to ensure smooth inner wall, guarantee unobstructed tunnel drainage;

Weld Stress Relief Annealing: Eliminate welding residual stress, improve pipe toughness and anti-deformation ability, adapt to stratum extrusion;

Precision Sizing & Straightening: Calibrate pipe diameter, straightness and ovality to meet tunnel engineering installation tolerance standards;

100% NDT Non-Destructive Testing: Full-line ultrasonic and eddy current inspection to eliminate weld defects and hidden leakage dangers;

Hydrostatic Pressure Test: Conduct super-standard water pressure tightness test to ensure no water seepage under long-term water pressure;

Fixed-Length Cutting & End Finishing: Accurate cutting, pipe end deburring and smoothing to facilitate on-site butt joint construction;

Optional Anti-Corrosion Treatment: Customized galvanizing and anti-corrosion coating according to tunnel geological conditions;

Final Inspection & Warehousing: Recheck dimensions, surface and mechanical properties to ensure full compliance with engineering standards.

5. Strict Engineering-Grade Quality Inspection Items

All tunnel drainage ERW pipes are inspected in accordance with infrastructure engineering standards, with complete EN10204 3.1B factory test reports, supporting third-party SGS/BV inspection for project acceptance:

Raw material chemical composition detection to ensure stable steel quality and strong environmental adaptability;

Mechanical performance test: tensile strength, yield strength, elongation and compression resistance test;

Weld performance test: flattening test, bending test and impact test to ensure weld integrity under stratum pressure;

Full online non-destructive weld flaw detection to eliminate micro cracks and trachoma defects;

Hydrostatic tightness test to verify long-term anti-seepage performance of the pipeline;

Precision dimension detection to ensure installation matching degree of tunnel supporting facilities;

Surface quality inspection to ensure no damage affecting pipeline structural strength and anti-corrosion performance.

6. Main Tunnel Engineering Application Scenarios

This 76-660mm ERW carbon welded drainage pipe is widely used in various national infrastructure tunnel drainage and water discharge projects:

Highway & Railway Tunnel: Longitudinal main drainage pipe, transverse water collection pipe, tunnel lining back seepage discharge pipe;

Mountain Tunnel Engineering: Deep-buried tunnel underground water discharge, stratum water pressure relief and sediment water drainage;

Urban Underground Tunnel: Urban traffic tunnel, comprehensive pipe gallery accumulated water discharge and seepage prevention drainage system;

Hydraulic Tunnel Project: Auxiliary drainage and pressure relief pipeline for water conveyance tunnels and culvert projects;

Tunnel Foundation Reinforcement: Foundation dewatering and drainage pipeline for tunnel excavation and backfilling construction;

Underground Passage Engineering: Pedestrian underground passage and underpass tunnel waterproof drainage supporting pipelines.

7. Packing & Construction Delivery Solution

Small & Medium Diameter (76–219mm): Bundled with high-strength steel strips, equipped with plastic end caps to prevent pipe end deformation and sediment entry, wrapped with waterproof and dustproof paper, suitable for container transportation and on-site stacking;

Large Diameter (219–660mm): Bulk loading with rubber cushion isolation between pipes to avoid surface scratch and pipe body deformation, ensuring pipeline roundness for engineering installation;

Engineering Special Packaging: Custom waterproof and moisture-proof packaging for long-distance transportation and outdoor long-term stacking at tunnel construction sites;

Delivery Cycle: 7–15 working days for bulk engineering orders, sufficient spot supply for conventional specifications, supporting emergency supply for key tunnel projects.

8. Factory Strength & Engineering Service Advantages

Professional Engineering Pipe Manufacturer: 12+ years of steel pipe production experience, focusing on infrastructure supporting steel pipes, with targeted production standards for tunnel drainage scenarios;

Stable Engineering Quality: Fully automatic ERW production lines, strict implementation of national and international engineering standards, stable product compression and anti-seepage performance;

Rich Infrastructure Project Experience: Long-term supply for highway, railway and municipal tunnel engineering projects, familiar with project bidding and acceptance standards;

Complete Qualification Certifications: Possess ISO9001 quality system certification, API 5L, CE and other international certifications, complete bidding qualification documents;

One-Stop Engineering Customization: Adjust wall thickness, anti-corrosion grade and pipe size according to tunnel buried depth, geological conditions and water pressure;

Professional After-Sales Support: Provide technical parameter support and installation guidance suggestions for tunnel drainage pipeline engineering.

9. FAQ for Tunnel Drainage ERW Pipe

Q1: Can this pipe adapt to long-term buried tunnel underground environment?

A: Yes. The base pipe has strong structural stability and anti-oxidation performance. Matched with customized anti-corrosion treatment, it can resist underground humid environment and stratum water corrosion, and maintain stable drainage performance for a long time after buried installation.

Q2: Will the pipeline be deformed and blocked by soil pressure after tunnel backfilling?

A: No. Our tunnel-specific drainage pipe adopts thickened wall and optimized steel grade design, with strong radial compression resistance. It can withstand conventional stratum soil pressure, effectively avoiding pipeline flattening and blockage.

Q3: Does the pipe meet national tunnel engineering acceptance standards?

A: Completely compliant. The products are produced and tested in accordance with tunnel infrastructure supporting pipeline standards, with complete test reports and qualification certificates, supporting project bidding and final acceptance.

Q4: Can it discharge sediment-laden water generated during tunnel construction?

A: Yes. The inner wall is smooth without burrs, with low adhesion to sediment and rock powder. It can smoothly discharge construction sewage and sediment-laden water, and is not easy to be blocked, adapting to complex construction working conditions.

Q5: Can you provide customized anti-corrosion solutions for special geological tunnels?

A: Absolutely. According to the tunnel's underground water quality, stratum acidity and alkalinity and buried depth, we can customize hot-dip galvanizing, 3PE external anti-corrosion and other processes to improve pipeline environmental adaptability.

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