Japan Osaka Urban Geothermal Heating Network Seamless Pipe Project

Project Overview

This key civil engineering project realizes comprehensive geothermal energy utilization in Osaka metropolitan area. The distributed central heating pipeline supplies heating hot water for commercial zones and residential communities. Japanese infrastructure implements strict JIS industrial standards, requiring excellent high-temperature resistance, stable weldability, inner surface cleanliness and anti-creep property. After sample evaluation and on-site factory audit by Japanese technical team, Pengyuan Steel was selected as designated supplier of seamless heating pipes.

Project Challenges

1. Long-term transportation of geothermal hot water at 80~120℃, pipes need reliable high-temperature performance to avoid deformation;

2. Narrow construction space under urban roads, requiring precise dimensional tolerance for prefabricated welding;

3. Comply with JIS G3454 standard, bilingual Japanese & English inspection documents are mandatory;

4. Multi-stage random inspection implemented, full traceability from raw material to finished pipes, zero tolerance for serious defects.

Supplied Products

Product: STPG370 seamless steel pipes for high-temperature heating serviceSize: OD139.8mm～OD355.6mm, wall thickness 6.6mm~14.2mmTotal quantity: 1,140 metric tonsStandards: JIS G3454, GB/T8163

Pengyuan Solution

1. High-quality carbon steel billets adopted. Strict rolling control reduces inclusions and improves structural stability under high temperature;

2. Inner and outer surface cleaning removes scale, preventing scaling and blockage inside circulation pipelines;

3. Every pipe undergoes hydrostatic test and ultrasonic inspection, dimensions strictly meet JIS tolerance requirements;

4. Goods delivered in four batches by container sea shipment to match prefabrication schedule;

5. Bilingual Japanese & English MTC, NDT reports and heat treatment records provided to support witnessed third-party inspection.

Project Result

All seamless steel pipes arrived at Osaka Port on schedule and passed joint inspection successfully. The geothermal heating pipeline operates steadily without leakage or deformation. Successful delivery helps Pengyuan further expand urban thermal and water engineering market in Japan.