Steel electric-welded longitudinal pipe of large diameter 426 mm with a 7 mm wall to GOST 10704-91, made of St3sp/St20 steel. Used in pressurized and gravity sewerage and stormwater drainage systems, as well as for the installation of technical pipelines under road and railway routes, where increased mechanical strength and resistance to external loads are required. Supplied with external polyethylene anti-corrosion insulation and internal cement-sand coating on customer request.
Technical specifications
| Standard | 10704-91 |
| Diameter (mm) | 426 |
| Wall thickness (mm) | 7 |
| Steel grade | Ст3сп / Ст20 |
| Length (m) | 10-12 |
| Coating | on request — external polyethylene VUS insulation, internal cement-sand lining |