Two poles can look identical on delivery day and behave very differently five years later. The difference lies in checks that are rarely visible to the naked eye. These are the ones worth requiring and verifying.
1. Traceable materials
The starting point is knowing which steel was used. The manufacturer should be able to provide material quality certificates showing the batch identification and its properties. Without that traceability there is no way to confirm the structure meets the specification.
2. Welding
Welding is the critical point of any steel structure. Three things are worth checking: that welders are qualified, that a defined welding procedure exists and that joints are inspected. For steel structures, the AWS D1.1 code is a common reference. Visually, a sound weld bead is uniform and continuous, with no porosity, cracks or undercut.
3. Dimensions and geometry
Before finishing, the piece is checked against the drawings: height, diameters, plate thickness, straightness and, above all, the base plate hole pattern, which must match the foundation anchor bolts. An error of millimeters here becomes a problem on erection day.
4. Coating: thickness and adhesion
The coating, whether hot-dip galvanizing or paint depending on the project, is what protects steel from corrosion. Two simple tests say a lot:
- Dry film thickness. Measured with an electronic gauge at several points and compared with the specified value.
- Adhesion. For paint, the cross-cut test described in standards such as ISO 2409 or ASTM D3359: a grid of cuts is made, tape is applied and the amount of coating removed is assessed.
Tip: ask for measurements to be recorded per piece or per batch. An average value hides the weak spots.
5. Packing, transport and documentation
A good finish can be ruined on the road. Pieces should travel protected at support and tie-down points. With the delivery, ask for the quality dossier: material certificates, weld inspection records and coating measurements.
Quick acceptance checklist
- Steel certificates with batch identification.
- Qualified welders and inspected joints.
- Dimensions and base plate checked against drawings.
- Coating thickness and adhesion measured and recorded.
- Pieces protected in transport and a complete quality dossier.
SEBLAN works under an ISO 9001 quality management system and delivers the documentation for each project. See our credentials on the About Us page and our steel structures and telecom monopoles lines.
About the author. Industrias SEBLAN has manufactured and installed poles, traffic signals and steel structures in Ecuador since 1993, under an ISO 9001 quality management system.