The steel carrier pipe meets the requirements of PN-EN 253.
- seamless steel pipes – made of P235GH grade steel with a quality as per PN-EN 10216-1, PN-EN 10216-2
- longitudinally or spirally welded steel pipes – made of P235GH grade steel with a quality as per PN-EN 102017-1, PN-EN 102017-2, PN-EN 102017-5,
- longitudinally welded galvanized steel pipes – made of P235GH or P235TR1, P235TR2 steel grade with a quality as per PN-EN 10217-1, PN-EN 10217-2 and PN-EN 10217-5, and a zinc coating with a quality as per PN-EN 10240
