| 25mm Pipe | Electric-resistance welded black steel pipe, 25mm nominal diameter. |
| 32mm Pipe | 32mm ERW black steel pipe for general system runs. |
| 40mm Pipe | 40mm diameter ERW pipe suited for typical mechanical lines. |
| 50mm Pipe | 50mm black steel ERW pipe for moderate flow circuits. |
| 65mm Pipe | 65mm ERW pipe segment for higher capacity branches. |
| 80mm Pipe | 80mm pipe used in stronger/main branch runs. |
| 100mm Pipe | 100mm ERW black pipe for larger supply mains. |
| 150mm Pipe | 150mm steel pipe for major main lines in systems. |
| 200mm Pipe | 200mm high capacity ERW pipe for main distribution. |
| 250mm Pipe | 250mm large bore pipe for heavy-duty supply headers. |
