River terminal cable buyer, Portsmouth docks

Cable on a working dock is a wear item

Bulk transfer is a motion business. A barge unloader travels the length of the dock, its festoon or reeling cable pays out and recovers several hundred feet a day, and the conveyor drives behind it run loaded for twelve hours at a time. The 480 V feeder that supplies the lot runs in a trough or a tray at deck level, in air that is close to saturated for most of the year and carries river silt rather than salt.

That combination produces a specific wear pattern. Flexible cable fails where it bends, at the festoon loop and at the strain relief, and the failure shows as a bulge or a flat spot before it shows as a fault. Static feeder cable fails at the termination or where the jacket has been abraded against the tray edge by vibration. Dock lighting cable fails at the pole, where the drop flexes in wind.

What a terminal actually takes out

Replacements come in windows: a winter shutdown, a conveyor rebuild, a crane inspection that turns into a rewire. The removed material is rarely sorted at the time. It goes into a container on the dock, gets rained on, and is still there when someone thinks about clearing the laydown.

The mix is reasonably predictable. Festoon and reeling cable in the 4 to 12 conductor range, VFD and drive cable from the conveyors, 480 V feeder in 4/0 and 500 kcmil, dock lighting in smaller sizes with direct burial or wet-location jackets, and portable cord from the welders and the small tools.

• Festoon and reeling cable, multi-conductor
• Conveyor drive and VFD cable, shielded
• 480 V feeder, 4/0 to 500 kcmil
• Dock lighting drops and wet-location cable
• Portable cord and welding lead from the dock

Humidity, water and what it does to the review

Water is the deciding condition here, and it usually arrives through the ends. A cable that has hung over a rail with the jacket open wicks moisture along the strand by capillary action, and the corrosion starts inside where nobody can see it until the conductor is cut. Aluminum suffers first and worst; copper goes green and then brittle at the exposed end.

Shielded cable adds a second problem. The copper tape or drain wire in a wet cable corrodes against the insulation screen, and the shield becomes a handling nuisance rather than a recoverable item. On festoon cable, the same moisture gets into the spaces between fine strands, which is where a flexing cable is least able to tolerate it.

Access by barge or by truck

The terminals sit along US-52, with SR-823 as the inland bypass, and most pickups are a truck backed onto a concrete apron with a forklift working from the landward side. Rail and river interchange means the apron is sometimes blocked by a rake of cars or a barge working, so the pickup has to be booked against the terminal's own schedule rather than against ours.

Barge access is real but unusual for scrap cable. Where a terminal has a material handler and a spare deck space, cable can leave by river, which only makes sense for volume. For the ordinary lot, a flatbed and a confirmed window beats any water route.