A marina asset crosses all four bands in one member

Four bands, four clocks, one structure

This page is the schedule, not the part, and settles no dimension of its own. The one span everything is measured against is quoted below, with a link to where it is set out. If your question is really about the concrete element tying a driven pile group into a deck slab, that sense is pulled apart on pile cap or pile capping.

Stand at a finger pontoon on a spring low and one timber pile shows you the whole scale. Its top is in air, taking sun, rain, roosting birds and, north of the frost line, water that gets into a check and freezes overnight. A short way down begins the splash zone, wetted and dried on every tide, which removes material fastest because the surface never settles into being either wet or dry. Below that the member is submerged, losing section to organisms rather than to weather.

The buried band sits on the same asset but not the same member: it turns up at the shore end, in the trench carrying the pontoon feeder and in whatever ground bed the cathodic protection occupies. So four failure clocks run on one structure and a cap reaches only the two at the top. The survey is three columns walked at low water: substrate, diameter across the top, band.

The permit decides this, not the datasheet

Rarely made on performance. It is made by whoever signs the hot-work permit, and on a fuel berth that person often signs nothing.

• The sealed cap needs an open flame. Recovery is above 125 °C from a propane or butane torch, on a structure whose deck, fenders and piles are all combustible and whose neighbours are boats. That is a permit and a fire watch.
• The push-on cap needs nothing. No torch, tools or skill, which is why it survives where a permit is refused outright. Ordering variants of the moulded PVC form are on the manufacturer's vinyl pole cap page.
• Nobody should call the push-on version waterproof. No adhesive, no mastic, no published ingress rating: a cover over the crown, not a seal into it. It still earns a line, keeping birds off and taking freeze-thaw, UV and ozone.
• Sequence by tide, and let each cap cool. Take the crowns that come dry at low water first, and keep the fuel berth as its own visit under its own permit. A crew re-coiling rope onto a warm pile undoes the bond it just paid for. Technique on installing a heat-shrink cap; flame-free routes on end caps where no flame is allowed.