Shipbuilding & shipyards
Piping material for shipyards and marine outfitters – flanges to shipbuilding standards, seawater-resistant materials and survey by classification societies.
Flanges to shipbuilding standards
Shipbuilding has its own flange standards. They differ in design and connecting dimensions from the shore standards – order EN 1092-1 here and you receive parts that will not fit on board.
| Standard | Design | Application |
|---|---|---|
| DIN 86029 | Slip-over flange | PN 10 – slipped over the pipe and welded, the standard on board |
| DIN 86030 | Slip-over flange | PN 16 – slip-over flange as DIN 86029, one pressure rating up |
| DIN 86041 | Welding flange | For tank walls, sea chests and overboard connections |
| EN 1092-1 | Weld-neck, blind, loose flange | Where shore standards are specified, e.g. engine rooms |
| ASME B16.5 | WN / SO / BL / LJ | With American specification |
Collars, loose flanges and fittings are supplied to match. Designs and dimensions in detail under flange types and in the flange dimension tables.
Seawater, chlorides, condensate
Seawater is a harsh medium for standard stainless steels. Chlorides attack the passive layer and cause pitting and crevice corrosion – precisely where it cannot be seen.
| Material | Standard | Typical use on board |
|---|---|---|
| CuNi 90/10 (2.0872) | EN 12449, DIN 86019 | Seawater cooling, ballast, fire main |
| 1.4404 (316L) | EN 10216-5 | Fresh water, hydraulics, general process lines |
| 1.4462 (duplex) | EN 10216-5 | Chloride-bearing media, higher strength at thinner wall |
| 1.4410 (Super-Duplex) | EN 10216-5 | Offshore, desalination, aggressive seawater systems |
| 1.4547 (254 SMO) | EN 10216-5 | Superaustenitic for the highest chloride loading |
| P235GH, S235JR | EN 10216-2, EN 10025-2 | Steam, fuel, lines without seawater contact |
Which material is right depends on medium, temperature, flow velocity and chloride content. The full overview is under materials.
Classification societies
In shipbuilding a 3.1 certificate is often not enough. What is regularly required is the inspection certificate 3.2 to EN 10204 – with attendance and countersignature by a surveyor of the classification society.
On request we supply with survey by DNV, Lloyd's Register, Bureau Veritas, RINA, ABS or ClassNK. Important: the survey must be arranged before manufacture – a certificate with an attending surveyor cannot be created retrospectively.
What the individual certificate types mean is explained in inspection certificate 3.1 or 2.2.
Machining & order picking
| Item | Details |
|---|---|
| Cutting | Sawn fixed lengths and fitting pieces from 0.1 to 12 m, sawn and bevelled |
| Machining | Drilling, facing, pipe bending with special radii, threading to EN 10226 |
| Surface | Blasting Sa 2½, primer and top coat, galvanising to EN ISO 1461 |
| Special parts | Flanges to drawing and works standard, collars with recess – from a single piece |
| Marking | Material, batch and mill per item, assigned to the order |
| Order picking | In installation sequence, packed by section or by system |
Manufacture to drawing is under special parts and custom manufacturing, the complete pipe range under pipes and piping systems.
Material for your vessel project?
Grade, standard, size, pressure rating and quantity are enough – on request with survey by the classification society. Your quote usually the same day.