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The document specifies drain screws for water and oil tanks, where the shell plating forms the tank bottom. The whole screw joint consists of a weld-in plate and a drain screw of metric thread which is installed with a suitable sealing. The height of the recess at the weld-in plates is rated in accordance with the shell plating thickness, thus avoiding any projection at the ship's shell.
| Author | DIN |
|---|---|
| Editor | DIN |
| Document type | Standard |
| Format | File |
| ICS | 23.040.60 : Flanges, couplings and joints
47.020.30 : Piping systems 23.040.05 : Pipelines and its parts for external sewage systems |
| Number of pages | 8 |
| Replace | DIN 87721-1 (1995-07) |
| Year | 2014 |
| Document history | DIN 87721-1 (2014-04) |
| Country | Germany |
| Keyword | DIN 87721;87721 |