Marine Suction Bellmouth Black Oxide Coating
Suction bellmouth should be tested for the appearance of quality, does not affect the use of defects, the size should be in line with the appropriate standards, for water pressure test for 3 minutes without leakage phenomenon.
The marine suction bellmouth should have the corresponding signs and inspection marks.
Overview
Principle
Black oxidation treatment is a common means of chemical surface treatment, the principle is to produce a layer of oxide film on the surface of the metal, in order to isolate the air, to achieve the purpose of rust prevention.
When the appearance requirements are not high, black treatment can be used, and the surface of steel parts is blackened. Black oxidation treatment because it can eliminate reflections.
Main Parts | Material | ||
Name | Code | Standard | |
Flange | Structural carbon steel | 20 | GB/T699-1999 |
Connection | 10 | ||
Body | Carbon Steel | Q235-A | GB/T700-1988 |
