Environmental Engineering Reference
In-Depth Information
Tube rows
9.6
Distribution of defective tubes in rows: 1) SG1, 2) SG3, 3)
SG4.
to the surface. The chemical composition of the deposits: FeO
3
- 91.35%;
CuO - 8.6%. Pitting and corrosion traces were not found.
At a distance of 90 mm: 226.9 g/m
2
deposits, porous sediments, beneath
a small amount of Cu deposits, distributed unevenly over the surface of the
individual spots with a diameter up to 1.5 mm 8-10 deposits per 100 cm.
Under the Cu sediment there were pits with a diameter up to 0.5 mm and
0.3 mm deep. The chemical composition of the sediments: FeO
3
- 82%;
CuO - 17.1%.
At a distance of 130 mm: deposits of 632.3 g/m
2
were detected. Under
the layer of unconsolidated sediments the whole surface was covered with
Cu deposits, strongly bonded to the tube metal. Under the Cu deposits
there were a lot of small pits of up to 1 mm in diameter and up to 0.5
mm deep. There was a penetrating pit with a diameter of 3 mm from the
secondary circuit and with a diameter of 1 mm from the primary circuit.
The composition of sediments: FeO
3
- 63.44%; CuO - 30.32%.
Studies were conducted on other tubes cut from the SG3 (60-96, 60-
102). The following conclusions were drawn on the basis of the results:
1) the chemical composition of steel of the damaged HET 60-96 (SG3)
corresponds to the steel 08Cr18Ni10Ti according to TU 14-3-197-89;
2) the mechanical properties satisfy the requirements of TU 14-3-197-89;
3) damage typical of ICC was not detected (inspected by the colour
flow method);
4) non-metallic inclusions - within the range of TU 14-3-193-89;
5) the inner surface of the tube showed corrosion or other damage
(except traces of the passage of the probe);
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