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Installation knowledge of stainless steel pipe fittings
Source: | Author:kanglongen | Publish time:2023-04-13 | 136 Views: | Share:

Stainless steel is a type of pipe material with high Cr content, and its anti-corrosion performance is much higher than that of ordinary steel pipes. The commonly used material grades of stainless steel include: 201, 202, 304, 304L, 316, 316L, etc. You can choose the corresponding brand to use according to the different water quality, water supply pressure, and temperature.

Next, let's talk about several points to pay attention to when installing stainless steel pipe fittings.

1. Stainless steel pipe fittings should be cleaned, dried or wiped clean before installation to remove pollutants such as oil stains. If there is mechanical damage to the surface of the pipe, it should be trimmed to make it smooth and should be pickled or passivated.

2. Avoid contact between stainless steel fittings and carbon steel brackets. A stainless steel plate and a chloride free plastic or rubber gasket should be placed between the bracket and the pipeline.

If the stainless steel pipeline is long or the temperature of the conveying medium is high, a stainless steel compensator should be installed in the pipeline. Common compensators are square and corrugated, but the choice depends on the pipe diameter size and working pressure.

4. If carbon steel loose flange connection is used, the corrosion of the carbon steel flange will come into contact with the stainless steel surface, so long-term contact process will cause molecular diffusion and stainless steel will rust. An insulation layer should be laid between the loose flange and the stainless steel pipe fittings to prevent corrosion and insulation. The insulation material can be made of chlorine free plastic, rubber, or asbestos rubber sheets.

5. When stainless steel pipe fittings cross walls or floors, sleeves must be installed. The gap between the sleeve and the pipeline should be at least 10mm, and the gap should be filled with insulation material. The insulation does not contain impurities such as iron filings and rust, and can be insulated with asbestos rope.

6. The flange gasket can be selected as a soft gasket or a metal gasket based on the conveying medium, working temperature, and pressure.

7. When welding stainless steel pipe fittings, manual argon arc welding or manual electric arc welding is generally used. The welding rod used should be dried for 0.5 to 1 hour at a temperature of 150 to 200 ° C, and the welding temperature should not be lower than -5 ° C. If the temperature is slightly lower, preheating measures should be taken.