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News
Failures of Welding Seams of Slip-on Flanges of Thermal Pipelines
- Posted: 01/28/2023 12:01:58
- Hits: 80
When the heating medium is hot water, the working pressure is up to 2.5MPa due to the low pressure of the thermal pipeline. When the heating medium is steam, the working pressure is up to 1.6MPa. Therefore, in the construction process, the pipeline and its components adopting low carbon steel can meet...
Application of TIG Welding to SS Slip-on Flanges (Part two)
- Posted: 12/25/2022 10:12:13
- Hits: 68
4. Welding steps (1) Requirements for base materials: stainless steel 304, 304L, 316, and 316L are used for slip-on flanges and pipe fittings, and it is better to use the same type of stainless steel for flanges and pipes. The diameter d of the inner hole of the slip-on flange is slightly larger than...
Application of TIG Welding to SS Slip-on Flanges (Part one)
- Posted: 12/11/2022 10:12:47
- Hits: 62
Abstract: Stainless steel slip-on flange and pipe fittings are connected by TIG welding, and self-flux welding is adopted for the flange’s sealing surface. The non-sealing surface of the flange is welded with wire to realize the function of the connection of the flange. 1. Introduction...
Control Deformation Caused by Welding of Slip-on Flanges with Large Diameters
- Posted: 10/22/2022 10:10:02
- Hits: 241
Abstract: In the manufacturing process of pressure vessels, deformation caused by the welding of slip-on flanges with large diameters often occurs. By analyzing the causes of deformation, the measures to control the deformation are proposed to provide guidance for preventing deformation caused by welding...
Research on the Manufacturing Process of Large Flanges
- Posted: 09/24/2022 10:09:46
- Hits: 45
With the advancement of science and technology, modern petrochemical enterprises are developing in the direction of large scale and complication. The large-scale equipment has brought opportunities to the manufacturer, but it has also brought greater challenges. In the manufacturing process of large...
Cracks & Corrosion in the Heat-affected Zone of DSS Flange (Part One)
- Posted: 09/10/2022 05:09:21
- Hits: 14
Abstract: Aiming at the leakage during the testing of the seawater pipeline system of a nuclear power plant, from the construction to the testing process, the multi elimination methods were used to analyze the corrosion. By analyzing the properties of the material, distribution of stress, and the medium...
Analysis Results of 304 Stainless-steel Flanges in Propylene
- Posted: 08/22/2022 03:08:47
- Hits: 24
Discussion of results 0Cr18Ni9 stainless steel has good corrosion resistance, especially excellent resistance to intergranular corrosion, so it is an ideal material for chemical equipment such as acid-resistant containers, pipes and heat exchangers. The material of the failed flange was severely sensitized,...
Failure Analyses of 304 Stainless-steel Flanges in Propylene
- Posted: 08/12/2022 11:08:34
- Hits: 47
The stainless-steel flange in the pressure pipeline of a polypropylene plant of a petrochemical plant leaked during the operation of several flange necks. After repair welding, there was no leakage at the welded part in a short time, but other flanges still leak. The outer wall of the flange is painted,...
Characteristics & Protective Measures of Crevice Corrosion of SS Flanges
- Posted: 07/27/2022 09:07:26
- Hits: 21
1. Characteristics of crevice corrosion of stainless steel flanges are as follows: (1) The corrosion of the metal in the crevice is caused by the existence of foreign matter or structural reasons on the metal surface, which makes the migration of corrosion related substances in the solution in the crevice...
The Analysis of Causes of Corrosion of SS 304L Flanges
- Posted: 07/13/2022 08:07:22
- Hits: 58
A printing and dyeing equipment factory added water for the pressure test to the pipeline connected to stainless steel 304L raised face flanges. The pressure test water was not emptied in time in the pipeline. After about 15 days, it was found that the flange's sealing surface was corroded. The...
Causes of Corrosion of SS Flanges in a Nuclear Power Plant (Part Two)
- Posted: 05/23/2022 09:05:46
- Hits: 64
2. The analysis of the causes of corrosion of stainless steel flanges 2.1 The analysis of the material The grade used for SEC stainless steel flange is 316L, and its PRE (pitting corrosion resistance equivalent) calculated by the formula is lower than that of duplex stainless steel. This kind of stainless...
Causes of Corrosion of SS Flanges in a Nuclear Power Plant (Part One)
- Posted: 05/09/2022 08:05:42
- Hits: 35
Overview The important water system (SEC) is an open circulation system; its internal medium is seawater, and its main function is to cool the cooling system of the cooling equipment. The main function of RRI is to cool various types of heat exchangers in the nuclear island. The heat load of the nuclear...