Page 4 of Technical Articles for Pipe Fitting

Introduction There are 8 cracking furnaces in a workshop, from NO.1 to NO.8. Furnaces from NO.1 to NO.7 are a USC-176C tube cracking furnace, and NO.8 furnace is a USC-12M circulating gas cracking furnace, of which the USC-12M circulating gas cracking furnace has the structure of a...

4. Scanning electron microscopy analysis Cut the tee along the crack's propagation direction and performed scanning electron microscopy analysis. The microscopic morphology of the fracture is shown in Figure 6, and the propagation direction of the crack was from the inner wall...

Abstract: Through the macro inspection, chemical analysis, metallographic analysis and scanning electron microscopy analysis of the tee of the stainless steel pipeline at the inlet of the liquefied gas pump of a hydrocracking unit of a certain company. It is believed that the cause of the...

2.7 The analysis of the end of the crack  (1) The analysis of the macroscopic fracture: it could be seen that the surface of the fracture was uneven by intercepting the sample; dendritic crystal texture was visible, and the surface was oxidized and black....

Abstract: During the operation of the hydrogen manufacturing conversion furnace, the furnace tube and hot-wall tube of the hydrogen manufacturing furnace work at high temperatures, and the medium in the tube is complicated. Cracks are found in the cap of the hot-wall tube...

A high-pressure bend is a kind of pipe fitting used at the turning of the high-pressure pipeline. Among all the pipe fittings used in the high-pressure system, the proportion of a high-pressure bend is the largest, about 80%. Its quality including mechanical properties and dimensional...

2.6 The scanning electron microscope observation and energy spectrum analysis Sample at A according to the position shown in Figure 3 for the scanning electron microscope and energy spectrum analysis. Scanning electron microscopy results are shown in Figures 4 and 5. The crack fractures mostly...

Abstract: An austenitic stainless steel tee in an industrial pipeline of a coal chemical plant cracked and failed in the use process. Inspection and sampling tests are performed for the tee in this article, including macroscopic inspection, hardness measurement, metallographic analysis...

Pipelines, roads, railways, air and water transportation are the five major transportation. Among them, pipelines have the advantages of large transportation volume, small engineering volume, short transportation distances and low losses, which play an irreplaceable role in petroleum,...

For austenitic stainless steel pipe fittings that have not been subjected to solution heat treatment or it is not in accordance with the solution process before leaving the factory, the inspector can't know whether they are well treated based on the appearance on site. The principle of...