In pipeline installation, flange fasteners are a very important part. The quality of flange fasteners is directly related to the safety and stability of the pipeline. Therefore, during the pipeline installation process, the inspection requirements for flange fasteners are very strict. Next, let's take a closer look at the inspection requirements for flange fasteners in pipeline installations.

1. Appearance inspection

First, check the appearance of the flange fasteners. Mainly check whether the surface of the flange fastener is smooth and whether there are obvious defects such as unevenness, cracks, and air bubbles. At the same time, it is also necessary to check whether the size of the flange fasteners meets the requirements and whether there is any deformation.

2. Material inspection

Secondly, the material of the flange fasteners should also be checked. The material of flange fasteners should comply with national standards or relevant industry standards. At the same time, it is also necessary to check whether the material is uniform and whether there are defects such as inclusions and pores.

3. Hardness inspection

The hardness of flange fasteners also needs to be checked. Hardness checking can be done with a durometer. The purpose of hardness inspection is to determine whether the strength of flange fasteners meets the requirements. If the hardness does not meet the requirements, the strength of the flange fasteners will be affected, thereby affecting the safety of the pipeline.

4. Tensile test

The tensile test is also an important part of flange fastener inspection. Tensile testing can test the strength and toughness of flange fasteners. The method of tensile test is to put the flange fastener on the tensile testing machine, apply a certain tensile force, and observe the deformation and failure form of the flange fastener. If the tensile strength and toughness of the flange fasteners do not meet the requirements, then the flange fasteners need to be reselected or replaced.

5. Chemical Composition Analysis

Chemical composition analysis is also an important part of flange fastener inspection. Chemical composition analysis can determine whether the composition of the flange fastener meets the requirements. If the composition of flange fasteners does not meet the requirements, it will affect the performance and service life of flange fasteners.

6. Surface treatment inspection

Surface treatment is also an important part of flange fastener inspection. Surface treatment can prevent corrosion and oxidation of flange fasteners. Surface treatment methods include galvanizing, painting, and so on. When checking the surface treatment, it is necessary to check whether the thickness of the surface treatment meets the requirements, whether it is uniform, whether there is falling off, etc.

7. Dimensional inspection

Finally, the dimensions of the flange fasteners also need to be checked. Dimensional checks can be done with gages. The purpose of dimensional inspection is to determine whether the size of flange fasteners meets the requirements. If the size does not meet the requirements, it will affect the installation and use of flange fasteners.

To sum up, the inspection requirements for flange fasteners in pipeline installation are very strict. Only through strict inspection can the quality of flange fasteners and the safety of pipelines be guaranteed. Therefore, during the pipeline installation process, it is necessary to carry out inspections in strict accordance with relevant standards and requirements to ensure that the quality of flange fasteners meets the requirements.