Identify the key points of the breach
First check the leak location, where the leak is usually due to the stainless steel flange connection gap is very small, it is unlikely to be removed by introducing sealant from the gap.
The sealing construction is based on the spot investigation of the leakage location, the leakage point is contained by the fixed fixture method, and then the sealing chamber is constructed, and the sealant is introduced to complete the limited sealing and then the leakage is removed.
The fixture is basically customized, the fixture must be in line with the containment leak point, and the sealed cavity between the stainless steel flange and the short joint of the a pipeline is the first key point.
In order to avoid the potential leakage point of the gap between the valve body and the flange due to the pressure holding, resulting in re-leakage, a ring cavity is arranged at the edge of the tool and the stainless steel flange of the valve body.
In view of the reducing flange in the process of injection, its fixture is easy to offset to the side of the small flange, so the tooth shape contact clamping limit countermeasure should be used.
In the operation, after the sealant is cured, through the actual effect observation, the local filling compaction is carried out to avoid stress relaxation, and then the injection hole is completely closed.
Stainless steel flange in use to avoid due to the flange cover heating, resulting in eye erosion, so the welding current is not too large, less than carbon steel welding rod before and after 20%, arc is not suitable for too long, fast cooling between layers, to narrow weld bead is appropriate.
Calcium type should be continuously dried at 150℃ for 1 hour. The low hydrogen type should be dried at 200-250 ° C for 1 hour. It can not be repeatedly dried, avoid the coating splitting and falling off, avoid the coating sticking oil or other debris, and prevent the carbon content of the weld. And then affect the quality of the product.
Stainless steel flange processing steps
For such materials as stainless steel, it is important to maintain its surface clean, if it is etched after the surface of stainless steel will change shape, and not so smooth.
Therefore, these items with etched stainless steel levels need to avoid processing. Gases, whether acidic or alkaline, need to be sheltered from the environment.
Select the combination flat pad of the flange, the effect of the flange on the access pipe is indeed larger, and the good assistant of the stainless steel flange in the combination application is the asbestos gasket.
Asbestos this kind of material has its own good characteristics, it can also resist acidic substances, whether it is gas or gas can be well digested by asbestos, so it will not interfere with stainless steel.
Naturally, in some special occasions will also be applied to other materials made of flat MATS, this time will be used and stainless steel has a complementary level of flat MATS.
