Abstract:
The connection methods of stainless steel pipe f...
The connection methods of stainless steel pipe fittings vary according to their principles, but most of them are easy to install, firm and reliable.
The sealing ring or gasket material used in the connection is mostly made of silicone rubber, nitrile rubber and EPDM rubber that meet the requirements of national standards.
The common connection methods of straight transition joints are divided into compression type, compression type, union type, push type, push thread type, socket welding type, union type, welding type and derivative series connection mode combining welding and traditional connection .
Stainless steel pipe fittings are used in various industries in Wenzhong. It includes: stainless steel elbow, stainless steel tee, stainless steel cross, stainless steel reducer, stainless steel cap, etc. According to the connection method, it can be divided into socket type, thread, flange stainless steel Pipe fittings, etc., its processing technology requirements mainly include geometric dimensions, welding quality, surface quality and mechanical properties, packaging requirements, etc.
Geometric dimensions include outer diameter, inner diameter, and wall thickness. It is also required to control the radius of curvature. For example, if the radius length is 1.5D, then the radius of curvature must be within the required tolerance range.
Since most stainless steel pipe fittings are used for welding, in order to improve the welding quality, the ends are dismantled into bevels, leaving a certain angle, with a certain edge, this requirement is also more stringent, how thick the edge is, custom-made hexagon socket plugs There are regulations on the angle and deviation range, and there are many more items than pipe fittings in terms of geometric dimensions. The surface quality and mechanical properties of stainless steel pipe fittings are basically the same as those of pipes. For the convenience of welding, it is the same as the steel type of the connected pipe.
Stainless steel pipe fittings must undergo surface treatment, and the oxide scales on the inner and outer surfaces are sprayed off by shot blasting, and then coated with anti-corrosion paint. This is for export needs, and moreover, it is also for the convenience of transportation in China to prevent corrosion and oxidation, and we must do a good job in this area.
Requirements for packaging For small stainless steel pipe fittings, such as export, you need to make a wooden box, about 1 cubic meter. It is stipulated that the number of elbows in this box should not exceed one ton. The sets are small, but the total weight usually cannot exceed 1 ton. For large pieces, they must be packaged individually, such as 24″, which must be packaged individually. In addition, there is a packaging mark, which must indicate the size, steel number, batch number, and manufacturer’s trademark. Steel stamps must be stamped on the pipe fittings, and a packing list should be attached and warranty documents.
Stainless steel pipe fittings are divided into threaded pipe fittings and welded pipe fittings. According to the material, they can be divided into 304, 321, 310, etc. The production standards are divided into international standards, American standards, German standards, etc.
Pipe fittings made of stainless steel, including stainless steel elbows, stainless steel tees, stainless steel crosses, stainless steel reducers, stainless steel caps, etc. Next, the Ningbo hydraulic joint manufacturer will introduce to you the related issues of stainless steel pipe fittings processing and transportation.
1. The arc starting of multi-pass multi-layer welding of stainless steel pipe fittings adopts the reflow method, and the arc ending should fill the arc crater. Arcing or arcing on the base metal surface of pipes and fittings is prohibited. Defects such as air holes and cracks found at the arcing or arcing place should be cleaned up.
2. During tack welding, the inner side of the weld should be filled with argon for protection.
3. The pipe cutting of stainless steel pipe fittings cannot be cut with ordinary grinding wheels, but special grinding wheels or plasma should be used for cutting.
4. After welding, the pipe fittings should be pickled and passivated.
5. When lifting materials, they should not be in direct contact with other metals, and should be padded with non-metallic materials such as wood boards or rubber boards.
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