Product Name：JIS Flange Cover Steel Pipe Flange
Flange connection is to fix two pipes, pipe fittings or equipment on a flange, and between the two flanges, with flange pads, bolted together to complete the connection. Some fittings and equipment have their own flanges and are also flanged.
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Flat welding flange processing is generally divided into four processes
First: Use scrap iron pins to temper the embryos, and the cost is low. Since most of the furnaces are small workshops, the raw materials cannot be guaranteed. The second process is simple and the carcass will have pores.
Second: steel plate cutting flanges are generally steel plates produced by regular companies. The raw materials are relatively regular, and generally small apertures are more common. It is easier to process, the tread is relatively flat, the cost is lower, and the quality can be
The third type is that large-diameter flanges are generally cut from steel plates and then heated and simmered. The raw materials are not good. Only the center will have an interface for welding. Although the weld will not be seen in the future, it is still Not recommended for use on high-pressure pipelines
Butt welding flange is a kind of pipe fittings. It refers to the flange with neck and round pipe transition and butt welding connection with the pipe. Butt welding flange is not easy to deform, has good sealing, is widely used, and has corresponding rigidity and elasticity requirements. With reasonable butt-welding thinning transition, the distance between the welding port and the joint surface is large, and the joint surface is protected from welding temperature deformation. It adopts a more complicated horn-shaped body structure, which is suitable for pipelines with large pressure or temperature fluctuations or high temperature, high pressure and Low-temperature pipelines are generally used for the connection of pipelines and valves with a PN greater than 2.5MPa; also used for plate flat welding flanges on pipelines that transport expensive, flammable and explosive media
Flat-welded flanges are suitable for the connection of steel pipes with a nominal pressure not exceeding 2.5MPa. The sealing surfaces of flat-welded flanges can be made into three types: lubricated, concave-convex and tongue-and-groove. Lubricated flat-welded flanges have the largest amount of use. It is mostly used when the medium conditions are relatively gentle, such as low-pressure unpurified compressed air and low-pressure circulating water.
But what should I pay attention to when using flat welding flanges?
Flat welding flange is a kind of flange welded by inserting the pipe into the inner ring of the flange. Flat welding flanges are divided into plate flat welding flange PL and neck flat welding flange SO. The difference between flat-welded flanges with necks and flat-welded flanges without necks is that flat-welded flanges with necks have one more place in the pipeline welding position than flat-welded flanges without necks. Lan is also a flat flange. For flat welding flange welding, only one-sided welding is required. Flat welding is better. Since the pipe and the flange are so straight, the pipe will not be inclined.
Flat-welded flanges are convenient to obtain materials, simple to produce, low-cost flange covers, and widely used; but their rigidity is poor, so they should not be used in chemical process piping systems and high, high, Extremely damaged occasions. The sealing surface types are flat and raised.
The connection of flat-neck welding flanges is to fix the two pipe stainless steel flange manufacturers, pipe fittings or devices on a flange plate respectively. Between the two flange plates, flange gaskets are added and tightened with bolts. Together, completed the connection with stainless steel flange manufacturers. Some pipe fittings and devices have their own flange, which is also a flange connection. Forged flange connection is an important connection method for pipeline construction. Forged flanges are easy to use and can withstand greater pressure. In industrial pipelines, stamping elbows connected by forged flanges are widely used. The stainless steel flange manufacturer is in the family, the pipe diameter is small, and it is low pressure, and the flange connection is not visible.
Neck flat welded flanges may leak due to the improper connection of stainless steel flanges during use, or they may have been used for too long. Users do not need to panic in this situation. The first thing to check is the leaking part. Generally, because the gap between stainless steel flanges is very small, it is impossible to inject sealant through the gap to eliminate leakage. The sealing construction method is based on the on-site survey of the leaking part. In order to complete the limited sealing, the fixed clamp method is selected to contain the leaking point to form a sealed cavity, and the sealant is injected to eliminate the leak. The fixtures on one side are all custom-made, the fixture DI must satisfy the leakage point, and establish the sealing cavity between the stainless steel flange of the valve body and the pipe butt-welded stainless steel flange to connect the short joint stainless steel flange as the key point of DI. In order to avoid the potential leakage of the gap between the valve body and the stainless steel flange due to the holding pressure, an annular cavity is set up where the fixture and the outer edge of the valve body stainless steel flange coincide. Because the fixture is easy to move to the side of the small-diameter stainless steel flange during the injection process of the reducing stainless steel flange, the limit method of tooth contact clamping is selected. After the sealant is solidified during operation, perform local reinjection and compaction through functional investigation to avoid stress relaxation, and then close the injection hole.
How to make the neck flat welding flange not deform during transportation?
The easily deformed flat welding flange with neck is a problem encountered by the factory in the first few days. A customer ordered 10 flat welding flanges with necks. Production is produced. But it got off the lathe and loaded it on the truck. After another measurement, a problem occurred.
The product requested by the customer has no waterline and no bolt holes. It is a flat product. The company communicated with the customer, and the customer is also a headache for this matter.
Some local scales are bigger, some locals are smaller. The problem is that these flat-neck welded flanges are too thin. If this problem is transported in this way, it cannot be avoided.
In the end we finally figured out a way, which is to fix the dimensions of the flat-neck welded flange with the time on the lathe and the cross welding of the steel bars. With the fixing of the steel bars, the dimensions will not change. After the necked flat welding flange delivered to the site is welded to the equipment, the steel bars are removed. And polish the position of the welded steel bar.
In this way, the problem of deformation of the neck flat welding flange during transportation is solved.
