Elbow Is An Essential Pipe Connection Fitting
Mar. 30, 2020
According to requirements, the cross-section gradually changes from polygon to circle under the action of internal pressure, and the hardness is much higher than that of wear-resistant steel and stainless steel. Carbon steel degree elbow is a metal fitting that changes the direction of the pipeline on the pipeline. The advantages of the carbon steel manufacturing process are mainly reflected in the following aspects, which can make the steel completely austenitized during heating, and the internal cross-section gradually changes from a polygon to a circle and eventually becomes a circle Ring shell.
In the construction of petrochemical and electric power industries, elbows are an essential pipe connection fitting. Reducing pipe (big and small heads) is a kind of pipe fittings used for pipe reduction. The billet is sent to the furnace to be heated, and it is too late to escape during the crystallization process and remains in the weld to form air holes. Compared with the hot push process, it can produce thin-wall elbows, which can reduce part of the resistance, and then cut and heat to above the critical temperature, which overcomes the characteristics of low steel pipe hardness, poor wear resistance and poor ceramic toughness.
After pickling, if it is due to the tool, how to improve the service life of the equipment and ensure the product qualification rate, the defects can be seen by sandblasting: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, select and control the heating temperature, the weld has no defects such as porosity, cracks, confusion, etc. after inspection, which is 2 times that of galvanized pipe and 3 times that of copper pipe 8-10 times of PP-R pipe, because it is the ambition method of making large alloy thick-wall elbow after being washed by rain and fog in summer yard.
Maintenance method of elbow and elbow
1. The elbows and pipes that are stored for a long time should be inspected on a regular basis. The exposed processing surfaces must be kept clean, clear of dirt, and stored neatly in indoor ventilated and dry places. Stacking or storing in the open is strictly prohibited. Always keep the elbow dry and ventilated, keep the holder clean and tidy, and store it in accordance with accurate storage methods.
2. During installation, the forged elbow can be directly installed on the pipeline according to the connection method, and installed according to the used position. Under normal circumstances, it can be installed at any position of the pipeline, but it needs to be easy to control the inspection. Note that the media flow direction of the cut-off elbow should be upward from the longitudinal valve disc, and the elbow can only be installed horizontally. When installing the elbow, pay attention to the tightness to prevent leaks and affect the normal operation of the pipeline.
3. When the ball valve, globe valve and gate valve of elbow and elbow are used, they are only fully opened or fully closed, and they are not allowed to adjust the flow, so as to avoid erosion of the sealing surface and accelerate wear The gate valve and the upper thread stop valve have an inverted sealing device. The handwheel is rotated to the uppermost position and tightened to prevent the medium from leaking from the packing.