5 32 90 degree brass tube elbows

90°、45°elbow

Frequent pipe fittings in the petrochemical equipment、Three-way、Sizehead、Pipe components such as hood，Today mainly introduces the elbow。

Common in engineering90°and45°elbow，But there is also a special angle of elbow30°、60°、180°elbow，30°、60°This type of fitting is not found in the standard.，Therefore, there is less engineering，Generally used in installation spatial restrictions，On-site standard90°Cut made of elbows。

The elbow is divided into a welding according to the connection.、Insert welding elbow、Threaded elbow、Flange elbow。Here, these elbows are introduced.：

1、 Reference standard for welding headGB/T12459-2017andGB/T13401-2017implement。Divided into seamless fittings and welded pipe parts。Specification rangeDN15toDN1500。45°The elbow is divided into a long radius（1.5D）and3D；90°The elbow is divided into a long radius（1.5D）、Short-range（1D）、Length radius（Not used）、3D。In addition, the radius of curvature of the elbow is not in the table listed in the table.，Different curvature radius can also be used according to the actual project。For example5D、6DWait；The outer diameter of the pipe fittings in this standard is divided intoI、IITwo series，Defate when preparing a grade table；Different timesDThe curved radius calculation formula is：D*25.4*multiple，inDShould be inch，Given1D、1.5Dand3DCurvature radius direct reference standard，There is nothing in other standards.5D、6DCan be calculated in the above formula，The result of the result of the result。The elbow wall thickness refers to the wall thickness of the pipe，Special circumstances, elbow wall thickness can also be thick than pipelines。

2、 Thread and insert welding elbow reference standardGB/T14383-2008implement；The elbow of this standard is forged。SizeDN6toDN100；The wall thickness series of inserted welding is divided intoCLASS3000、CLASS6000、CLASS9000Three kinds；The thread connection is divided intoCLASS2000、CLASS3000、CLASS6000Three kinds；The outer diameter of the pipe fittings in the standard is divided intoI、IITwo series，Defate when preparing a grade table；Thread connection and insert welding connection are mainly used in nominal diameter less than or equal toDN40Pipeline，But can not be used on pipes with gap corrosion media，For example, the medium contains chloride ion in the medium。

(5 32 90 degree brass tube elbows)3、Oblique elbow，Strawn rice elbow，This elbow can buy product parts，But there is no standard。Shrimp rice bending：①design pressure≤2.0Mpa，And the design temperature is below the creep temperature of the material；②The oblique elbow changes direction is greater than45°By，Not availableGC3Grade pipeline；③The change direction of the oblique elbow is greater than22.5°By；Not availableGC1Level pipeline and severe cycle；④The radius of curvature of the oblique elbow should not be less than the radius of curvature of the elbow of the same size long radius.；Variable direction angle is in the figure belowα：

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