How to install flange elbow correctly?

The correct installation of flange elbow usually includes the following steps:

1.** Preparation stage: * *

-Confirm that the flange elbow matches the material, specification and pressure grade of the pipeline to be connected.

-Check the flange surface for scratches, dents or other defects, and repair or replace it if necessary.

-For stainless steel or other metal materials, degreasing and passivation may be needed to ensure the flange surface is clean and free of oil stains and impurities, so as to ensure the welding quality or sealing effect.

2.** Pipe end processing: * *

-The pipe end shall be turned 90 degrees as required (also called expansion joint or groove). After flanging, ensure that the nozzle is flat and vertical, without burr and concave-convex deformation.

-If prefabricated flanging short pipe is used, weld it on the main pipe, and ensure the weld quality meets the standard requirements.

3.** Flange assembly: * *

-Put the flange together with groove ring or gasket (such as asbestos rubber gasket, winding gasket, etc.). ) at both ends of the flanged pipe.

-According to the design requirements, place appropriate sealing gaskets between flanges, and ensure that the gaskets are centered and not offset.

4.** Fastener installation: * *

-Butt the two flanges with bolts, and gradually and evenly tighten the bolts diagonally to avoid flange deformation or local over-tightening.

-The pre-tightening force of bolts should be controlled according to the data provided by the manufacturer or relevant specifications to achieve the specified torque value.

5.** System test: * *

-After installation, carry out system pressure test to check whether there is leakage.

-For some special applications, nondestructive testing (NDT) may be required to confirm the welding quality and the integrity of flange connection.

6.** Anticorrosion and marking: * *

-after all inspection, do a good job of anti-corrosion treatment and equipment identification in accordance with the regulations.

7.** Maintenance and record: * *

-Record the tightening torque and other key information of flange connection as the basis for future maintenance and inspection.

In a word, the installation of flange elbow must be carried out in strict accordance with process regulations and safety standards to ensure the reliable connection and long-term operation of pipeline system.