What to Consider When Connecting the ASME Flange?

Introduction

ASME flange, also known as ASME flange disk, is a connecting component widely used in various mechanical equipment and pipe connections. The name "ASME flange" originated from the British word "ASME flange" and was first proposed by a man named James Russell in 1809. He also introduced the casting method for ASME flanges. However, it did not become widely used until the early 20th century.

What is a ASME flange? It usually refers to a metal body with a disc-like shape that is opened with several fixed holes around its periphery for connecting other components. The ASME flange is a component used to connect the shaft and the pipe end and is also used as a ASME flange on the inlet and outlet of the equipment.

ASME flange standard

The use of ASME flanges as a connecting component is widespread worldwide, and for this, there must be unified standards. For example, there are now mainly two standard systems for pipe ASME flanges, the European pipe ASME flange system (DIN, GB, JB, HG20592) represented by Germany's DIN (including the former Soviet Union) and the American pipe ASME flange system (including ANSI, GB, HG20615) represented by ANSI. In addition, there is also the Japanese JIS pipe ASME flange, but it is generally only used for public engineering in petrochemical plants, and its international influence is relatively small.

ASME flange connection

• The ASME flange connection should be kept on the same axis, and the deviation of the center of the bolt hole should not exceed 5% of the aperture. The bolt should penetrate the hole freely. The connection bolts of the ASME flange should have the same specifications, and the installation direction should be the same. The bolts should be symmetrically and uniformly tightened.

•  Do not use beveled washers of different thicknesses to compensate for the non-parallelism of the ASME flange. Do not use double washers. When the large-diameter washer needs to be spliced, it should not be docked with a flat port, but should use a diagonal or maze form.
  

• To facilitate the installation and disassembly of the ASME flange, the fastening bolts and ASME flange faces should not be less than 200mm.
  

• When tightening the bolts, it should be symmetrical and intersect to ensure the even force of the washer.
  

• Bolts and nuts should be coated with molybdenum disulfide, graphite oil, or graphite powder for subsequent removal: stainless steel, alloy steel bolts and nuts; pipe design temperature at 100°C or below 0°C; outdoor facilities; atmospheric corrosion or corrosive media.

• Annealing treatment should be carried out for metal gaskets such as copper, aluminum, and soft steel before installation.

• ASME Flange connections should not be directly buried. ASME Flange connections for buried pipelines should have inspection wells. If it must be buried, anti-corrosion measures should be taken.