Pipe flanges are used to connect pipe sections to other pipe sections, inline components, and equipment. Welding neck flange has reasonable structure and a higher strength and stiffness. It is suitable for the pressure temperature fluctuation range large or high temperature, high pressure and low temperature pipeline. There are a number of important factors should consider when choosing pipe flanges for buyers. When tackling shipping jobs, knowing the flanges weight is essential.

Outside diameter: A1

Inside diameter: B1

Sheet thickness: C

Number of drill holes:  D1

Drill hole diameter:  C1

Hub diameter at the beginning of chamfer of welding neck flanges: A

Root diameter of the hub: X

Number of bolts: n

The overall length through hub: H

1. Weight Chart of Pope Flanges to ASME B 16.5 Weight is in KG. The weight of flange with a flat face back end of flange

W=(A1*A1－D1*C1*C1)*C*6.228/1000000(Kg)

2. Take the weld neck pipe flanges with raised face, which is the most widely used pipe flange facing for example. The weight of raised flange is divided into 2 parts. One part can be treated as a short length of pipe,The other can be treated as a truncated cone deducted by a cylinder. The total weight add up to the weight of a weld neck flange.

Formula 1: W =[(A1*A1－B1*B1－D1*C1*C1)*C+(X*X-A*A)*H]*6.228/1000000

Formular 2: W=[(A1*A1－B1*B1－D1*C1*C1)*C-(A1*A1-X*X-D1*C1*C1)*H]*6.228/1000000

3.The materials used to construct a pipe flanges directly relate to the weight and the pressure it can handle. As illustrated in above drawing, Take the 304 SS flanges weight for example:

Pipe flanges volume=π/4*A1*A1－B1*B1－D1*C1*C1)*C(mm)

304 density=7.93/1000000 Kg/cm^3

W=(A1*A1－B1*B1－D1*C1*C1)*C*π/4*7.93/1000000(kg)