Lap Joint Flanges are commonly used in applications requiring:
Lap Joint (Lapped) Flanges are manufactured and tested according to many international standards, of which ANSI (American National Standards Institute) is one of the most popular standards.
ANSI B16.5 is the standard for pipe flanges and fittings from NPS 1/2 to NPS 24, with pressure ratings from Class 150 to Class 2500.
ANSI B16.47 is the standard for larger flanges, from NPS 26 to NPS 60. This standard is divided into two categories:
ANSI B16.9 is the standard for butt weld pipe fittings, including stub ends used in Flanges Lap Joint systems.
NPS (inch) |
Outside Diameter OD (inch) |
ID Inside Diameter (inch) |
Thickness (inch) |
Bolt Hole Diameter (inch) |
Number of Bolt Holes |
Bolt Ring Diameter (inch) |
1/2 |
3.50 |
0.62 |
0.38 |
0.63 |
4 |
2.38 |
3/4 |
3.88 |
0.82 |
0.44 |
0.63 |
4 |
2.75 |
1 |
4.25 |
1.05 |
0.50 |
0.63 |
4 |
3.12 |
1 1/4 |
4.62 |
1.36 |
0.56 |
0.63 |
4 |
3.50 |
1 1/2 |
5.00 |
1.61 |
0.62 |
0.75 |
4 |
3.88 |
2 |
6.00 |
2.07 |
0.69 |
0.75 |
4 |
4.75 |
2 1/2 |
7.00 |
2.47 |
0.75 |
0.75 |
4 |
5.50 |
3 |
7.50 |
3.07 |
0.81 |
0.75 |
4 |
6.00 |
4 |
9.00 |
4.03 |
0.94 |
0.75 |
8 |
7.50 |
5 |
10.00 |
5.05 |
1.00 |
0.88 |
8 |
8.50 |
6 |
11.00 |
6.07 |
1.12 |
0.88 |
8 |
9.50 |
8 |
13.50 |
8.07 |
1.19 |
0.88 |
8 |
11.75 |
10 |
16.00 |
10.10 |
1.25 |
1.00 |
12 |
14.25 |
12 |
19.00 |
12.10 |
1.38 |
1.00 |
12 |
17.00 |
14 |
21.00 |
14.12 |
1.38 |
1.13 |
12 |
18.75 |
16 |
23.50 |
16.12 |
1.44 |
1.13 |
16 |
21.25 |
18 |
25.00 |
18.12 |
1.56 |
1.25 |
16 |
22.75 |
20 |
27.50 |
20.12 |
1.69 |
1.25 |
20 |
25.00 |
24 |
32.00 |
24.12 |
1.88 |
1.38 |
20 |
29.50 |
Note:
Material | Describe | Application |
Carbon Steel | Carbon steel is a type of steel whose main components are iron and carbon. | Widely used in the petroleum, chemical, and water supply and drainage industries due to its high durability and low cost. |
Stainless Steel | Stainless steel contains chromium and sometimes nickel, which helps resist corrosion. | Used in food, pharmaceutical, chemical industries and highly corrosive environments. |
Alloy Steel | Alloy steel contains many alloying elements such as nickel, chromium, molybdenum to enhance mechanical properties. | Applications in high temperature and pressure environments, such as in the oil and gas and energy industries. |
Copper | Copper has good corrosion resistance and high electrical and thermal conductivity. | Commonly used in the electrical, water and corrosive liquid conveying industries. |
Aluminum | Aluminum is lightweight, corrosion resistant and easy to work with. | Used in applications requiring light weight and corrosion resistance, such as in the aerospace and transportation industries. |
Low Carbon Steel | Low carbon steel has low carbon content, easy to process and weld. | Suitable for applications requiring good ductility and weldability, such as in construction and manufacturing. |
Nickel Alloy | Contains nickel for good corrosion and heat resistance. | Used in chemical, petroleum, and high temperature environments industries. |
Medium Carbon Steel | Medium carbon steel has a higher carbon content, is harder and more durable than low carbon steel. | Used in applications requiring high durability, such as in industrial machinery and equipment parts. |
Duplex Stainless Steel | Duplex steel has a two-phase structure (ferrite and austenite), enhancing mechanical properties and corrosion resistance. | Suitable for applications in the chemical, oil and gas, and seawater industries. |
Inconel | Alloy containing nickel and chromium, high heat resistance and corrosion resistance. | Used in extremely harsh environments, such as in the aerospace and chemical industries. |
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