When referring to ASTM A105 flanges, the term "schedule" typically refers to the wall thickness of the pipe, but it can also be applied to flanges in terms of pressure class or rating. For ASTM A105 (carbon steel) flanges, schedule commonly aligns with pressure rating classes, such as 150#, 300#, 600#, etc. These ratings correspond to different pressure and temperature conditions that the flange can handle.
ASTM A105 Flange Pressure Ratings (Schedule)
Here's a general outline of flange ratings for ASTM A105 flanges based on pressure classes:
| Pressure Class | Nominal Pressure (PSI) | Temperature Range |
|---|---|---|
| 150# | Up to 285 PSI | Up to 100°F (38°C) |
| 300# | Up to 740 PSI | Up to 100°F (38°C) |
| 600# | Up to 1480 PSI | Up to 100°F (38°C) |
| 900# | Up to 2220 PSI | Up to 100°F (38°C) |
| 1500# | Up to 3700 PSI | Up to 100°F (38°C) |
| 2500# | Up to 6170 PSI | Up to 100°F (38°C) |
What is Schedule in Flanges?
Schedule (or Schedule number) is a term used for pipe wall thickness, but for flanges, it typically refers to the pressure class of the flange.
For example, Schedule 40 or Schedule 80 pipe corresponds to the thickness of the pipe wall. For flanges, pressure classes (such as 150#, 300#, 600#) are used instead of specific schedules like those used for pipes.
Example of Flanges with ASTM A105:
ASTM A105 flanges are generally available in pressure classes such as 150#, 300#, 600#, etc., depending on the application and pressure requirements.
The size and pressure rating will determine the thickness of the flange's body and its capability to handle internal pressure.
If you're looking for specific dimensions for ASTM A105 flanges with a particular pressure class, you can refer to standards like ASME B16.5, which outlines the detailed specifications for flanges including size, pressure rating, and material thickness.
