What does ANSI 125 mean?
The nominal flange Class (e.g., Class 125) generally represents the maximum working pressure at the temperature of saturated steam at that pressure. For example, an ANSI/ASME B16. 1 Class 125 flange is rated for 125 PSI at 353oF.
What is a 125 flange?
1 Class 125 flange is rated for 125 psi at 353ºF (178ºC), which is the boiling temperature for water at that pressure. As temperature increases, the pressure rating of the flange decreases.
What is a class 125?
Class 125 fittings do not undergo any testing. They are taken straight from the assembly line and are shipped from the manufacturer. Since class 125 fittings forego testing, they are cheaper; however, they do not pass inspections.
What is the difference between ANSI 150 and 300?
A Class 300 flange can handle more pressure than a Class 150 flange, because a Class 300 flange are constructed with more metal and can withstand more pressure.
What is ANSI class rating?
What is an ANSI Class Rating? The ANSI Class rating of a flange is defined as the maximum amount of pressure that the flange can withstand at increasing temperatures. There are seven primary pressure classes for flanges. They are 150, 300, 400, 600, 900, 1500, and 2500.
What are the classes of flanges?
Flange Class There are seven Class 150#, 300#, 400#, 600#, 900#, 1500#, and 2500#. Higher the flange ratings, heavier the flange, and can withstand higher pressure and temperature. So, when the temperature goes up for a given material, the maximum allowable pressure goes down, and vice versa.
What is class 125 PVC?
Class 125 fittings are a subclass of schedule 40 large diameter PVC fittings. They are a more cost effective option suited for handling fluid systems with lower overall pressure. Class 125 PVC fittings differ from standard schedule 40 in their approved maximum pressure rating and associated purchase cost.
What is 150 class flange?
As temperature increases, the pressure rating of the flange decreases. For example, a Class 150 flange is rated to approximately 270 PSIG at ambient conditions, 180 PSIG at approximately 400°F, 150 PSIG at approximately 600°F, and 75 PSIG at approximately 800°F.