What is the difference between Class 150 and 125 flange?

Class 125 and Class 250 are cast iron flanges and flanged fittings while Class 150 and Class 300 are ductile iron, steel or stainless steel. Hence, ANSI/ASME B16. 1 Class 125 flanges are made from cast iron, ANSI/ASME B16. 5 Class 150 can be made from steel or stainless and ANSI/ASME B16.

How much pressure can a 150 flange take?

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.

What is flange pressure rating?

The term “flange rating” (or class) refers to the maximum pressure (in psi or bars) that a flange withstands at increasing temperatures. Flanges with a higher rating (class) are stronger than flanges with lower ratings, as they bear more pressure at increasing temperatures.

How much pressure can a 600 flange take?

Now refer to the pressure-temperature table for carbon steel flanges given above. Flange with 600# rating meets the requirement. You can see that Class 600# can withstand 1205 Psig pressure at 500 °F.

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 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 flange class?

What is a class 125 pipe fitting?

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.

How do I know my flange rating?

When trying to determine the flange rating of a pump, the best method is to look for a stamp printed onto the flange. If one is not visible, or it is worn, then start by counting the number of bolt holes. This will point you to a narrower range of flange sizes in the chart below.

What does class mean in flanges?

Are ANSI and ASME flanges the same?

ANSI Flanges are manufactured based on standards developed by organizations and ASME Flanges are based on codes and standards for mechanical devices. The ANSI Flanges are designed based on approx. 9500 standards whereas ASME Flanges manufactured on 600 codes and standards for different mechanical devices.

What is class 125 PVC?

What is the meaning of PN 16?

‘PN’ stands for Pressure Nominale and prefixes the pressure rating, e.g. a PN16 flange is designed to operate up to 16 bar. Typical ratings include PN6, PN10, PN16, PN25, PN40, PN64, PN100. The American ANSI standard refers instead to a pressure / temperature rating termed ‘Class’. 4.

What are classes in flange?

Are ANSI and ASME flanges compatible?

Internationally, when discussing measurements the ANSI and ASME measurements are identical, except in a few rare instances, so these designations are interchangeable.