What does 150 lbs flange mean?
Table of Contents
What does 150 lbs flange mean?
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 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.
What pressure is a 1500 flange rated for?
ANSI FLANGE ASTM A105, A350 Gr. LF2/LF6 Class 1
| ANSI/ASME B16.34 | ANSI PRESSURE RATING | |
|---|---|---|
| Temperature in C° | 150# | 1500# |
| -29 / 38 | 19.6 | 255.3 |
| 50 | 19.2 | 250.6 |
| 100 | 17.7 | 233 |
How much pressure can a 300 flange take?
570 psi
the class 300 flange (bigger and stronger, but with the same bore size) withstands 570 psi at the same temperature of 600 degrees F°
How do I choose a flange?
Guidelines for Selection of Various Types of Flanges (PDF)
- Pressure Temperature Rating of Flanges.
- Flange Dimensional Standards.
- Flange Facings.
- The bore of Welding Neck Flanges and Hub Design.
- Flange Material Limitations.
- Iron Flanges.
- Carbon Steel Flanges.
- Low and Intermediate Alloy Steel Flanges.
Why are flanges rated in pounds?
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. See the below image comparison of 6” Class 150 and Class 2500 weldneck flange.
How do you size a pipe flange?
First, to measure the standard pipe flanges, measure the outer diameter of the flange (O.D.). It can be achieved by measuring from the outer edge of the flange to the opposite outer edge and then measuring the flange’s inner diameter from these two outer reference points.
Which flange can handle more pressure?
Flanges with a higher rating (class) are stronger than flanges with lower ratings, as they bear more pressure at increasing temperatures.
