# What is a class 300 flange?

## What is a class 300 flange?

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. However, there are a number of factors that can impact the pressure capability of a flange.

Table of Contents

How many bolt holes in a 300 flange?

ANSI/ASME B16. 5 Class 300 Forged Flanges Add Flanges

Nominal Size Outside Diameter (OD) No. of Bolt Holes
1⁄2 3.75 4
3⁄4 4.62 4
1 4.88 4
11⁄4 5.25 4

### What is a 300 pound flange?

300# flange bolt chart is used to assist engineers and pipe fitters with calculating the number of fasteners associated according to flange size. A Class 30 300 lb flange dimensions can handle more pressure as compared to a Class 150 flange.

How thick is a 300 flange?

How Thick Is A 300 Flange? As per the ANSI B16. 47 Series, A Class 300 Flanges chart a flange with the size of I inch will generally have an outer diameter of 4.88 and a minimum thickness of 0.62.

## What pressure is a 300 flange rated for?

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°

Are 300 and 600 flanges the same?

The difference between these three flanges is the pressure class! This is a class 150, this is a class 300, and this is a class 600. The differences are in the dimensions except for the bore! You see this is a one inch pipe that can be placed in each of the flanges.

### Are 250 and 300 flanges the same?

Now, the same applies to a 250-pound (aka Class 250 B16. 10) iron flange and a 300-pound steel flange. They match up with no issues and the bolts can be the same.

What are classes in flange?

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 the pressure rating for a Class 300 flange?

For class 300 the working pressure is 45.1 bar, hence class 300 rating is not suitable for the design conditions. The next column for class 400 has a working pressure of 60.1 bar, hence this would be a suitable pressure rating for the flange. However, class 400 is not a very commonly used pressure class.

What is the standard size for a flange?

B16.5 Welding Neck Flange 150lb

• B16.5 Welding Neck Flange 300lb
• B16.5 Welding Neck Flange 600lb
• B16.5 Welding Neck Flange 900lb
• B16.5 Welding Neck Flange 1500lb
• B16.5 Welding Neck Flange 2500lb
• B16.47 Ser.B (API)Welding Neck Flange 75lb
• B16.47 Ser.B (API)Welding Neck Flange 150lb
• B16.47 Ser.B (API)Welding Neck Flange 300lb
• ### What is Class 300 pipe?

The piping class 300 applies to the flange class 300 from ASME B16.5; or B16.47 if applicable. If the flanges are a material other than ASTM A 105 then the maximum pressure is different. Group 1.1 includes A 215 Grade WCB. Material group 1.2 is a bit higher for A 216 WCB and A 350 grade LF6 Class 2 – 51.7 bar at zero degree C.

What is a Standard flange?

Flanges are a pipe fitting which function is to join two pieces in a piping system, and easily separate them at a particular time, allowing be disassembled without destructive operations. By function and utility, the flanges are present in many sectors and areas such as construction and industry. STANDARD FLANGE CLASSIFICATION: