Rating pressure of flanges

Below an example of a flange NPS 12 with the several pressure classes. A flanged joint is composed of three separate and independent although interrelated components; the flanges, the gaskets, and the bolting; which are assembled by yet another influence, the fitter.

Flanges as per Standard

Use of these ratings for flanged joints not conforming to these limitations is the responsibility of the user. They are always applied to special, accompanying flanges which ensure good, reliable sealing with the correct choice of profiles and material. The same material can handle different amount of stress at a different temperature.

My answer of course: Further, the RTJ flange will be damage the gasket, especially if a spiral wound or metal jacketed gasket is applied. Interpolation between class designations is not permitted. Unique pressure classes for piping can also be developed for a process plant or power generating station; these may be specific to the corporation, engineering procurement and construction EPC contractor, or the process plant owner.

Flanges are used when joints need dismantling. For intermediate temperatures, linear interpolation is permitted.

These ratings are established by based on the prime factor of hydro testing of the flanged fittings to the bursting and by adding a factor of safety of 3. An RTJ flange may have a raised face with a ring groove machined into it.

Example of Pressure Rating Flanges can withstand different pressures at different temperatures. They seal by an initial line contact or a wedging action as the compressive forces are applied.

Pipe Flanges – A complete Guide for Engineer

In this standard, flanges are classified based on their pressure-temperature rating which is also known as a flange class. It Provides flexibility for maintenance. The temperature shown for a corresponding pressure rating is the temperature of the pressure-containing shell of the component.


Stub end is butt welded to the pipe and Backing flange freely move over the pipe. In general, this temperature is the same as that of the contained fluid. If you want to make a connection between the two flanges, you can only apply a flat gasket.

The types of EN flanges and collars are type no. Use of these ratings for flanged joints not conforming to these limitations is the responsibility of the user.

Flange faces

To allow easy functionality and interchangeability, these are designed to have standardised dimensions. Blind flanges are also used as a manhole cover in the vessel. The concept of flange ratings likes clearly.

ASME / ANSI Flange Ratings – Learn about Pressure-Temperature Ratings of Flanges

A Class flange can handle more pressure than a Class flange, because a Class flange are constructed with more metal and can withstand more pressure. Corr Tech, Inc plastic pipe.

Maximum temperature and pressure ratings of flanges conforming dimensions ASME B Pipe Flanges and Flanged Fittings - and materials specification ASTM A Specification for Carbon Steel Forgings for Piping Applications - temperature in Fahrenheit and pressure in psi.

Carbon Steel flanges are being made of low alloy carbon steel metals i.e. plates and forgeable solid bars. Carbon Steel flanges are corrosive in nature but very reasonable priced metal. Making of Carbon Steel Flanges. ASME / ANSI Flange Ratings – Learn about Pressure-Temperature Ratings of Flanges While working with ASME/ANSI Flange, the terms such as Flange Ratings, Flange Pressure Ratings, Flange Class, pressure temperature rating of.

Pressure Classes of Flanges

Why Choose Us. Excel Metal & Engg. Co. Is a ISO Certified Which Annually Produces 15, Tons Of Ring-Type Forgings And Around 10, Tons Of Finished Pipe Flanges And Pipe Fittings In Materials Like Stainless Steel, Carbon Steel, Alloy Steel, Inconel,Monel,Hastelloy Etc.

Rating pressure of flanges
Rated 0/5 based on 99 review
Flanges General - Pressure-temperature ratings ASTM and ASME -