pipe flange

true or false - true

Oh, you can often get them to fit, but your life and reputation should be worth more than that.

Generally, when doing a pipe design, the critical factor will be the pressure rating of the pipe (which determines required schedule). If you don't know that, stop and get somebody to help you. A couple hundred psi of gas can easily kill somebody. Plus, you really need to know the pressure BEFORE you decide on welded vs threaded if you're using the smaller sizes. Use a chart appropriate for your industry to select the schedule. Then buy a flange that matches that pipe.

Excuse my bluntness, but if you have to ask this question, you don't know enough to bend the rules.

thx to all for there view

dear TV i also think similar to u thats why i chose true while a appeared on a wrtten test orgnised by a pipe designer org. but they give me zero mark.

any way i have found my answer flange class or PN is required while selecting a flange for a particular size

i have downloaded nos of flange dimension (ASME 16.5) , dimension are same for a particulary size

like if we select a flanze for a 4" pipe then we will chose only on the basis of

NB,PN OR CLASS,MOC,(when u will see flange dimensional data nowhere is schedule mentioned yes it is true as well as schedule varry flange Class or PN will change accordingly dimension will change).

Sure you will consider both Schedule & PN "Nominal Pressure " while you are choosing the flange.Also it depends on your system.Sometimes you should see what kind of piping you are using and so you can specify.

Thanx

Eng Dania MJ

so the ID at the flange joint is the ID of the pipe.???

is this ---so the ID at the flange joint is the OD of the pipe.

Sometimes pipe flanges have one ID; sometimes they have two. You can get a pretty good start to seeing examples by going to

www.McMaster.com

typing in flange, going to say 150 class flanges and looking at different types. Then you might try small and big, low pressure and higher, etc. Many of the flanges you find there have dimension drawings to see.

Selection of a flange depends upon the design parameters i.e. pressure, temperature and application ( fluid, cyclic loading etc..). P-T rating of a flange is a tool for determining flange rating9(#150, #300 etc.) but the parameter P is actually equivalent pressure due to internal pressure and moment/ forces transferred to flanges due to expansion/ contraction of piping. So depending upon the layout you may need higher rating flange for relatively thin pipe (low schedule).