Using ASME B16.5 Class 150 Flange

[aeromb1985]

Hi Dear All
As you know Class 150 is the smallest flange in ASME B16.5. For many piping system it is mandatory to use this standard for project. using this flange for piping that use atmosphere air is so funny!!!. Is there any replacement for using such heavy flanges for atmosphere pressure?
Thanks

 

[pennpiper]

aeromb1985,
You have given us absolutely nothing with which to help you.
We need data!
What kind of project is this?
How does the air get into the pipe?
Where does it go?
Is the air heated?
Is it at atmospheric pressure?
What size is the piping?
Do you have a piping material specification for this service?
What does the piping material specification say regarding connection to equipment and construction in general?



prognosis: Lead or Lag

 

[aeromb1985]

Sorry
The atmospheric air in standard condition ( 1 bar and 273 K) go to a centrifugal compressor by some 16" pipes and fittings. I think using using ASME b 16.5 flanges (carbon Steel) for suction pipes is highly Over design (60 Kg Weight for 16" welding neck Flange).
Is there any suggestion for flanges that are more light?

 

[LittleInch]

Try using European (DIN) PN flanges. The lowest is PN6, rated at 6 bar. Standard is EN 1092.



My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[gr2vessels]

aeromb1985,
First, you have stated using piping;-apparently that's incorrect, you should check the 'piping' specification, most likely it said ducting instead of piping. There are many different type of flanges used in air/gas ducting, do some research for the nearest supplier of ducting in your area and they will provide the right type of the flange for your ducting. Those type of flanges are mostly to keep together the ducting, which is supported separately. The flanges are designed for ducting size, material, thickness and method of support. The flanges could be simple plate rings with some bolting holes, could be rolled angle steel to provide a joint face for bolting, etc.

 

[XL83NL]

@ LittleInch; the edt of EN 1092 I have in front of me now even goes to PN 2.5. However, for most flange types their sizes correspond to those of PN 6, so their rating is the same. I assume you meant the same thing.