Piping flange thickness design. 2

[langahl]

I am currently doing some work with titanium pipe (large diameters), how can I calculate the thickness of the flanges that I need to use on pipes of 3" to 12" diameter?

 

[butelja]

Typically standard flanges per ANSI B16.5 are used in sizes up to 24". In high alloys such as titanium, consider using carbon steel lap joint flanges with titanium stub end fittings.

 

[manian]

Flange design approaches are available in ASME Section VIII Division 1 Appendix 2, DIN 2505 and DIN 3840. You can refer to any of these codes and design your own flange meeting your needs. Ofcourse these codes have their own limitations and one has to understand the code thoroughly before applying it. ASME code can be used with ASTM Materials for which the allowable stresses are listed in Section II Part D. For the specific material that you are looking for, it would be ideal to consult some of the leading flange vendors.

 

[johnp]

The best text I have seen, complete with step by step design tables is Dennis R Moss "Pressure Vessel Design Manual" Gulf Publishing Co. This is based on Taylor Forge Bulletin No 502, 7th Edition, entitled "Modern Flange Design".
If you have any trouble getting the information then email me.

 

[MJCronin]

langdahl,

I disagree with the above comments. The methods referenced are for custom designs of vessels, which, I do not believe you are really interested in....

You must tell us the design pressure and temperature of the system !!!

First, please note that this is not large pipe...... 3 inch NPS to 12 inch NPS titanium pipe is very common in the pulp and paper industry. There are standard industry pipe flanges that are used for this pipe that are very economical.

Secondly, I am assuming you are dealing with modest pressures and thin walled piping (Schedule 5S or 10S)........ Commonly, these systems are joined with "lap-joint flanges" ( also called Van Stone Flanges) and cheaper carbon steel backup rings. The premium material, titanium in your case, is the only material to touch the fluid.

Try contacting the Felker Bros 800-826-2304 or see the

http://www.petropages.com

website.

Also try the Flowline Corp, in Newcastle, PA on 412.658.3711 for more info on these flanges.....


Good Luck !!!! MJC

 

[babumathan]

I am fully agree with Butelija comment and that is the normal practice to use standard ANSI B 16.5, C.S flanges with Titanium stub ends.

Cheers
Babu
PV Engineer
Singapore